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Resetting OBD1 Codes

The first rule of engagement when you see the "check engine light" in your dash panel is to get the code. As soon as you get it, write it down. Then reset your code by disconnecting the battery negative terminal for 1 minute and reconnect. You can then start the engine and take the vehicle for a quick road test of say 20-30 minutes. If the same check engine light shows up again with the same code, then THAT code is the real culprit that you have to fix.


Most domestic cars and trucks computer (from early 80s to late 90s) can be reset using the battery disconnection method above (or you can remove the ecm fuse to reset the code). However, beware of

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some imports because battery disconnection will not work and might require your vehicle computer reprogrammed by the dealer. Before doing so, please contact your dealer or you can inquire at if you are a member.

Most OBD2 codes can also use disconnecting the battery but may interfere with your accessories. Example: you might need to record your cd or audio code to reset it.

Most domestic and imported cars and trucks have its own system to retrieve the code yourself. Most of these models are made before 1995 for domestic vehicles and 1993 for imported vehicles. After that, you need a scanner to retrieve the engine fault code.

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