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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

'97 Dodge Intrepid, Check Engine Light

Q: I have constant problems with the check engine light coming on. When it came on again, I checked the oil and it was a low. I filled it back up and the light did not go off. I disconnected the battery for a few minutes to clear the computer. When I turned the car back on, the light was still on. So I did the on/off thing to get the malfunction indicator lamp codes. The code that came up was 21. Do you know what this is? I was unable to find any info on the Internet.

A: The code your vehicle's computer is reporting (#21) is for an oxygen (O2) sensor problem. The only problem with that information is there are about 18, the last time I counted, possible failure types. What makes it more difficult is your vehicle's engine configuration could have 4 O2 sensors. (Any of which could be failing for one of 4 to 5 reasons each, depending on which sensor.) You'll have to have the dealer or area garage ask the computer for more details on why the check engine warning light is on.

 
     
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