Subaru OBD1 Codes

Easy step by step guide on how to gather and read Subaru OBD 1 diagnostic trouble codes.

Difficulty Level - 1

Step 1 - Locate the diagnostic connector which is located near the driver’s side kick panel, most cases.

Step 2 - Next, locate the computer which is located under the dash near the driver’s side. 

Step 3 - With the ignition key in the "ON" position and the engine "OFF" connect the "read memory" connector and disconnect the "test mode" connector. The check engine light will start to blink, the first set of light blinks will be the first digit of the trouble code, there will be a short pause when the computer is going to output the second digit of the trouble code. For example; if the first set of check engine light blinks equal three and the second set of flashing check engine light equals three the code number is 33.

Step 4 - To clear trouble codes once the repairs have been made, remove the negative battery cable for 60 seconds, then reconnect.

Code Definitions

Code 11 Crank angle sensor fault

Code 12 Starter switch fault

Code 13 TDC sensor fault

Code 14 Injector no.1 fault

Code 15 Injector no.2 fault

Code 16 Injector no.3 fault

Code 21 Coolant temperature sensor faulta

Code 23 Pressure sensor fault

Code 24 ISC solenoid valve fault

Code 26 Air temperature sensor fault

Code 32 Oxygen sensor fault

Code 33 Vehicle speed sensor fault

Code 35 Purge control solenoid fault

Code 36 Ignition circuit fault

Code 41 Air/fuel ratio control system fault

Code 42 Idle switch fault

Code 43 Throttle switch fault

Code 45 Atmospheric pressure sensor fault

Code 52 Clutch switch circuit fault

Code 62 Electric load signal fault

Code 63 Blower fan switch fault

Code 65 Vacuum pressure sensor fault

Helpful Information

The ODB1 system is the first generation computer control systems on vehicles.


Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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