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

• P0192 — Fuel Rail Pressure Sensor A Circuit Low Input (P0192): 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, weak fuel pump or clogged fuel filter.
• P0193 — P0193 — Fuel Rail Pressure Sensor A Circuit High Input. 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, faulty fuel pressure regulator.
• P0194 — P0194 — Fuel Rail Pressure Sensor A Circuit Intermittent. 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, vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator.
• P0195 — P0195 — Engine Oil Temperature Sensor Malfunction. 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, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• P0196 — P0196 — Engine Oil Temperature Sensor Range/Performance. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• P0197 — Engine Oil Temperature Sensor Low (P0197): 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.
• P0198 — OBD2 code P0198 flags a problem with the sensor and actuator circuits (engine oil temperature sensor high). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, poor ground connection, control module driver fault.
• P0199 — P0199 — Engine Oil Temperature Sensor Intermittent. 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, corroded, loose or damaged connector.
• P0200 — OBD2 code P0200 flags a problem with the fuel delivery and mixture control (injector circuit malfunction). Short, gentle driving to a shop is usually possible. Common culprits: clogged or leaking fuel injectors, vacuum or intake leaks skewing the mixture, faulty fuel rail pressure sensor or wiring.
• P0201 — Injector Circuit Malfunction - Cylinder 1 (P0201): 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, vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter.
• P0202 — Injector Circuit Malfunction - Cylinder 2 (P0202): 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 vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter, faulty fuel rail pressure sensor or wiring.
• P0203 — P0203 — Injector Circuit Malfunction - Cylinder 3. 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.
• P0204 — OBD2 code P0204 flags a problem with the fuel delivery and mixture control (injector circuit malfunction - cylinder 4). Short, gentle driving to a shop is usually possible. Common culprits: contaminated or incorrect fuel, weak fuel pump or clogged fuel filter, faulty fuel rail pressure sensor or wiring.
• P0205 — OBD2 code P0205 flags a problem with the fuel delivery and mixture control (injector circuit malfunction - cylinder 5). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, contaminated or incorrect fuel.
• P0206 — OBD2 code P0206 flags a problem with the fuel delivery and mixture control (injector circuit malfunction - cylinder 6). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel pressure regulator, faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter.
• P0207 — Injector Circuit Malfunction - Cylinder 7 (P0207): 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 vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator, contaminated or incorrect fuel.
• P0208 — OBD2 code P0208 flags a problem with the fuel delivery and mixture control (injector circuit malfunction - cylinder 8). Short, gentle driving to a shop is usually possible. Common culprits: clogged or leaking fuel injectors, vacuum or intake leaks skewing the mixture, faulty fuel rail pressure sensor or wiring.
• P0209 — Injector Circuit Malfunction - Cylinder 9 (P0209): 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 vacuum or intake leaks skewing the mixture, weak fuel pump or clogged fuel filter, contaminated or incorrect fuel.
• P020A — Cylinder 1 Injection Timing (P020A): 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, faulty sensor or actuator of the affected circuit, poor ground connection.
• P020B — P020B — Cylinder 2 Injection Timing. 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, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
• P020C — OBD2 code P020C flags a problem with the sensor and actuator circuits (cylinder 3 injection timing). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, control module driver fault, poor ground connection.
• P020D — OBD2 code P020D flags a problem with the sensor and actuator circuits (cylinder 4 injection timing). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, control module driver fault, open or shorted wiring in the circuit.
• P020E — P020E — Cylinder 5 Injection Timing. 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, blown fuse feeding the circuit, control module driver fault.
• P020F — P020F — Cylinder 6 Injection Timing. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, poor ground connection, open or shorted wiring in the circuit.