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 101–125 of 208
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EGR circuit malfunction
The EGR valve control circuit has an electrical fault.
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EGR valve range / performance
The EGR valve is not reaching the commanded position.
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EGR sensor A circuit low
The EGR position sensor signal is too low.
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Secondary air injection system incorrect flow
The secondary air injection is not delivering the expected airflow.
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Catalyst system efficiency below threshold — Bank 1
The downstream O2 sensor sees too little catalyst activity. Confirm the converter is really bad before replacing it.
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Catalyst efficiency below threshold — Bank 2
The bank 2 catalyst is below efficiency threshold.
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EVAP system malfunction
The evaporative system has a malfunction.
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EVAP incorrect purge flow
The EVAP purge flow is incorrect.
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Small leak in EVAP system
A small leak is detected in the fuel vapor recovery system.
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EVAP purge valve circuit malfunction
The purge valve control circuit has a fault.
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EVAP vent valve control circuit malfunction
The EVAP vent valve circuit has a fault.
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EVAP pressure sensor range / performance
The EVAP pressure reading is out of range.
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EVAP pressure sensor high input
The evaporative system pressure sensor reads too high.
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Large leak in EVAP system
A large leak is detected in the fuel vapor system.
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Very small leak in EVAP system
A very small leak is detected in the fuel vapor system.
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EVAP leak detected — fuel cap loose
A fuel cap leak is detected in the EVAP system.
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Fuel level sensor range / performance problem
The fuel level signal does not change as expected with tank level.
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Fuel level sensor circuit low input
The fuel level sensor signal is too low.
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Fuel level sensor circuit high input
The fuel level signal is out of range.
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Cooling fan relay 1 control circuit malfunction
The low-speed cooling fan relay circuit has a fault.
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EVAP purge system flow during non-purge
Vapors flowed through the purge system when it should have been closed.
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Vehicle speed sensor circuit malfunction
The ECM has no valid vehicle speed signal.
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Idle speed lower than expected
The engine idles below the expected speed.
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Idle speed higher than expected
The engine idles higher than the ECM expects.
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Idle air control circuit low input
The idle air control circuit reads too low.