OBD2 Fault Code Library

Free lookup for thousands of OBD2 trouble codes: filter by family, read short meanings, and open deeper articles. Desktop ELM327 scanner with live data and AI guidance.

OBD2 symptoms

Look up diagnostic trouble codes by what the car is doing: misfire, overheating, rough idle, a check engine light, and other common symptoms.

• Engine misfire
• Engine overheating
• Rough idle
• Check engine light
• Poor fuel economy
• Hard starting
• Engine stalling
• Catalytic converter efficiency
• Oxygen sensor fault
• EVAP leak
• Thermostat not reaching temperature
• Lean air-fuel mixture
• Rich air-fuel mixture
• EGR flow fault
• Engine knock
• Charging system
• Throttle position
• Mass airflow sensor
• Turbo underboost
• Coolant temperature sensor
• Transmission fault

• P02CC — Cylinder 1 Fuel Injector Offset Learning At Min Limit (P02CC): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by faulty fuel pressure regulator, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
• P02CD — OBD2 code P02CD flags a problem with the fuel delivery and mixture control (cylinder 1 fuel injector offset learning at max limit). Short, gentle driving to a shop is usually possible. Common culprits: weak fuel pump or clogged fuel filter, contaminated or incorrect fuel, clogged or leaking fuel injectors.
• P02CE — P02CE — Cylinder 2 Fuel Injector Offset Learning At Min Limit. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel pressure regulator, contaminated or incorrect fuel, clogged or leaking fuel injectors.
• P02CF — P02CF — Cylinder 2 Fuel Injector Offset Learning At Max Limit. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, contaminated or incorrect fuel.
• P02D0 — P02D0 — Cylinder 3 Fuel Injector Offset Learning At Min Limit. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: clogged or leaking fuel injectors, contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring.
• P02D1 — OBD2 code P02D1 flags a problem with the fuel delivery and mixture control (cylinder 3 fuel injector offset learning at max limit). Short, gentle driving to a shop is usually possible. Common culprits: clogged or leaking fuel injectors, faulty fuel pressure regulator, weak fuel pump or clogged fuel filter.
• P02D2 — OBD2 code P02D2 flags a problem with the fuel delivery and mixture control (cylinder 4 fuel injector offset learning at min limit). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring, faulty fuel pressure regulator.
• P02D3 — Cylinder 4 Fuel Injector Offset Learning At Max Limit (P02D3): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by contaminated or incorrect fuel, weak fuel pump or clogged fuel filter, vacuum or intake leaks skewing the mixture.
• P02D4 — OBD2 code P02D4 flags a problem with the fuel delivery and mixture control (cylinder 5 fuel injector offset learning at min limit). Short, gentle driving to a shop is usually possible. Common culprits: vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator, clogged or leaking fuel injectors.
• P02D5 — Cylinder 5 Fuel Injector Offset Learning At Max Limit (P02D5): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by faulty fuel pressure regulator, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.
• P02D6 — Cylinder 6 Fuel Injector Offset Learning At Min Limit (P02D6): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by faulty fuel rail pressure sensor or wiring, faulty fuel pressure regulator, vacuum or intake leaks skewing the mixture.
• P02D7 — P02D7 — Cylinder 6 Fuel Injector Offset Learning At Max Limit. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: weak fuel pump or clogged fuel filter, faulty fuel rail pressure sensor or wiring, contaminated or incorrect fuel.
• P02D8 — P02D8 — Cylinder 7 Fuel Injector Offset Learning At Min Limit. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: contaminated or incorrect fuel, vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter.
• P02D9 — OBD2 code P02D9 flags a problem with the fuel delivery and mixture control (cylinder 7 fuel injector offset learning at max limit). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, vacuum or intake leaks skewing the mixture, clogged or leaking fuel injectors.
• P02DA — Cylinder 8 Fuel Injector Offset Learning At Min Limit (P02DA): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by clogged or leaking fuel injectors, vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator.
• P02DB — Cylinder 8 Fuel Injector Offset Learning At Max Limit (P02DB): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by clogged or leaking fuel injectors, faulty fuel rail pressure sensor or wiring, faulty fuel pressure regulator.
• P02DC — OBD2 code P02DC flags a problem with the fuel delivery and mixture control (cylinder 9 fuel injector offset learning at min limit). Short, gentle driving to a shop is usually possible. Common culprits: clogged or leaking fuel injectors, faulty fuel rail pressure sensor or wiring, contaminated or incorrect fuel.
• P02DD — P02DD — Cylinder 9 Fuel Injector Offset Learning At Max Limit. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors, faulty fuel pressure regulator.
• P02DE — Cylinder 10 Fuel Injector Offset Learning At Min Limit (P02DE): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by clogged or leaking fuel injectors, contaminated or incorrect fuel, vacuum or intake leaks skewing the mixture.
• P02DF — Cylinder 10 Fuel Injector Offset Learning At Max Limit (P02DF): a powertrain (engine/transmission) fault affecting the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Most often caused by weak fuel pump or clogged fuel filter, faulty fuel rail pressure sensor or wiring, vacuum or intake leaks skewing the mixture.
• P02E0 — Diesel Intake Air Flow Control Circuit/Open (P02E0): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by contaminated or failed MAF/MAP sensor, failed electronic throttle motor, faulty throttle position sensor or pedal sensor.
• P02E1 — Diesel Intake Air Flow Control Performance (P02E1): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by dirty throttle body or stuck throttle plate, wiring or connector faults in the throttle circuit, contaminated or failed MAF/MAP sensor.
• P02E2 — Diesel Intake Air Flow Control Circuit Low (P02E2): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by intake air leaks after the MAF sensor, wiring or connector faults in the throttle circuit, faulty throttle position sensor or pedal sensor.
• P02E3 — OBD2 code P02E3 flags a problem with the throttle and intake air metering (diesel intake air flow control circuit high). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, faulty throttle position sensor or pedal sensor, wiring or connector faults in the throttle circuit.