To clear the confusion we need a basic understanding of what the check engine light is trying to tell us.
Check engine light went off by itself catalytic converter.
When a converter is bad or failing the rear oxygen sensor shows a lot of oxygen coming out of the converter and therefore the light comes on to show that the converter is not healthy.
It is possible for many faults to result in a check engine light that comes on intermittently.
I think what s happening is that your oxygen sensor or the catalytic converter itself is on the verge of failing.
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The powertrain control module pcm will continue to run tests even after a failure has been detected.
I needed an 02 sensor which we replaced spark plug wires and just for the heck of it we replaced the fuel filter and fuel pump because it seemed to be having some issues with fuel in our own backyard with the.
A check engine indicator is a malfunction indicator light or mil for the computer management system.
If the light goes off we assume things are okay.
So my car had a check engine light on for a year now.
A check engine light will shut itself off if the condition that caused it is remedied.
Switching the ignition on and off.
An illuminated check engine light or malfunction indicator lamp cel or mil with a catalytic converter diagnostic trouble code dtc is the most common catalytic converter problem indicator.
In this situation the check engine light will not come on to indicate catalytic converter failure because all is well.
If the test passes enough times the light will turn off.
Repeat the process three or four times and then drive a short distance to see whether the engine light goes off.
While your car is motionless turn the ignition on and off with a second lag time.
There were several things wrong with it.
Knowing if we should continue driving or stop right now is difficult.
A failed test for catalytic converter efficiency will result in a code p0420 or p0430.
Now it comes on again.
