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

• P206C — OBD2 code P206C flags a problem with the sensor and actuator circuits (reductant quality sensor circuit low). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, corroded, loose or damaged connector.
• P206D — OBD2 code P206D flags a problem with the sensor and actuator circuits (reductant quality sensor circuit high). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P206E — OBD2 code P206E flags a problem with the sensor and actuator circuits (intake manifold tuning (IMT) valve stuck open bank 2). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, control module driver fault, faulty sensor or actuator of the affected circuit.
• P206F — OBD2 code P206F flags a problem with the sensor and actuator circuits (intake manifold tuning (IMT) valve stuck closed bank 2). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, faulty sensor or actuator of the affected circuit.
• P2070 — Intake Manifold Tuning (IMT) Valve Stuck Open Bank 1 (P2070): 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, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
• P2071 — Intake Manifold Tuning (IMT) Valve Stuck Closed Bank 1 (P2071): 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 blown fuse feeding the circuit, control module driver fault, open or shorted wiring in the circuit.
• P2072 — OBD2 code P2072 flags a problem with the throttle and intake air metering (throttle actuator control system - ice blockage). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or failed MAF/MAP sensor, dirty throttle body or stuck throttle plate, intake air leaks after the MAF sensor.
• P2074 — Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Higher Load (P2074): 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, contaminated or failed MAF/MAP sensor, faulty throttle position sensor or pedal sensor.
• P2075 — Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Bank 1 (P2075): 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, poor ground connection, corroded, loose or damaged connector.
• P2076 — Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Range/Performance Bank 1 (P2076): 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, open or shorted wiring in the circuit, poor ground connection.
• P2077 — P2077 — Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Low Bank 1. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• P2078 — Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High Bank 1 (P2078): 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 control module driver fault, poor ground connection, corroded, loose or damaged connector.
• P207A — P207A — Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Bank 2. 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, blown fuse feeding the circuit.
• P207B — P207B — Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Range/Performance Bank 2. 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.
• P207D — P207D — Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High Bank 2. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P207E — OBD2 code P207E flags a problem with the sensor and actuator circuits (intake manifold tuning (IMT) valve position sensor/switch circuit intermittent bank 2). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, faulty sensor or actuator of the affected circuit.
• P207F — OBD2 code P207F flags a problem with the sensor and actuator circuits (reductant quality performance). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit, control module driver fault.
• P2080 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1 (P2080): 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 blown fuse feeding the circuit, control module driver fault, poor ground connection.
• P2081 — OBD2 code P2081 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit intermittent bank 1 sensor 1). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P2082 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1 (P2082): 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 poor ground connection, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P2083 — P2083 — Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 1. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, control module driver fault, faulty sensor or actuator of the affected circuit.
• P2084 — P2084 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, poor ground connection, blown fuse feeding the circuit.
• P2085 — OBD2 code P2085 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit intermittent bank 1 sensor 2). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, open or shorted wiring in the circuit.
• P2086 — OBD2 code P2086 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit range/performance bank 2 sensor 2). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, open or shorted wiring in the circuit.