Search OBD-II codes
Filter by family, system, severity, engine, fuel or manufacturer. Every row links to the full diagnostic page with causes, safety advice, checks and a guided workflow.
208 codes found
Showing 151–175 of 208
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Incorrect gear ratio
The transmission cannot achieve the expected ratio, indicating internal wear.
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Torque converter clutch circuit malfunction
The torque converter clutch circuit has a fault.
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Torque converter clutch circuit stuck off
The torque converter lock-up is not engaging, hurting economy and temperatures.
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Pressure control solenoid A electrical malfunction
The line pressure control solenoid circuit has an electrical fault.
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Shift solenoid A malfunction
Shift solenoid A circuit has an electrical fault.
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Shift solenoid A performance / stuck off
Shift solenoid A is not performing correctly.
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Shift solenoid B malfunction
Shift solenoid B circuit has an electrical fault.
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Shift solenoid B performance / stuck off
Shift solenoid B is not performing correctly.
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Shift solenoid C malfunction
Shift solenoid C circuit has an electrical fault.
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Pressure control solenoid B performance / stuck
Pressure control solenoid B is not performing correctly.
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Shift malfunction
The transmission cannot shift correctly.
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3–4 shift malfunction
The 3–4 shift is not completing correctly.
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Shift timing solenoid malfunction
The shift timing solenoid circuit has a fault.
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Up-shift / down-shift switch circuit malfunction
The manual shift switch circuit has a fault.
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Clutch pedal position switch circuit malfunction
The clutch pedal position switch circuit has a fault.
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Park / neutral position switch malfunction
The park/neutral position switch circuit has a fault.
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Transmission component slipping
A transmission component is slipping.
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OBD monitor readiness not complete
Not a fault — the monitors have not completed since the last reset.
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O2 sensor adaptation — Bank 1
BMW: bank 1 fuel adaptation out of range.
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Mass airflow sensor out of self-test range
The MAF sensor failed its self-test range, often from dirt or oiled filters.
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Long-term fuel trim bank 1 too lean
VW generic: bank 1 is running too lean for a long time.
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Oxygen sensor — bank 1, lean signal during closed loop
The engine is running lean in closed loop. Find the air or fuel issue first.
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Long-term fuel trim bank 1 too lean (also Renault/Nissan)
Long-term adaptation shows bank 1 too lean.
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Mass airflow sensor circuit range / performance
Nissan: MAF signal out of range.
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Mass airflow sensor implausible signal
The MAF reading is not plausible for the operating conditions.