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

• P2462 — OBD2 code P2462 flags a problem with the diesel particulate filter (DPF) (diesel particulate filter pressure sensor "B" circuit intermittent/erratic). Short, gentle driving to a shop is usually possible. Common culprits: faulty differential pressure or exhaust temperature sensor, engine faults producing excess soot (EGR, injectors), failed regeneration due to sensor or wiring faults.
• P2464 — OBD2 code P2464 flags a problem with the diesel particulate filter (DPF) (diesel particulate filter differential pressure too low bank 2). Short, gentle driving to a shop is usually possible. Common culprits: excessive ash loading (end of DPF life), failed regeneration due to sensor or wiring faults, faulty differential pressure or exhaust temperature sensor.
• P2465 — OBD2 code P2465 flags a problem with the diesel particulate filter (DPF) (diesel particulate filter differential pressure too high bank 2). Short, gentle driving to a shop is usually possible. Common culprits: soot-overloaded DPF from short-trip driving, engine faults producing excess soot (EGR, injectors), faulty differential pressure or exhaust temperature sensor.
• P2466 — Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 3 (P2466): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by corroded, loose or damaged connector, blown fuse feeding the circuit, poor ground connection.
• P2467 — P2467 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 3. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, corroded, loose or damaged connector, poor ground connection.
• P2468 — P2468 — Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 3. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit, corroded, loose or damaged connector.
• P2469 — Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 3 (P2469): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by open or shorted wiring in the circuit, control module driver fault, corroded, loose or damaged connector.
• P246A — OBD2 code P246A flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit intermittent/erratic bank 2 sensor 3). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit, corroded, loose or damaged connector.
• P246B — Vehicle Conditions Incorrect for Diesel Particulate Filter Regeneration (P246B): a powertrain (engine/transmission) fault affecting the diesel particulate filter (DPF). Short, gentle driving to a shop is usually possible. Most often caused by soot-overloaded DPF from short-trip driving, excessive ash loading (end of DPF life), engine faults producing excess soot (EGR, injectors).
• P246D — OBD2 code P246D flags a problem with the diesel particulate filter (DPF) (diesel particulate filter pressure sensor "A"/"B" correlation). Short, gentle driving to a shop is usually possible. Common culprits: soot-overloaded DPF from short-trip driving, failed regeneration due to sensor or wiring faults, engine faults producing excess soot (EGR, injectors).
• P246E — OBD2 code P246E flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit bank 1 sensor 4). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• P246F — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 4 (P246F): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, control module driver fault.
• P2470 — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 4 (P2470): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, poor ground connection.
• P2471 — OBD2 code P2471 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit high bank 1 sensor 4). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, poor ground connection, control module driver fault.
• P2472 — P2472 — Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 1 Sensor 4. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
• P2473 — P2473 — Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 4. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, poor ground connection.
• P2474 — P2474 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 4. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, corroded, loose or damaged connector, open or shorted wiring in the circuit.
• P2475 — OBD2 code P2475 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit low bank 2 sensor 4). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P2476 — OBD2 code P2476 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit high bank 2 sensor 4). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, control module driver fault, blown fuse feeding the circuit.
• P2477 — Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 4 (P2477): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• P2478 — Exhaust Gas Temperature Out of Range Bank 1 Sensor 1 (P2478): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by corroded, loose or damaged connector, poor ground connection, faulty sensor or actuator of the affected circuit.
• P2479 — P2479 — Exhaust Gas Temperature Out of Range Bank 1 Sensor 2. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P247A — OBD2 code P247A flags a problem with the sensor and actuator circuits (exhaust gas temperature out of range bank 1 sensor 3). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• P247B — OBD2 code P247B flags a problem with the sensor and actuator circuits (exhaust gas temperature out of range bank 1 sensor 4). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.