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Question:

Why did our Check Engine and Service lights come on in our 1995 Volvo 850?

About a month ago, we got an oil change at Pep Boys, and they threw in some fuel system cleaner into the gas tank- I think it was the gunk brand. About a week or so ago, the check engine light and the service light came on. I had it checked, and the code indicated an EGR problem. I also recently noticed a faint smell of gasoline outside of the car, and in the trunk area. Now, for some reason, the check engine and service lights have gone out. Would the fuel system cleaner have caused this problem? Is it true that the EGR valves on these particular cars usually last a very long time?

Answer:

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Don't know about your particular car, but sometimes a gas cap that needs replaced can cause the service light to come on. I once took my truck in to the auto parts store to hook up to their electronic reader because the check engine light had come on, and they gave me a long printout of five or six different (expensive) things that could be wrong. My son said, buy a new gas cap and sure enough the minute I put the new gas cap on, the light went out. Worth a try.

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