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9,253 diagnostic guides

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Find codes by symptomChoose what you notice to search matching code guides.

Rough idle or shakingVibration while stopped Hard to startLong cranking or no-start Engine stallsCuts out at idle or on the road Hesitates or loses powerSlow response when accelerating Battery light is onCharging system warning Harsh gear changesDelayed or rough shifting

A symptom can have several causes. Treat matching codes as clues and follow the diagnostic checks in each guide.

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Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

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All severities9253 Low priority305 Check soon8256 Urgent621

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All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

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These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 697–720 of 8256

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P01F4O2 Sensor Circuit Slow Response Bank 1 Sensor 4Check soonSensors & Electronics30–120 minutes for initial diagnosisP01F4 relates to o2 sensor circuit slow response bank 1 sensor 4. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F5O2 Sensor Circuit No Activity Detected Bank 1 Sensor 4Check soonSensors & Electronics30–120 minutes for initial diagnosisP01F5 relates to o2 sensor circuit no activity detected bank 1 sensor 4. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F6O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 4Check soonSensors & Electronics30–120 minutes for initial diagnosisP01F6 relates to o2 sensor signal biased/stuck lean bank 1 sensor 4. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F7O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 4Check soonSensors & Electronics30–120 minutes for initial diagnosisP01F7 relates to o2 sensor signal biased/stuck rich bank 1 sensor 4. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F8Engine Coolant Heater A Control Circuit Driver Current/Temperature Too HighCheck soonEngine Problems30–120 minutes for initial diagnosisP01F8 relates to engine coolant heater a control circuit driver current/temperature too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F9Engine Coolant Heater B Control Circuit Driver Current/Temperature Too HighCheck soonEngine Problems30–120 minutes for initial diagnosisP01F9 relates to engine coolant heater b control circuit driver current/temperature too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P01FATurbocharger Outlet Pressure Sensor B CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01FA relates to turbocharger outlet pressure sensor b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P01FBTurbocharger Outlet Pressure Sensor B Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01FB relates to turbocharger outlet pressure sensor b range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P01FCTurbocharger Outlet Pressure Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01FC relates to turbocharger outlet pressure sensor b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P01FDTurbocharger Outlet Pressure Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01FD relates to turbocharger outlet pressure sensor b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P01FETurbocharger Outlet Pressure Sensor B Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01FE relates to turbocharger outlet pressure sensor b intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P01FFTurbocharger Outlet Pressure Sensor A/B CorrelationCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01FF relates to turbocharger outlet pressure sensor a/b correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P0200Injector Circuit/OpenCheck soonFuel System45–120 minutes for initial diagnosisP0200 means Injector Circuit/Open. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0207Injector Circuit/Open Cylinder 7Check soonFuel System45–120 minutes for initial diagnosisP0207 means Injector Circuit/Open Cylinder 7. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P020ACylinder 1 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP020A relates to cylinder 1 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P020BCylinder 2 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP020B relates to cylinder 2 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P020CCylinder 3 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP020C relates to cylinder 3 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P020DCylinder 4 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP020D relates to cylinder 4 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P020ECylinder 5 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP020E relates to cylinder 5 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P020FCylinder 6 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP020F relates to cylinder 6 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021ACylinder 7 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021A relates to cylinder 7 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021BCylinder 8 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021B relates to cylinder 8 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021CCylinder 9 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021C relates to cylinder 9 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021DCylinder 10 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021D relates to cylinder 10 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.