Sunday, June 17, 2012

Malfunction Indicator Light ON

Malfunction indicator light comes up on dash.
Its also known as check engine light.

Now when the Malfunction Indicator Light (aka Check Engine light) comes on, this is indication that there is error code stored in cars computer.The computer has monitored problem with any ogf the electrical working part of the system.The computer module has to be scanned.

BUT WHAT CAN BE THE FAULT?
 Unfortunately, there are literally 100's of parts and sensors monitored in various systems, and to take a "guess" as to which part/sensor in which system is faulty, is virtually impossible.

BUT MY CAR IS RUNNING FINE?
If you are not experiencing any drivability issues such as skipping, stalling, shifting problems, etc, then more than likely, the problem is going to lie in the EVAP (emissions) system.

BUT IN SUCH CASES,WHAT ARE MOST POSSIBLE FAULTS?
Very commonly, this could be a faulty, loose or missing fuel cap or even putting fuel in while the vehicle is running.

  • Check the cap for any cracks in the rubber o-ring on the underside. 
  • Check the fuel filler neck for any signs of chips or debris. 
  • Check under the vehicle, around the area of the fuel tank and the EVAP canister looking for any vacuum lines that have dry-rot cracks, holes or loose/missing connections. 


OK,BUT WHAT TO DO NEXT IF ALL THIS CHECKS OUT GOOD?


If these all check out fine, then the best thing to do at this point is to have the "p-codes" read from the on-board computer. The codes will tell what part is causing the problem.These p-codes are what is used as a "starting point" for the diagnosis and will tell which part/sensor in which system has the fault.

WILL MY CAR MECHANIC TELL ME WHAT IS FAULTY?
NO.There isn't a Mechanic on the planet that can tell you what is wrong with the vehicle just by "looking" at the Engine Light. Let it be any professional or local mechanic.Every single Mechanic's first course of action WILL be to obtain the p-codes. Once you get these p-codes you can more accurately and efficiently diagnose the problem and then make the repair.

ANY OTHER FREE OPTION TO RETRIEVE CODES?
YES,there is a cheaper and free option.
You can have these p-codes read FREE (except in California) at any local "big chain" part store (ie. AutoZone, PepBoys, Advanced, etc).

This details will help.
Thanks.


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