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 169–192 of 2110

Most searched first

P014BO2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP014B relates to o2 sensor delayed response - lean to rich bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P014CO2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP014C relates to o2 sensor slow response - rich to lean bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P014DO2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP014D relates to o2 sensor slow response - lean to rich bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P014EO2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP014E relates to o2 sensor slow response - rich to lean bank 2 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P014FO2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP014F relates to o2 sensor slow response - lean to rich bank 2 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0150Oxygen Sensor Circuit Bank 2 Sensor 1Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0150 means Oxygen Sensor Circuit Bank 2 Sensor 1. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P015AO2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP015A relates to o2 sensor delayed response - rich to lean bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P015BO2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP015B relates to o2 sensor delayed response - lean to rich bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P015CO2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP015C relates to o2 sensor delayed response - rich to lean bank 2 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P015DO2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP015D relates to o2 sensor delayed response - lean to rich bank 2 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0195Engine Oil Temperature Sensor A CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0195 relates to engine oil temperature sensor a circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P0196Engine Oil Temperature Sensor A Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0196 relates to engine oil temperature sensor a range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P0197Engine Oil Temperature Sensor A Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0197 relates to engine oil temperature sensor a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0198Engine Oil Temperature Sensor A Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0198 relates to engine oil temperature sensor a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0199Engine Oil Temperature Sensor A Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0199 relates to engine oil temperature sensor a circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P019AO2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP019A relates to o2 sensor delayed response - rich to lean bank 1 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P019BO2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP019B relates to o2 sensor delayed response - lean to rich bank 1 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P019CO2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP019C relates to o2 sensor delayed response - rich to lean bank 2 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P019DO2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP019D relates to o2 sensor delayed response - lean to rich bank 2 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P01B9Engine Oil Temperature Sensor B CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01B9 relates to engine oil temperature sensor b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P01BAEngine Oil Temperature Sensor B Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01BA relates to engine oil temperature sensor b range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P01BBEngine Oil Temperature Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01BB relates to engine oil temperature sensor b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P01BCEngine Oil Temperature Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01BC relates to engine oil temperature sensor b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P01BDEngine Oil Temperature Sensor B Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP01BD relates to engine oil temperature sensor b circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.