how to reset the check engine light

Asked by Aug 05, 2007 at 12:20 AM about the 2002 Mazda Millenia 4 Dr S Supercharged Sedan

Question type: Maintenance & Repair

How do you reset the check engine light on a Mazda Mellenia 2002?

8 Answers

30,075

Not exactly sure how to reset the computer. I know on my car if you unhook the battery from the car and then reconnect it resets the system.

3 out of 3 people think this is helpful.
310

the light comes on when 1) the emmision excedes the 1.5 goverment standards, 2) component faliure, 3) or if the PCM can't "see" a component. so if the light is still on after a "fix" then you did not fix it, because the car will do a self test and if everything is correct then the light will turn off.

6 out of 6 people think this is helpful.
725

The light will not turn off by itself, it stores the codes for diagnosis even if the problem went away. To reset it disconnect your negative battery cable and step on the brake to make sure everything is discharged. Reconnect and it should be good, if the light comes on again, go get your codes read and you can visit MazdaWorld.org and we can help you solve the problem.

10 out of 10 people think this is helpful.
130

Sometimes Disconnecting the negative battery cable resets, but on newer cars you have to hook up a scan tool and clear the codes depending on the code that was set. some codes do not go away until so many drive cycles have completed which can take a long time. Some times that car has to run that test again and it has to pass it so many times before it goes away.

2 out of 2 people think this is helpful.
130

It could be fixed codes do not always turn off after you fix the component. the PROPER way to shut the light off is to clear the codes with a scan tool. if the light returns then it wasn't fixed.

2 out of 2 people think this is helpful.
3,105

Disconnecting the battery will not clear the codes, you need a scan tool. The ECM has an internal battery to keep the codes in case the battery gets disconnected. By the way, when the light comes on, that means your car has an emissions control issue, and that should be fixed, not cleared and ignored. Also, your car has almost 2000 different codes available, so it needs to be scanned to find the issue.

1 out of 1 people think this is helpful.
725

We are not talking about "most cars" we are talking about a Mazda Millenia in this case. I own one and know for a fact that disconnecting the battery and draining the capacitors will clear the codes the same way that clearing the codes with a code scanner would. Yes a CEL light does mean you have a problem that should be fixed but sometimes before fixing the problem you should clear the codes and see if the problem comes back and then diagnose the problem from there.

21 out of 21 people think this is helpful.

Hello, I just want to let you all know that I have a 1999 Mazda pick up truck B2500 with the engine light on. I did disconnected the negative for 20 seconds and I reconnect, turn the truck on and the engine light was gone. So it works on my truck. the guy at autozone check the code and i have a misfire, I notice that, but i will do a tuned up see if it works and the engine light doesn't turn on again.

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