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

• P2193 — OBD2 code P2193 flags a problem with the sensor and actuator circuits (system too lean at higher load bank 2). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• P2199 — Intake Air Temperature Sensor 1/2 Correlation (P2199): 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, intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor.
• P219B — OBD2 code P219B flags a problem with the oxygen sensor circuit (bank 2 air/fuel ratio imbalance). The car is usually drivable while you plan the repair. Common culprits: ECM signal circuit fault, blown sensor heater fuse, exhaust leak near the sensor.
• P219C — P219C — Cylinder #1 Imbalance Error. 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, blown fuse feeding the circuit, poor ground connection.
• P219D — OBD2 code P219D flags a problem with the sensor and actuator circuits (cylinder #2 imbalance error). 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.
• P219E — OBD2 code P219E flags a problem with the sensor and actuator circuits (cylinder #3 imbalance error). 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.
• P219F — Cylinder #4 Imbalance Error (P219F): 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, open or shorted wiring in the circuit, poor ground connection.
• P2200 — NOx Sensor Circuit Bank 1 (P2200): 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, open or shorted wiring in the circuit.
• P2202 — NOx Sensor Circuit Low Bank 1 (P2202): 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, faulty sensor or actuator of the affected circuit, poor ground connection.
• P2203 — OBD2 code P2203 flags a problem with the sensor and actuator circuits (nox sensor circuit high bank 1). 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, control module driver fault.
• P2204 — NOx Sensor Circuit Intermittent Bank 1 (P2204): 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, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• P2205 — NOx Sensor Heater Control Circuit/Open Bank 1 (P2205): 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, faulty sensor or actuator of the affected circuit, poor ground connection.
• P2207 — OBD2 code P2207 flags a problem with the sensor and actuator circuits (nox sensor heater control circuit high bank 1). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P2208 — OBD2 code P2208 flags a problem with the sensor and actuator circuits (nox sensor heater sense circuit bank 1). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, poor ground connection, corroded, loose or damaged connector.
• P2209 — P2209 — NOx Sensor Heater Sense Circuit Range/Performance Bank 1. 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, poor ground connection.
• P2210 — OBD2 code P2210 flags a problem with the sensor and actuator circuits (nox sensor heater sense circuit low bank 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.
• P2211 — P2211 — NOx Sensor Heater Sense Circuit High Bank 1. 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, poor ground connection, corroded, loose or damaged connector.
• P2213 — OBD2 code P2213 flags a problem with the sensor and actuator circuits (nox sensor circuit bank 2). 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, open or shorted wiring in the circuit.
• P2214 — P2214 — NOx Sensor 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: faulty sensor or actuator of the affected circuit, control module driver fault, corroded, loose or damaged connector.
• P2215 — P2215 — NOx Sensor Circuit Low Bank 2. 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.
• P2216 — P2216 — NOx Sensor Circuit High 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, poor ground connection, open or shorted wiring in the circuit.
• P2217 — P2217 — NOx Sensor Circuit Intermittent Bank 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, control module driver fault, open or shorted wiring in the circuit.
• P2218 — NOx Sensor Heater Control Circuit/Open Bank 2 (P2218): 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, open or shorted wiring in the circuit.
• P2219 — NOx Sensor Heater Control Circuit Low Bank 2 (P2219): 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, blown fuse feeding the circuit.