Nissan OBD1 Codes Retrieval For Pre-1996 Vehicles

Nissan vehicles 1984-94 obd1 code retrieval

Nissan check engine light codes can be retrieved by accessing the engine computer usually located under the passenger seat, behind the glove box, center console or depending on the model. The computer itself stores the code and has a led light indicator in the box located in the top or side of the housing. The led light indicator could be single or double.

When activated, you have to either flick a switch or turn a screw in the computer box to start the led lights to flash after turning the key on but with engine not running.

Nissan OBD1 Decoder

Using a screw driver, turn the ignition key on and turn the screw driver fully clockwise and wait 2 seconds. Then turn the screw driver fully counter clockwise and the led light should start to flash in the computer box itself. When you have a single led light, you can read the code using this method:

Code 12 is showed by 1 long flashes followed by 2 short flashes

When you have a computer box with 2 led lights (usually a red and green light), the code can be read using this method: green led light will flash the first digit and the red led light will flash the second digit. Example: 3 flash of green and 4 flashes of red means a code 34.

Note: There are 5 different modes when accessing these codes and depending on the vehicle and model, please check with your dealer or ATS on what mode to use.

Here are some Nissan 1984-1995 popular common fault codes:

Code 11 Crank sensor angle
Code 12 Mass airflow sensor
Code 13 Engine coolant temperature sensor
Code 14 Vehicle speed sensor
Code 21 No ignition reference
Code 22 Fuel pump
Code 31 Engine control unit
Code 32 EGR sensor
Code 33 Oxygen sensor
Code 34 Knock sensor
Code 35 EGR temperature sensor
Code 43 Throttle positioner sensor
Code 45 Injector leak
Code 51 Injector circuit
Code 54 Automatic transmission signal
Code 55 No malfunction recorded

After getting your Nissan OBD1 codes, reset it first to confirm if you have a temporary or permanent codes. Temporary codes are usually erased whereas permanent (hard) codes need to be fixed before they can be erased. To erase, simply disconnect the battery negative terminal for 1-2 minutes and reconnect. Re-start engine until warmed up and get the code again. If you get the same code after the 2nd scanning, then that is a permanent code.


Sometime, permanent codes will not show up during a regular warm up period but could sometime takes a day or two of driving before the code shows up. This is true if the defective component is borderline, meaning it could work 50-50 times during operation. And if you check it when it is working half of the time, then the code won't show up.

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