Scrolling plays a short illustrative scan of the car, highlighting powertrain, electrical, braking and emissions regions. Highlighted systems are not a diagnosis.

CarFaultIQ

Know the fault before you buy, repair, or ignore the warning light.

Enter a car, OBD code, symptom, warning light, or used-car concern — get urgency, likely causes, and what to check first.

P0420 check engine light car shakes when braking
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Vehicle coverage

Find your car by model

Pick make, model, and year window to open the strongest coverage path.

Coverage path

Choose a make, model, and supported year from the structured US/Canada vehicle database.

Browse all cars

Model coverage shortcuts

Jump into popular and image-backed model hubs after using the finder above.

Browse all cars →

Start with what you know

Pick the car, code, symptom, warning light, or buying decision that brought you here.

Browse cars →
Check model coverage Start with make, model, and year-range coverage. Search OBD code Decode a scanner code before you approve repairs. Check a warning light Amber or red, what it means and what to do next. Diagnose a symptom Noise, shake, smell, leak, stall, or shift concern. Used-car buyer checks Known issues, inspection order, recalls, and records.

The diagnostic run

From concern to the next practical check

Every CarFaultIQ page follows the same path: spot the symptom, decode the OBD code, weigh the risk, then take the right action.

  1. SymptomWhat you notice
  2. OBD codeDecode the fault
  3. RiskHow serious it is
  4. ActionWhat to do next

Lookup coverage by problem type

Real published page counts from this site. No owner-report totals, no live ranking claims.

1,660 vehicle hubs 157 fault records 12,128 OBD codes 134 symptom pages 88 warning-light pages 84 used-car warnings 34 guides 25 comparisons

Browse vehicle coverage

Published make hubs with model counts. Start broad, then drill into the model page.

Explore vehicle evidence →
Open vehicle directory →
Chevrolet 52 model hubs Ford 44 model hubs BMW 40 model hubs Toyota 39 model hubs Mercedes-Benz 35 model hubs Audi 31 model hubs Ferrari 31 model hubs Infiniti 31 model hubs Nissan 30 model hubs Kia 26 model hubs Mazda 26 model hubs Cadillac 25 model hubs Hyundai 24 model hubs Dodge 23 model hubs Volvo 23 model hubs Chrysler 21 model hubs Jaguar 21 model hubs Buick 20 model hubs

Known problem clusters already covered

Published fault records with vehicle, year-range, severity, and drive guidance where the page has it.

All fault records →

Buying a used car?

Use CarFaultIQ as the pre-purchase triage layer: find the model, check known problem years, scan for codes, and verify the boring paperwork before the test drive excitement takes over.

  1. Find model coverage
  2. Check known problem records
  3. Scan for OBD codes before purchase
  4. Verify recalls by VIN
  5. Inspect service records and walk away from missing history when the risk is high.

Models with deeper coverage

Sorted by published fault records attached to the model. This is coverage depth, not a worst-car ranking.

Nissan Rogue Nissan 9 fault pages Ford Focus Ford 8 fault pages Ford F-150 Ford 7 fault pages Honda Accord Honda 7 fault pages Honda Civic Honda 7 fault pages Hyundai Elantra Hyundai 7 fault pages

Recently updated coverage

Latest published pages by modified date. Not news, just fresh local coverage.