How do you clear a diagnostic code on a car?

Does disconnecting battery clear codes?

Leaving the battery disconnected for about 15 minutes will ensure the vehicle systems will completely reset when you reconnect the battery. … Disconnecting the battery will clear the error codes and reset the check engine light.

How do you delete OBD codes?

Use a Code Scanner

  1. Connect the scanner to the on-board diagnostic connector (OBD-II) under your steering wheel. Turn your ignition switch to “On.” Turn off all accessories.
  2. Press the “Read” button on your scan tool to view the engine’s error codes. …
  3. Press the “Erase” button on your scanner to clear the error code.

How do I reset my diagnostic code?

Turn the Car On and Off Three Times



Some vehicles will automatically reset the trouble codes that caused the initial error after the vehicle is turned on and off three times in succession. To do this, insert your key into the ignition, turn the vehicle on for about a second, and then off for about a second.

What does clearing fault codes do?

On clearing the codes with the “Erase Codes” function, the system status changes to “Not Ready”. … Take several individual trips until the system reads the status of all the components once more. “Several trips” means you shut off the engine and start another trip each time.

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Is clearing codes bad while driving?

If your main reason for buying an inexpensive scanner is to reset the check-engine light, know this: clearing the code and turning the light off doesn’t mean your issue has gone away. … It’s possible that the warning light won’t come back on after you clear the code.

How long do you leave battery disconnected to reset ECU?

Disconnecting the battery for a short time may not do the trick because the car’s computer, or ECU, still has some current in it. Waiting for over 15 minutes after disconnecting the engine will help ensure the equipment is reset.

Can AutoZone clear codes?

Re: Clearing car “Check Engine” light If you just want to just check what the code is complaining about, AutoZone will test your car for free. They won’t clear the code, though. That could put them in a bad legal situation if the owner has problems later on. … Clearing codes is not illegal.

What happens if you disconnect the positive terminal first?

It can fall across either terminal and the car and nothing will happen. If you disconnect the positive terminal first and you drop a spanner, it is possible for it to fall across the positive terminal and any earth on the car, with spectacular and possible dangerous results.

Can you clear engine codes?

It’s easy to clear OBD2 codes without a scanner in just a few simple steps. It can be done in just a few minutes, and it won’t require any equipment, except for maybe a wrench. … Although you can clear an OBD2 code without a scanner, turning the check engine light off is not always the safest solution.

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How do you reset car sensors?

How to Reset a Car Computer

  1. Open up the hood.
  2. Remove the positive terminal cable from the battery using your pliers or wrench.
  3. Go to your fuse box in your car, and look at the diagram. …
  4. Keep the car disconnected like this for two to three minutes to clear the computer’s memory.
  5. Insert the fuse back in to the box.

Can you clear fault codes?

Yes, you can clear the codes without using a scanner.



In fact, the check engine light will turn back on in a matter of seconds if the problem still persists. Clearing the CEL is easy… fixing the cause of the problem is the tricky part!

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