How do you reset a car’s ECU?

I’ve heard that you should reset the engine control unit after any major engine modifications. I just had my exhaust flow increased, so I should probably figure out how to reset the engine control unit. What should I do to reset my car’s ECU?

Answer
Resetting your ECU is a popular myth. In reality, resetting your engine control unit (ECU) after modifying your engine** isn’t necessary. However, resetting your ECU can help you fix a faulty check engine light or restore your car to factory setting.
If you still want to reset your ECU, follow these steps:
  • Step 1: Drive your car for about 15 minutes until it heats to its normal working temperature.
  • Step 2: Pop the hood and remove the negative lead from your car battery. Make sure the cable doesn’t touch any metal surfaces.
  • Step 3: Let the car sit for at least five minutes.
  • Step 4: Press and hold the break for at least 20 seconds.
  • Step 5: Reconnect the cable and close the hood.
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Joshua Levy
Answered on Nov 23, 2021
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