Diagnostic library

Find an OBD2 code

Search the code from your scanner, then narrow the library by system, severity, or code family.

9,253 diagnostic guides

Sort

Find codes by symptomChoose what you notice to search matching code guides.

Rough idle or shakingVibration while stopped Hard to startLong cranking or no-start Engine stallsCuts out at idle or on the road Hesitates or loses powerSlow response when accelerating Battery light is onCharging system warning Harsh gear changesDelayed or rough shifting

A symptom can have several causes. Treat matching codes as clues and follow the diagnostic checks in each guide.

Sensors & Electronics Clear all

Quick browse

Choose a vehicle system

Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

FiltersSeverity · family

Severity

All severities9253 Low priority305 Check soon8256 Urgent621

Code family

All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

Vehicle coverage

These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 1057–1080 of 2110

Most searched first

P2201NOx Sensor Circuit Range/Performance Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2201 relates to nox sensor circuit range/performance bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2202NOx Sensor Circuit Low Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2202 relates to nox sensor circuit low bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2203NOx Sensor Circuit High Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2203 relates to nox sensor circuit high bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2204NOx Sensor Circuit Intermittent Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2204 relates to nox sensor circuit intermittent bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2205NOx Sensor Heater Control Circuit/Open Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2205 relates to nox sensor heater control circuit/open bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2206NOx Sensor Heater Control Circuit Low Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2206 relates to nox sensor heater control circuit low bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2207NOx Sensor Heater Control Circuit High Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2207 relates to nox sensor heater control circuit high bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2208NOx Sensor Heater Sense Circuit Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2208 relates to nox sensor heater sense circuit bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2209NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2209 relates to nox sensor heater sense circuit range/performance bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P220ENOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP220E relates to nox sensor heater control circuit range/performance bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P220FNOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP220F relates to nox sensor heater control circuit range/performance bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2210NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2210 relates to nox sensor heater sense circuit low bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2211NOx Sensor Heater Sense Circuit High Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2211 relates to nox sensor heater sense circuit high bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2212NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2212 relates to nox sensor heater sense circuit intermittent bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2213NOx Sensor Circuit Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2213 relates to nox sensor circuit bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2214NOx Sensor Circuit Range/Performance Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2214 relates to nox sensor circuit range/performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2215NOx Sensor Circuit Low Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2215 relates to nox sensor circuit low bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2216NOx Sensor Circuit High Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2216 relates to nox sensor circuit high bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2217NOx Sensor Circuit Intermittent Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2217 relates to nox sensor circuit intermittent bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2218NOx Sensor Heater Control Circuit/Open Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2218 relates to nox sensor heater control circuit/open bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2219NOx Sensor Heater Control Circuit Low Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2219 relates to nox sensor heater control circuit low bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P221ANOx Sensor 1/2 Correlation Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP221A relates to nox sensor 1/2 correlation bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P221BNOx Sensor 1/2 Correlation Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP221B relates to nox sensor 1/2 correlation bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P221CReductant Heater B Current Too LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP221C relates to reductant heater b current too low. Check the fault conditions and vehicle-specific procedure before replacing parts.