Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Performance DTCS
/Performance Problem P0117 (6) ECT Sensor Circuit Low Voltage Input P0118 (6) ECT Sensor Circuit High Voltage Input P0122 (7) TP Sensor Circuit Low Voltage Input P0123 (7) TP Sensor Circuit High Voltage Input P0131 (2) Primary HO2S-1 Circuit Low Voltage P0132 (2) Primary HO2S-1 Circuit High Voltage P0133 (62) Primary HO2S-1 Circuit Slow Response P0135 (42) Primary HO2S-1 Heater Circuit Malfunction P0137 (63) Secondary HO2S-2 Circuit Low Voltage P0138 (63) Secondary HO2S-2 Circuit High Voltage P0139 (63) Secondary HO2S-2 Circuit Slow Response P0141 (65) Secondary HO2S-2 Heater Circuit Malfunction P0171 (46) Fuel System Too Lean (Right Bank) P0172 (46) Fuel System Too Rich (Right Bank) P0300 (70) Random Misfire Detected P0301 (71) Cylinder No. 1 Misfire Detected P0302 (72) Cylinder No. 2 Misfire Detected P0303 (73) Cylinder No. 3 Misfire Detected P0304 (74) Cylinder No. 4 Misfire Detected P0305 (75) Cylinder No. 5 Misfire Detected P0306 (76) Cylinder No. 6 Misfire Detected P0325 (53) Right Knock Sensor (KS) Circuit Malfunction P0335 (4) Crankshaft Position (CKP) Sensor No Signal Input P0336 (4) CKP Sensor Circuit Range/Performance P0401 (80) EGR System - Insufficient Flow Detected P0420 (67) Catalyst System - Efficiency Below Threshold P0451 (91) Fuel Tank Pressure Sensor FTPS Circuit Range/Performance Problem P0452 (91) Fuel Tank Pressure Sensor FTPS Low Input P0453 (91) Fuel Tank Pressure Sensor FTPS High Input P0505 (14) Idle Control System Malfunction P0720 (70) Countershaft Speed Sensor Circuit P1106 (13) Barometric Pressure (BARO) Sensor Range/Performance Problem P1107 (13) BARO Sensor Circuit Low Voltage Input P1108 (13) BARO Sensor Circuit High Voltage Input P1121 (7) Throttle Position Lower Than Expected P1122 (7) Throttle Position Higher Than Expected P1128 (5) Manifold Absolute Pressure Lower Than Expected P1129 (5) Manifold Absolute Pressure Higher Than Expected P1259 (22) VTEC System Malfunction P1297 (20) Electrical Load Detector Circuit Low Input P1298 (20) Electrical Load Detector Circuit High Input P1361 (8) TDC Sensor No. 1 Intermittent Interruption P1362 (8) TDC Sensor No. 1 No Signal P1366 (58) TDC Sensor No. 2 Intermittent Interruption P1367 (58) TDC Sensor No. 2 No Signal P1456 (90) Evaporative Emission Control System Leak Detected (Fuel Tank System) P1457 (90) Evaporative Emission Control System Leak Detected (EVAP Contro Canister System) P1486 (87) Range/Performance Problem In Thermostat P1491 (12) EGR Valve Lift Insufficient Detected P1498 (12) EGR Valve Lift Sensor High Voltage P1519 (14) IAC Valve Circuit Failure P1607 Powertrain Control Module Internal Circuit Failure P1676 (35) FPTDR Signal Line Failure P1678 (35) FPTDR Signal Line Failure
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.