1997 Chevrolet Astro – computer reads not ready

Dear Doctor: I have a 1997 Chevrolet Astro minivan that needs to pass state inspection, but every time I take it the computer reads not ready. It has not been ready in over a year. I have driven it hundreds of miles and still computer says not ready, I have also taken it to various mechanics and they can’t find the problem. It runs very well and has only 75,000 miles. I am the original owner. What can be the possible problem? Myrna

Dear Myrna: You have to take the van to a shop with a qualified technician who has an understanding of the computer system. All vehicles need to have all computer sensor systems in the correct parameter for the readiness monitors to set. There can be one or more pending fault codes that are causing the problem. Another common problem on some Astro minivans is a lack of communication between the emission tester and the van computer, however the van communicates with a scan tool fine. The emission tester uses a different protocol when looking for computer information.

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