Honda OBD0 4-Cylinder ECU Troublecodes.    Compiled by XDEep.


0: ECU
check the ECU electrical connector. if no loose connectors are found, have the ECU diagnosed by a dealer service department or other qualified repair shop.

1: Oxygen Sensor "A" (Primary)
defective circuit or unplugged / defective sensor

2: Oxygen Sensor "B"
defective circuit or unplugged / defective sensor

3: MAP Sensor (Manifold Absolute Pressure)
defective circuit or unplugged / defective sensor

4: CKP Sensor (Crankshaft Position Sensor)
defective circuit or unplugged / defective sensor

5: MAP Sensor (Manifold Absolute Pressure)
mechanical problem / disconnected piping

6: ECT Sensor (Engine Coolant Temperature)
defective circuit or unplugged / defective sensor

7: TPS (Throttle Position Sensor)
defective circuit or unplugged / defective sensor

8: TDC Sensor (Top Dead Center)
defective circuit or unplugged / defective sensor

9: CYP Sensor (Cylinder #1 Position)
defective circuit or unplugged / defective sensor

10: IAT Sensor (Intake Air Temperature)
defective circuit or unplugged / defective sensor

12: EGR Lift Sensor (Exhaust Gas Recirculation)
check the hoses, the EGR valve lift sensor and the System EGR valve.

13: BARO Sensor (Atmospheric Pressure)
defective circuit or unplugged / defective sensor

14: IAC Valve (Idle Air Control)
defective circuit or unplugged / defective sensor

15: Ignition Output Signal
missing or defective ignition output signal

16: Fuel Injector System
defective circuit or unplugged / defective fuel injector

17: VSS (Vehicle Speed Sensor)
defective circuit or unplugged / defective sensor

19: Automatic Transmission Lock Up Control Solenoid Valve
defective circuit or unplugged / defective solenoid valve

20: Electrical Load Detector
defective circuit or unplugged / defective sensor

21: VTEC Solenoid Valve
defective circuit or unplugged / defective solenoid valve

22: VTEC Oil Pressure Switch
defective circuit or unplugged / defective oil pressure switch

23: KS (Knock Sensor)
defective circuit or unplugged / defective sensor

30: Automatic Transmission Signal: "A" / SEAF / SEFA / TMA or TMB
defective circuit or unplugged / defective sensor

31: Automatic Transmission Signal "B"
defective circuit or unplugged / defective sensor

41: Primary Oxygen Sensor - Heater
check the heater for the proper voltage signal.

43: Fuel Supply System
check the fuel pressure, fuel pressure regulator. check the oxygen sensor. also, check for vacuum leaks.

45: System Too Lean or Too Rich
malfunction in the fuel monitoring systems

48: LAF Sensor (Lean Air Fuel)
defective circuit or unplugged / defective sensor

54: CKF Sensor (Crankshaft Speed Fluctuation)
defective circuit or unplugged / defective sensor

58: TDC Sensor 2 (Top Dead Center)
defective circuit or unplugged / defective sensor

61: Oxygen Sensor, Heated - Sensor 1 (Primary)
high voltage, low voltage, or slow response

63: Oxygen Sensor, Heated - Sensor 2 (Secondary)
high voltage, low voltage, or slow response

65: Oxygen Sensor Heater (Secondary)
malfunctioning or defective oxygen sensor heater

67: Catalyst system Efficiency Below Threshold
malfunctioning or defective catalyst system

70: Automatic Transmission
malfunction with the automatic transmission controls

71: Cylinder 1 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire

72: Cylinder 2 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire

73: Cylinder 3 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire

74: Cylinder 4 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire

75: Cylinder 5 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire

76: Cylinder 6 Misfire or a Random Misfire
a condition is present that is creating a cylinder misfire

80: Exhaust Gas Recirculation
insufficient flow detected

86: ECT Sensor (Engine Coolant Temperature)
circuit range / performance problem

90: Evaporative Emission Control System
leak detected in the fuel tank area

91: Fuel Tank Pressure Sensor
low input

92: Evaporative Emission Control System
insufficient purge flow

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