Question about 2006 Jeep Liberty

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My check emgine light coming on

Why is my check engine light coming on

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The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

A flashing check engine light is an indication of a severe misfire or problem that is likely to harm your engine. Immediate diagnosis and service is needed.

Some specific causes for the light to be on are:
Gas cap left off, not tightened, not installed correctly, or needs to be replaced

02 sensor

Engine misfire - error might clear itself after 3 complete warm-up cycles; not restarts, but warm-ups

At start up for a bulb check - Should not stay on

Problem in the emission system, including clogged exhaust or the catalytic converter not functioning properly

Dirty/clogged air filter

Dirty MAF sensor

There are pages and pages of items that can cause a check engine light to come on. Having it checked with a scan tool will narrow down the problem area.

More comments from contributors:
Not all systems are able to be read by your local auto parts store. For '95 and earlier cars, OBD I is used and can NOT be read by AutoZone or Advanced Auto. A simple paper clip can be used to jump 2 ports on the diagnostic port and have the Engine light flash a certain sequence. This will then tell you the code to refer to for troubleshooting.

On certain Dodges, you can check the codes with the engine computer. Just turn the key on to the position just before it starts the car. then turn it off. Do this 3 times quickly. After the third time, there will be codes on the dash LED. Just copy them down and go to Google and find the codes.

Good luck (remember rated this help).

Posted on May 09, 2010


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