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Clearing the Check Engine light does not repair anything - it only turns off the light and clears the error codes. The problem(s) that caused the light to occur are still going to be present and the light will probably come back on, anytime from a few minutes to a few days depending on the problem(s). What you NEED to do is to extract the error codes that come with the light and take the corrective action(s) to repair the deficiencies. That will probably make the vehicle able to pass smog checks. Of course, now that you've cleared the Check Engine light, you've also erased the error codes, so you will need to wait for it to return to get the data you need for repairs.
www.toyota-4runner.org/.../4164-check-engine-light-vsc-trac-trac-off-li... Jun 6, 2004 - I just bought it, and a few days later the check engine light, VSC TRAC, and TRAC OFF lights all came on. I took it to a dealership and was told ...
You cant just turn check engine light off. You have to hook car up to a code reader or scan tool and read trouble codes. Repair trouble codes then erase codes and if problem was repaired check engine light will turn off.
The check engine light comes on when there is a failure. If the failure is not fixed before clearing the codes than the computer turns the light back on because there is still a failure! In order for the light to stay off what ever is not working needs to be repaired. Then the codes can be cleared and the light will stay off.
What code specifically do you have. It should be a P followed by four digits (P0128).
the check engine light alerts you that there are problems. There will be a code or codes stored in the engines computer. You can retrieve these codes one of three ways.
1. call your local auto parts store. Many times they will do this for free.
2. buy an inexpensive code reader. Available just about anywhere that has an automotive department. They will start at about $50.
3. Bring it in to a shop to have a check engine light diagnostic done.
Once you know the code you can then start to focus on a repair. Once a repair is made the codes will be cleared and the check engine light will turn off. If you do not make the repairs the light will not stay off. It will continue to come on and stay on until the proper repair is made.
Once the on board computer has found a problem with the engine. It will store the problem in the computers memory as a ( Diagnostic Trouble Code ) and set the check engine Light. The computer will command the check engine light to come on and stay on at this point untill all repairs are made to the Spacific Diagnostic Trouble Codes. It will retract the check engine light to the off possition once the repairs have been made and the repairs were done correctly, and the codes half to be cleared from the computers memory after repairs are finished. Good Luck and have a good XMASS.
You will need to have engine codes pulled from vehicles computer and perform repair, before the light will go off.
Any diagnostic repair shop should be sufficient to help you. A place that specializes in engine diagnostics and engine repair.