Honda Trouble Codes

Honda Trouble Codes


If you own a OBDI Acura or Honda and your check engine light is on, you need a way to check it. Because your vehicle doesn’t come with an OBDII port for you to tap into using a scan tool, you need another method to retrieve your Honda Trouble Codes. Just because you own a OBD1 Honda doesn’t mean you don’t have a diagnostic port. You can easily read your Honda trouble codes with just a single wire.

HondadlcThis is typically done by jumping the two pin blue harness that’s nearby your ECU. Once you jumper this connector you’ll see your Honda check engine light flash on and off.

You will be interpreting your Honda trouble codes through a process that will remind you of Morse code. Single digit Honda trouble codes 1-9 will be shown as individual blinks of your Honda check engine light.

Honda trouble codes 10 and up will have one long blink and several shorter blinks. Long blinks of your Honda check engine light on signify 10, while short flashes signify 1. Using this method you can easily determine the Honda Trouble Codes that are causing your issues.

Tips to read your Honda trouble codes

  • Use a small wire – Don’t shove or force a large gauge wire into the DLC port connector.
  • Be patient – There may be more than one code, so make sure to be patient.
  • Double check – Reading Honda trouble codes doesn’t take a lot of time, make sure to double check to get the code correct.

List of OBD1 Honda trouble codes

Code 0 – Engine Control Module

1 – Heated Oxygen Sensor #1 – Upstream O2

2 – Heated Oxygen Sensor #2 – Downstream O2

3 – Manifold Absolute Pressure (MAP) Sensor

4 – Crankshaft position sensor

5 – Manifold Absolute Pressure (MAP) Sensor

6 – Engine Coolant Temperature Sensor

7 – Throttle Position Sensor (TPS)

8 – Top Dead Center Position Sensor

9 – Number 1 Cylinder Position Sensor

10 – Intake Air temperature (IAT) Sensor

12 – Exhaust Gas Recirculation (EGR) Valve

13 – Barometric Pressure Sensor

14 – Idle Air Control (IAC) Valve

15 – Ignition Output Signal

16 – Fuel Injector

17 – Vehicle Speed Sensor

20 – Electrical Load Detector

21 – VTEC Electric Control Solenoid Valve

22 – VTEC Pressure Switch

23 – Knock Sensor

30 – Automatic Transmission A Signal

31 – Automatic Transmission B Signal

41 – Heated Oxygen Sensor Heater Element

43 – Fuel Supply System

45 – Fuel System Too Rich or Too Lean

48 – Lean Air / Fuel Sensor

54 – Crankshaft Speed Fluctuation Sensor

58 – Top Dead Center Position Sensor #2

61 – Primary Oxygen Sensor – Upstream O2

63 – Secondary Oxygen Sensor – Downstream O2

65 – Secondary Oxygen Sensor Heater

67 – Catalyst System Efficiency

70 – Automatic Transaxle

71 – Cylinder one or Random Misfire

72 – Cylinder two or Random Misfire

73 – Cylinder three or Random Misfire

74 – Cylinder four or Random Misfire

75 – Cylinder five or Random Misfire

76 – Cylinder six or Random Misfire

80 – Exhaust gas Recirculation Valve – EGR

86 – Engine Coolant Temperature Sensor

90 – Evaporative Emission Control System

91 – Fuel Tank Pressure Sensor

92 – Evaporative Emission Control System