I have a 2001 Mitsubishi Montero Limited. Head gaskets replaced. Valves done. The check engine light comes on after about 5 minutes if I let it idle. I can drive it for awhile and the light will go out but as soon as I let it sit idle the light comes back on. Idle is steady. Vehicle runs great. However, I can't get it inspected with the check engine light on. Its been to two separate garages and they can't figure it out. Help! Tired of dealing with it and need a fix.

 

Has anyone told you what codes are being saved from the check engine light?

It may be for a misfire on a certain cylinder.

 

Check to see if you have any code with check engine light on. That would more likely be the idle air control valve, or wiring. You have to test it with a certified mechanical if you are not able to fix this.

 

My cousins daughter has a 2003 Montero. She is having two problems and one is with the "check engine light". Recently, she took it too a dealer who told her there is a problem with the "daughter board". which will have to be sent to the factory. I have a 1993 Buick LeSabre and when I start in the morning the light is on, but not everyday and sometimes, it won't come on for a couple of days. I have a theory that it the guel, given the additives they put in it like ethanol. So, when I get a new supply of fuel I keep check to see if that makes a problem

 

take dash out, remove bulb. Replace dash.
No more light!

 

I have the 2002 model I just bought , I have check engine light now after driving it home. codes are for all 4 o2 sensors,Idle control motor, and they told me I need o replace the whole throttle body assembly. I took It to brakes plus here in frisco tx. they had the cheapest labor. They gave me a total of $2200 to fix the real problem which is the throttle body assembly and Idle control motor. I need some input as where I can get this done cheaper or where I may be able to buy new parts myself and do it or any less expensive direction would help thanks.

 

If it was only that simple. Check Engine Light not working = Failed inspection.

You have to do it yourself. Replacing the TB is not that difficult.