The trouble codes on your 1991 Nissan Maxima indicate problems with the various sensors or valves that keep your Maxima running. When you receive a trouble code, it triggers the check engine light on the dash. You'll need to troubleshoot this problem by using a diagnostic scan tool, which is available for purchase from most auto parts stores. The scan tool can read the computer's trouble codes and tell you what's wrong with the vehicle.
Difficulty: Moderately Easy
Instructions
Things You'll Need
OBD scan tool
1
Locate the open access port for the OBD plug to the left of the fuse panel cover in the driver's side footwell.
2
Plug the OBD scan tool plug into the open access port and turn on the scan tool.
3
Turn the ignition key to the "II" position.
4
Wait for the display on the OBD scan tool to read "OK," then turn off the ignition and unplug the scan tool.
5
Access the menu options on your scan tool and scroll to the "stored codes" section of the menu. This is where all of the codes you just retrieved will be stored. Reference your Maxima's service manual to translate the codes.
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