Instant OBD-II Code Lookups & DIY Fixes

Search P/B/C/U codes for popular makes (Toyota, Honda, Ford, Chevy, Nissan, Jeep, BMW and more). Get plain-English meanings, symptoms, likely causes, verified repair steps, cost ranges, and safety tips.

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Popular searches: P0420 - Catalyst System, P0171 - System Too Lean, P0300 - Multiple Misfires | Browse OBD-II codes

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Most Common OBD Codes

Most searched diagnostic trouble codes this month

P0420
Very Common

Catalyst System Efficiency Below Threshold

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P0171
Common

System Too Lean (Bank 1)

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P0301
Common

Cylinder 1 Misfire Detected

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P0442
Common

EVAP Emission Control System Leak

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P0128
Common

Coolant Thermostat Temperature

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P0455
Common

EVAP System Large Leak Detected

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