{"pair":"p0420-toyota","code":"P0420","make":"TOYOTA","aliases":["SCION"],"pulled":"2026-07-18","n_records":12,"n_distinct":12,"derived_counts":{"converter":8,"cost_mentioned":3,"exhaust_leak":0,"inspection":5,"misfire":2,"oxygen_sensor":1},"notes":{"community_counts":"withheld by design — see lanes.community.counts_withheld_reason","dedup_rule":"near-identical narratives (Jaccard >= 0.60 federal / >= 0.90 community + same-author) read as one owner's case","lanes":"federal (NHTSA, counted) and community (forum/reddit/YT, shown-not-counted in the pilot) are never pooled; the top-level counts are the federal lane the money page reads","mileage":"as stated by the filer/owner; implausible odometer values are kept verbatim and treated as typos in prose","pii":"no VINs, names, or contact fields are carried; public forum author handles stay in the private raw archive, not on the page"},"schema_version":"1.5","content_inventory":{"schema_version":"content-unit-inventory-summary.v2","scope":"retained-research-corpus","observed_content_rows":2509,"document_rows_seen":204,"comment_rows_seen":2305,"duplicate_content_rows_removed":20,"minimum_unique_content_units":2489,"unique_documents":188,"unique_comments":2301,"cross_lane_document_duplicates_removed":8,"lower_bound":true,"lower_bound_reason":"forum captures retained as whole-thread documents are not split into individual forum replies, and comments were not fetched for every discovery candidate","source_manifest_sha256":"b7b9e4d0bffd1b2ae37ebdda34dae4f21429ab7836632c95d756600a864ad656","lanes":{"forum":{"unique_documents":38,"unique_comments":0,"unique_content_units_within_lane":38},"independent":{"unique_documents":4,"unique_comments":0,"unique_content_units_within_lane":4},"official":{"unique_documents":38,"unique_comments":0,"unique_content_units_within_lane":38},"reddit":{"unique_documents":82,"unique_comments":913,"unique_content_units_within_lane":995},"serp":{"unique_documents":17,"unique_comments":0,"unique_content_units_within_lane":17},"youtube":{"unique_documents":17,"unique_comments":1388,"unique_content_units_within_lane":1405}},"funnel":{"owner_discussions_reviewed":134,"owner_outcomes_annotated":134,"owner_outcomes_readable":130,"owner_outcomes_unresolved":116,"public_case_rows":16,"federal_case_rows":12}},"lanes":{"community":{"source":"public forum / Reddit / YouTube individual diagnostic or repair journeys","counted":false,"harvested":"2026-07-07","n_records":16,"n_distinct":16,"reviewed_records":134,"excluded_public_records":118,"excluded_public_reasons":{"duplicate_journey":0,"insufficient_public_evidence":1,"not_individual_case":5,"not_public":5,"outcome_not_verified":80,"pair_not_proven":27},"platforms":{"forum":5,"reddit":11},"case_roles":{"owner-case":16,"repair-case":0},"derived_counts":null,"counts_withheld_reason":"individual public cases are shown as evidence, but no aggregate percentage is computed from a self-selected discussion sample under pilot-grade extraction","bias":"public discussion records are self-selected — they are richer on what was tried, what reportedly changed, and what it cost than on incidence. A record can be an owner account or a documented repair case; neither proves fleet prevalence."},"federal":{"source":"NHTSA ODI (federal complaint database)","counted":true,"pulled":"2026-07-18","n_records":12,"n_distinct":12,"derived_counts":{"converter":8,"cost_mentioned":3,"exhaust_leak":0,"inspection":5,"misfire":2,"oxygen_sensor":1},"bias":"federal complaints are self-selected — owners file when a problem is expensive, unresolved, or felt as a safety issue, so this set skews toward bad outcomes and says nothing about how often the code sets in the first place"}},"cases":[{"id":"ODI-11235071","date":"2019-07-26","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2013 Scion Fr-S","mileage":75445,"components":["ENGINE"],"tags":["misfire"],"quote":"I HAD THE J02 RECALL PERFORMED ON FROM FEBRUARY 8TH-13TH.  1200 MILES AFTER J02 RECALL CAR RUNS SLUGGISH GOING UP CANYON.   STOP CAR AND ENGINE IS MISFIRING.","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=11235071","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-10550051","date":"2013-10-29","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2002 Toyota Avalon","mileage":191187,"components":["ENGINE AND ENGINE COOLING","ELECTRONIC STABILITY CONTROL (ESC)","ELECTRICAL SYSTEM","FUEL/PROPULSION SYSTEM"],"tags":["converter","cost_mentioned","misfire"],"quote":"WHILE DRIVING HOME ON 9/24/13 MY CHECK ENGINE LIGHT CAME ON, I DROVE RIGHT TO THE TOYOTA DEALERSHIP.  I WAS INFORMED THAT THE CATALYTIC CONVERTER SYSTEM WAS","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=10550051","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-10735783","date":"2015-07-22","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2002 Toyota Camry","mileage":244309,"components":["UNKNOWN OR OTHER"],"tags":["converter","inspection"],"quote":"7/14/2015. EVAP SYSTEM.  CHECK ENGINE CODE P0446. CANNISTER CLOGGED AND VSV AND PURGE VALVES LEAKING.  REPLACED CHARCOAL CANISTER.  MILEAGE:","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=10735783","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-11659073","date":"2025-05-05","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2007 Toyota Camry","mileage":null,"components":["SERVICE BRAKES","FUEL/PROPULSION SYSTEM","FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING"],"tags":["converter"],"quote":"ALL OF A SUDDEN, ALL OF MY WARNING LIGHTS CAME ON INCLUDING: BRAKE LIGHT, CHECK VCS SYSTEM, ABS, ALL OF THE EXCLAMATION LIGHTS, ETC.. IVE BEEN VERY DILIGENT","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=11659073","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-10639515","date":"2014-09-27","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2008 Toyota Camry Hybrid","mileage":185000,"components":["ENGINE"],"tags":["converter","cost_mentioned","inspection","oxygen_sensor"],"quote":"ALL TOYOTAS WITH 2AZFE ENGINES AND THEIR VARIANTS NEED TO BE RECALLED. THERE IS AN INHERENT PROBLEM WITH EXCESSIVE OIL CONSUMPTION DUE TO A DESIGN FLAW IN BOTH","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=10639515","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-11596407","date":"2024-06-25","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2005 Toyota Corolla","mileage":null,"components":["AIR BAGS","FUEL/PROPULSION SYSTEM","UNKNOWN OR OTHER"],"tags":["inspection"],"quote":"Unknown - The airbag light has been on for a while. Check engine light is also on, and after a few repairs/replacements of diagnosed issues the light remains.","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=11596407","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-10251467","date":"2008-12-11","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2004 Toyota Matrix","mileage":87000,"components":["ENGINE AND ENGINE COOLING:EXHAUST SYSTEM","EQUIPMENT"],"tags":["converter"],"quote":"MY 2004 TOYOTA MATRIX AT 87,000 NOW NEEDS A NEW CATALYTIC CONVERTER. THE CHECK ENGINE LIGHT CAME ON AND I TOOK IT IN TO BE DIAGNOSED. P0420 WAS THE CODE.","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=10251467","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-10359074","date":"2010-10-04","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2001 Toyota Rav4","mileage":127000,"components":["POWER TRAIN:AUTOMATIC TRANSMISSION","ELECTRICAL SYSTEM"],"tags":[],"quote":"2001 TOYOTA RAV4 ECM AND TRANSMISSION REPLACED IN MAY OF 2009. PAID OUT OF POCKET.  REPLACEMENT WAS A REBUILT TRANSMISSION INSTALLED BY DEALER (VICTORY TOYOTA","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=10359074","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-10863990","date":"2016-05-09","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2003 Toyota Sequoia","mileage":167000,"components":["ELECTRONIC STABILITY CONTROL (ESC)","ENGINE","VEHICLE SPEED CONTROL"],"tags":["converter"],"quote":"HELLO, I HAVE A 2003 TOYOTA SEQUIOA WHERE THE ENGINE LIGHT AND THE VCS LIGHTS ARE BOTH ON. I SAW ON YOUR PAGE SOME REALLY HELPFUL INFORMATION ON THIS","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=10863990","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-11718059","date":"2026-02-15","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2002 Toyota Sienna","mileage":null,"components":["ELECTRICAL SYSTEM"],"tags":["inspection"],"quote":"Dear Sir, On April 2026, I need to do the semiannual smog check. Right now, I face DTC P0420 error code and I can't pass the smog check inspection. Note that I","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=11718059","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-10850705","date":"2016-03-21","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2006 Toyota Tacoma","mileage":128000,"components":["STRUCTURE:BODY"],"tags":["converter","cost_mentioned","inspection"],"quote":"TOYOTA TACOMA LIMITED SERVICE CAMPAIGN.  I DROPPED MY TRUCK OFF IN NOVEMBER 2015 FOR A FRAME INSPECTION, I WAS THEN TOLD I COULD NOT DRIVE MY TRUCK OFF OF THE","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=10850705","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"ODI-11292428","date":"2020-01-01","source_type":"nhtsa","source_name":"NHTSA ODI complaint (federal record)","vehicle":"2009 Toyota Tacoma","mileage":94000,"components":["ENGINE"],"tags":["converter"],"quote":"CHECK ENGINE LIGHT: P0420 FAULT CODE. ALSO, THERE IS A RATTLING SOUND AND EXHAUST BACK UP TO THE PRESSURE RELEASE MOUNT WHERE THE EXHAUST CONNECTS TO THE","quote_truncated":true,"live_url":"https://api.nhtsa.gov/complaints/odinumber?odinumber=11292428","archive_url":null,"archive_date":null,"verifiability":"federal-record"},{"id":"swi-317f40ef535ab351","date":null,"source_type":"forum","source_name":"2carpros.com · forum","vehicle":"1999 Toyota Corolla","mileage":null,"tags":[],"quote":"So...he changed the coil pack, and it's all good now!","quote_truncated":false,"cost":"$400","part_numbers":[],"fixed":true,"resolution":"other-fix","resolution_status":"reported-resolution","case_role":"owner-case","symptoms":["check engine light came on"],"tried":[],"outcome_quote":"So...he changed the coil pack, and it's all good now!","source_lane":"serp-surfaced#1","live_url":"https://www.2carpros.com/questions/toyota-corolla-1999-toyota-corolla-check-engine-light-p0420-catalyst-bel","archive_url":"http://web.archive.org/web/20230929102652/https://www.2carpros.com/questions/toyota-corolla-1999-toyota-corolla-check-engine-light-p0420-catalyst-bel","archive_date":"2023-09-29","verifiability":"archived"},{"id":"swi-2eae4deef67b3cb9","date":null,"source_type":"forum","source_name":"4runners.com · forum","vehicle":"2007 Toyota 4Runner","mileage":null,"tags":["oxygen_sensor"],"quote":"Hello, I recently purchased a 2007 4runner SR5, V6 with about 180,000 miles. This is my first 4Runner and I like it a lot. But I'm also getting some DTC codes","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["P0420 code","P0430 code"],"tried":["dealer replaced Bank 1 O2 sensor 2"],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.4runners.com/threads/p0420-and-p0430-code-questions.8382/","archive_url":"http://web.archive.org/web/20250713155136/https://www.4runners.com/threads/p0420-and-p0430-code-questions.8382/","archive_date":"2025-07-13","verifiability":"archived"},{"id":"swi-595020c6d1c8bb90","date":null,"source_type":"forum","source_name":"priuschat.com · forum","vehicle":"2006 Toyota Prius","mileage":282,"tags":["converter"],"quote":"My 282k miles 2006 Toyota Prius is throwing code P0420 and I want to check what could be the culprit. Indeed changing the catalytic converter probably will","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["P0420 code"],"tried":[],"outcome_quote":null,"source_lane":"native","live_url":"https://priuschat.com/threads/p0420-how-to-diagnose-origin-of-problem.162338/","archive_url":"https://web.archive.org/web/20260727003402/https://priuschat.com/threads/p0420-how-to-diagnose-origin-of-problem.162338/","archive_date":"2026-07-27","verifiability":"archived"},{"id":"swi-be86bb1eef5a1fed","date":null,"source_type":"forum","source_name":"priuschat.com · forum","vehicle":"2008 Toyota Prius","mileage":35,"tags":["converter","cost_mentioned"],"quote":"So I went on ebay and found a company from Canada (First Choice Exhausts). Their 2nd Generation cat went for $108, plus $9.99 shipping and freaking 8% tax for","quote_truncated":true,"cost":"$128","part_numbers":[],"fixed":false,"resolution":"aftermarket-converter-failed","resolution_status":"failed-repair","case_role":"owner-case","symptoms":[],"tried":[],"outcome_quote":"So I went on ebay and found a company from Canada (First Choice Exhausts). Their 2nd Generation cat went for $108, plus $9.99 shipping and freaking 8% tax for","source_lane":"serp-surfaced#1","live_url":"https://priuschat.com/threads/p0420-code-solved.214832/","archive_url":"https://web.archive.org/web/20260727003537/https://priuschat.com/threads/p0420-code-solved.214832/","archive_date":"2026-07-27","verifiability":"archived"},{"id":"swi-9ceba263521e57e3","date":"2023-07-02","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2007 toyota camry","mileage":null,"tags":["oxygen_sensor"],"quote":"O2 sensor was replaced (code went away) and drove the car for a month no code. Now all the sudden the code has come back","quote_truncated":false,"cost":null,"part_numbers":[],"fixed":false,"resolution":"returned-after-repair","resolution_status":"failed-repair","case_role":"owner-case","symptoms":[],"tried":[],"outcome_quote":"O2 sensor was replaced (code went away) and drove the car for a month no code. Now all the sudden the code has come back","source_lane":"serp-surfaced#1","live_url":"https://www.reddit.com/r/Toyota/comments/14ob9xo/keep_getting_p0420_code/","archive_url":"http://web.archive.org/web/20250331110434/https://www.reddit.com/r/Toyota/comments/14ob9xo/keep_getting_p0420_code/","archive_date":"2025-03-31","verifiability":"archived"},{"id":"swi-c824720ba1af6aff","date":"2024-09-28","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2002 Toyota Sequoia","mileage":null,"tags":["misfire"],"quote":"I have a 2002 Toyota Sequoia that has had a P0420 for about 6 months. The radiator cracked and started smoking about 1 year ago. It had a bad misfire right","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["bad misfire"],"tried":[],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.reddit.com/r/toyotasequoia/comments/1fr3d4y/toyota_p0420/","archive_url":"http://web.archive.org/web/20250802184449/https://www.reddit.com/r/toyotasequoia/comments/1fr3d4y/toyota_p0420/","archive_date":"2025-08-02","verifiability":"archived"},{"id":"swi-93b5bf1a0430b537","date":"2025-04-17","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2011 Toyota Matrix","mileage":null,"tags":[],"quote":"Our 2011 Toyota Matrix with the 1.8L with over 300,000km or 182,000 miles. It's been giving us some issues starting and rough idle. It gave us a P0300 code so","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["rough idle","P0300 code","P0301 code","P0302 code","P0420 code"],"tried":["Replaced plugs"],"outcome_quote":null,"source_lane":"native","live_url":"https://www.reddit.com/r/MechanicAdvice/comments/1k1iter/2011_toyota_matrix_throwing_p0300_p0301_and_now/","archive_url":"http://web.archive.org/web/20250531185515/https://www.reddit.com/r/MechanicAdvice/comments/1k1iter/2011_toyota_matrix_throwing_p0300_p0301_and_now/","archive_date":"2025-05-31","verifiability":"archived"},{"id":"swi-2e5f0510993e5263","date":"2025-08-23","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2003 Toyota corolla","mileage":null,"tags":["oxygen_sensor"],"quote":"I had a P0420 code show up on my 2003 Toyota corolla. I checked the live data using a obd scanner to see if its the oxygen sensors. The bank1 sensor1 were","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["P0420 code"],"tried":[],"outcome_quote":null,"source_lane":"native","live_url":"https://www.reddit.com/r/toyotacorolla/comments/1mxracz/p0420_code_2003_toyota_corolla_le/","archive_url":"https://web.archive.org/web/20260727003329/https://www.reddit.com/r/toyotacorolla/comments/1mxracz/p0420_code_2003_toyota_corolla_le/","archive_date":"2026-07-27","verifiability":"archived"},{"id":"swi-622d2ca50fe8c69c","date":"2026-02-28","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"Toyota","mileage":240,"tags":["converter"],"quote":"Hello, I have a code for the catalytic converter p0420 and p2423 (Toyota hcac). I know the cat is probably bad but I want to make sure before buying a new","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["240k miles"],"tried":[],"outcome_quote":null,"source_lane":"native","live_url":"https://www.reddit.com/r/AskAMechanic/comments/1rh7rzv/2006_toyota_camry_4_cylinder_p0420_code/","archive_url":"https://web.archive.org/web/20260727003507/https://www.reddit.com/r/AskAMechanic/comments/1rh7rzv/2006_toyota_camry_4_cylinder_p0420_code/","archive_date":"2026-07-27","verifiability":"archived"},{"id":"swi-aae8b9e9b63dd858","date":"2014-11-04","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2004 Toyota Prius","mileage":null,"tags":["converter"],"quote":"2004 Toyota Prius. We had the check engine light come on. Took it to the shop to get the codes read. The code was \"P0420 - Catalyst System Efficiency Below","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["no other outward symptoms"],"tried":[],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.reddit.com/r/MechanicAdvice/comments/2lb0u1/code_p0420_catalyst_system_efficiency_below/","archive_url":"http://web.archive.org/web/20250331111339/https://www.reddit.com/r/MechanicAdvice/comments/2lb0u1/code_p0420_catalyst_system_efficiency_below/","archive_date":"2025-03-31","verifiability":"archived"},{"id":"swi-14d6572b537fabc1","date":"2015-11-21","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2003 Toyota Matrix","mileage":230,"tags":["oxygen_sensor"],"quote":"A couple of weeks back, after getting a P0141 code (this was the only code at the time), I replaced the oxygen sensor on my 2003 Toyota Matrix. I drove it for","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":[],"tried":[],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.reddit.com/r/Cartalk/comments/3tmvfy/2003_toyota_matrixreplaced_oxygen_sensor_p0141/","archive_url":"http://web.archive.org/web/20230604195100/https://www.reddit.com/r/Cartalk/comments/3tmvfy/2003_toyota_matrixreplaced_oxygen_sensor_p0141/","archive_date":"2023-06-04","verifiability":"archived"},{"id":"swi-51e6b2a2f55ba2c7","date":"2017-07-25","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2005 Toyota Camry","mileage":null,"tags":["converter","oxygen_sensor"],"quote":"Hello, I'm trying to test my vehicle for faulty o2 sensors before thinking of replacing the catalytic converter. I rev the warmed up engine at 2,500 rpm for 20","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":[],"tried":[],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.reddit.com/r/Toyota/comments/6pheht/toyota_camry_24_le_2005_with_p0420_code_help_me/","archive_url":"http://web.archive.org/web/20250306181132/https://www.reddit.com/r/Toyota/comments/6pheht/toyota_camry_24_le_2005_with_p0420_code_help_me/","archive_date":"2025-03-06","verifiability":"archived"},{"id":"swi-18aa06c1e003a694","date":"2021-02-22","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2003 Toyota Matrix","mileage":null,"tags":["converter"],"quote":"I have a 2003 Toyota Matrix XR. She is throwing a P0420 code when scanned. The cat is not clogged...she accelerates just fine and loses no power going up","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["P0420 code"],"tried":[],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.reddit.com/r/MechanicAdvice/comments/lpavzb/p0420_code_03_toyota_matrix_xr_how_can_i_tell/","archive_url":"http://web.archive.org/web/20250303024349/https://www.reddit.com/r/MechanicAdvice/comments/lpavzb/p0420_code_03_toyota_matrix_xr_how_can_i_tell/","archive_date":"2025-03-03","verifiability":"archived"},{"id":"swi-b5e980500b125b4b","date":"2021-04-26","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"Toyota","mileage":null,"tags":["oxygen_sensor"],"quote":"Back again with this car that refuses to be happy. First I had a P2238 error, and replaced the Bank 1 Sensor 1 O2 sensor. Then I had a P0174 code, and turns","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["P0420 code"],"tried":[],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.reddit.com/r/MechanicAdvice/comments/myo149/2004_toyota_sienna_p0420/","archive_url":"http://web.archive.org/web/20210426025635/https://www.reddit.com/r/MechanicAdvice/comments/myo149/2004_toyota_sienna_p0420/","archive_date":"2021-04-26","verifiability":"archived"},{"id":"swi-9894ce1454461cbc","date":"2022-06-06","source_type":"reddit","source_name":"reddit.com · reddit","vehicle":"2007 Toyota Prius","mileage":150,"tags":[],"quote":"I have a Toyota Prius 2007 model and I got a check engine light recently. Went to autoZone and the dude diagnosed it as a P0420 code, which is related to a bad","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":["check engine light","P0420 code"],"tried":[],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.reddit.com/r/prius/comments/v6f08p/got_a_p0420_check_engine_light_what_does_it_mean/","archive_url":"http://web.archive.org/web/20250301004240/https://www.reddit.com/r/prius/comments/v6f08p/got_a_p0420_check_engine_light_what_does_it_mean/","archive_date":"2025-03-01","verifiability":"archived"},{"id":"swi-2187245dad44280b","date":null,"source_type":"forum","source_name":"toyotanation.com · forum","vehicle":"2003 Toyota Camry","mileage":null,"tags":[],"quote":"Hello all- Posted this under the Gen 3 & 4 forums accidentally, sorry for the redundancy, but wanted to get it in the right forum. Just last night, my 2003","quote_truncated":true,"cost":null,"part_numbers":[],"fixed":false,"resolution":"unresolved","resolution_status":"unresolved","case_role":"owner-case","symptoms":[],"tried":[],"outcome_quote":null,"source_lane":"serp-surfaced#1","live_url":"https://www.toyotanation.com/threads/2003-camry-4-cyl-p0420-code-scenario-associated-with-possible-causes.329901/","archive_url":"http://web.archive.org/web/20260727003122/https://www.toyotanation.com/threads/2003-camry-4-cyl-p0420-code-scenario-associated-with-possible-causes.329901/","archive_date":"2026-07-27","verifiability":"archived"}]}