Engine Codes - 11 signals they may try to give you

Car panel view

OBD-II in other word “On board diagnostics” is the car’s self-diagnostics system which helps maintenance technicians to identify the problem easily and quickly figure out where to look at. Generally, as there are lots of subsystems in cars when check engine light is on, it won’t be easy task to identify the reason of check engine light flashing. As a result, without OBD system it would be non-ending and impossible mission to identify the root cause. So below given are the engine codes produced by OBD-II system during 10 main possible causes of check engine light flashing.

1) Low Quality Fuel

Engine codes for Fuel Composition Sensor Circuit Malfunction

  • P0176, P0177, P0178, 0179

Engine codes for Fuel Temperature Sensor Malfunction

  • P0180, P0181, P0182, P0183, P0184, P0185, P0186, P0187, P0188, P0189

2) Loose Gasoline Cap

Engine codes for Evaporative Emission Control System malfunctions where the reason for check engine flashing could be loose gasoline cap

  • P0440, P0441, P0442, P0443, P0444, P0445, P0446, P0447, P0448, P0449, P0450, P0451, P0452, P0453, P0454, P0455

3) Fault of High Voltage Wires

No specific Engine codes for identifying faulty High Voltage Wires

4) Faulty Spark Plugs

Engine codes for Fuel Trim Malfunction Banks, System Too Lean Banks, System Too Rich Banks

  • P0170, P0171, P0172, P0173, P0174, P0175

Engine codes for Misfire Detection

  • P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0309, P0310, P0311, P0312

5) Under-performing ignition coil

Engine codes for Misfire Detection

  • P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0309, P0310, P0311, P0312

Engine codes for Ignition Coil Primary/Secondary Circuit Malfunction

  • P0350, P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358, P0359, P0360, P0361, P0362

6) Fault of Oxygen Sensor

Engine codes for Intake Air Temperature Circuit Malfunctions

  • P0110, P0111, P0112, P0114

Engine codes for O2 Sensor Circuit Malfunctions

  • P0131, P0137, P0143, P0151, P0157, P0163-O2 Sensor Circuit Low Voltage

  • P0132, P0138, P0144, P0152, P0158, P0164-O2 Sensor Circuit High Voltage

  • P0133, P0139, P0145, P0153, P0159, P0165-O2 Sensor Circuit Slow Response

  • P0134, P0140, P0146, P0154, P0160, P0166-O2 Sensor Circuit No Activity Detected

  • P0135, P0141, P0147, P0155, P0161, P0167-O2 Sensor Heater Circuit Malfunction

  • P0130, P0136, P0142, P0150, P0156, P0162-O2 Sensor Circuit Malfunction

Engine codes for Fuel Trim Malfunction Banks, System Too Lean Banks, System Too Rich Banks

  • P0170, P0171, P0172, P0173, P0174, P0175

7) Fault of Catalyst Converter

Engine codes for Exhaust Gas system

  • P0400 Exhaust Gas Recirculation Flow Malfunction

  • P0401 Exhaust Gas Recirculation Flow Insufficient Detection

  • P0402 Exhaust Gas Recirculation Flow Excessive Detection

  • P0403 Exhaust Gas Recirculation Circuit Malfunction

  • P0404 Exhaust Gas Recirculation Circuit Range/Performance

  • P0405, P0406, P0407, P0408 Exhaust Gas Recirculation Circuit Low/High

  • P0420, P0430 Catalyst System Efficiency Below Threshold

  • P0421, P0431 Warm Up Catalyst Efficiency Below Threshold

  • P0422, P0432 Main Catalyst Efficiency Below Threshold

  • P0423, P0433 Heated Catalyst Efficiency Below Threshold

  • P0424, P0434 Heated Catalyst Temperature Below Threshold

8) Dirty Fuel Injectors

Engine codes for Fuel Trim Malfunction Banks, System Too Lean Banks, System Too Rich Banks

  • P0170, P0171, P0172, P0173, P0174, P0175

Engine codes for Injector Circuit Malfunctions

  • P0200, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0209, P0210, P0211, P0212

Engine codes for Cylinder Injector Circuit Low

  • P0261, P0264, P0267, P0270, P0273, P0276, P0279, P0282, P0285, P0288, P0291, P0294

Engine codes for Cylinder Injector Circuit High

  • P0262, P0265, P0268, P0271, P0274, P0277, P0280, P0283, P0286, P0289, P0292, P0295

Engine codes for Cylinder Contribution/Balance Fault

  • P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284, P0287, P0290, P0293, P0296

Engine codes for other Injector related malfunctions

  • P0213, P0214 Cold Start Injector Malfunction

  • P0215 Injection Pump Control Circuit Malfunction

  • P0216 Injection Timing control circuit malfunction

9) Problem with Fuel Pump and Filter

Engine codes for Fuel Pump and Filter malfunctions

  • P0190 Fuel Rail Pressure Sensor Circuit Malfunction

  • P0191 Fuel Rail Pressure Sensor Circuit Range/Performance

  • P0192 Fuel Rail Pressure Sensor Circuit Low Input

  • P0193 Fuel Rail Pressure Sensor Circuit High Input

  • P0194 Fuel Rail Pressure Sensor Circuit Intermittent

  • P0230 Fuel Pump Primary Circuit Malfunction

  • P0231 Fuel Pump Secondary Circuit Low

  • P0232 Fuel Pump Secondary Circuit High

10) Fault of Mass Air Flow Sensor

Engine codes for Mass Air Flow malfunctions

  • P0100 Mass Air flow sensor,

  • P0101 Mass or Volume Air Flow Circuit Range/Performance Problem

  • P0102 Mass or Volume Air Flow Circuit Low Input

  • P0103 Mass or Volume Air Flow Circuit High Input

  • P0104 Mass or Volume Air Flow Circuit Intermittent

11) Miscellaneous Engine codes causing Check engine light flashing

  • P0115, P0116, P0117, P0118, P0119 Engine Coolant Temperature

  • P0125 Engine coolant temperature

  • P0120, P0121, P0122, P0123, P0124 Throttle/Petal Position Sensor/Switch Malfunction

  • P0195, P0196, P0197, P0198, P0199 Engine Oil temperature

  • P0217 Engine over Temperature Condition

  • P0218 Transmission oil temperature

  • P0219 Engine over Speed Condition

Go to Check engine light article to read more about engine related issues and troubleshooting.

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