Check Engine Light Diagnosis

I will use an example that has been showing up over and over again and has been going on for years. Both small automotive repair shops and large dealerships have profited immensely from this computerized blunder. This is what happens. A person goes to the gas station and fills the tank but accidentally while leaving doesn't tighten the gas cap all the way tight.Stay with me here because this is what happens with your vehicles on board computer. The gas tank has a sensor installed to monitor any hydrocarbon "gas fume" leakage. This sensor senses the pressure in your tank and reports back to this computer that there is a leak into the atmosphere and tells the onboard computer. "Hey Look We're Polluting the Atmosphere!" Usually Code P0440.

This doesn't happen when you first leave the gas station, in fact it may take quite a while, and we call that 2 trip logic which is another topic all together. So after the computer gets this low pressure signal twice it sets off that ever costly to repair engine light. It shouldn't be that way but often is.

Now you should get your check engine light checked right away as it could be more serious, some people go to automotive parts store because most of them will scan your vehicle for around $20 and clear the code. A big plus and time saver if something like the loose gas cap was to blame. You can buy a generic scanner for somewhere between $60 - $100 and retrieve your own codes. Once you get the code just type the number in Google Search and I assure you there will be a wealth of knowledge on the subject. So the moral of the story is that things aren't always as bad as they seem and sometimes it's as easy as tightening your gas cap.

I don't recommend disconnecting the negative battery cable as this "Makes the light go away!" and also erases the computers adaptive memory. This will affect the adaptive memory of the computer for optimal engine performance bringing it back to factory settings. Not good. Remember always be careful when your told your vehicle needs a major repair and get a second opinion.

Please visit http://www.freeasestudyguides.com for more information on vehicle repair diagnosis.

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