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Popular searches: P0420, P0171, P0301
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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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