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why do check engine light comes on

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16y ago

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What to do when check engine and trac light comes on a 2001 Lexus es 300?

Have the ECU scanned with an OBD2 scan tool.


Why is the check engine light on a 2003 Lexus es on?

The Check Engine Light comes on when the ECU has detected a problem with the emissions system. Have the ECU scanned with an OBD2 scanner to retrieve the code that has been set. That code will tell you where to start looking for the problem.


1993 Lexus ls400 lack of power check engine light on affects ac and tranni?

Looking for Lexus ES300 engine 1993


My 1992 Lexus LS 400 trac light comes on frequently also the check engine light comes on occasionally too. So far no issues as the car runs fine. What might be the cause or issue?

There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.


Is the engine check light supposed to turn on after changing radiator?

No, the check engine light comes on when the computer detects a malfunction and sets a code.No, the check engine light comes on when the computer detects a malfunction and sets a code.


1998 ford explorer check engine light?

The check engine light is the light shaped like an engine, or the light that states Check Engine (Soon). If this light comes on, it is time to see what the issue is with the engine.


Why your truck 2000 5.9 cummins has the engine protection light on?

The check engine light comes on when the computer detects a malfunction and sets a code.The check engine light comes on when the computer detects a malfunction and sets a code.


Would replacing an exhaust cause the check engine light to come on?

Maybe, the check engine light comes on when the computer detects a malfunction and sets a code.Maybe, the check engine light comes on when the computer detects a malfunction and sets a code.


Check engine light won't come on?

If an check engine light does not come on it is a good thing. When your check engine light comes on, it means you need service done on your vehicle.


What do you do if the check engine light comes back on after replacing the speed sensor?

I had all sensors replaced in my 03 Trailblazer and the check engine light stiil comes on. Why?


What does it mean if the transmission temperature light comes on after the check engine light comes on?

A low battery can cause the electrical system to flash check engine lights


Why does a 91 chevy camaro check engine light comes on?

The check engine light comes on at start up for a bulb check. If it stays on with the engine running the computer has detected a malfunction. You need to have it checked for codes.

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