check engine light and error on diagnostic test. ?que pasa? Topic is solved

[Konk]

The check engine light came on recently on my 1996 850 wagon. It was near my service time, so off to the local indie volvo service garage.

The service went great but when he ran the diagnostic test, all the diagnostic computer showed "ERROR" and did not diagnose the problem. He told me he had never seen such a thing. He checked his diagnostic computer on ever car he had there at the shop and they all did the check properly.

What to do???? Any ideas, do I need to replace the computer (I hope not).

[Tsquared]

Negative Konk,

Your Indy has an ODBII reader that can't read the Volvo specific code that is stored in the car. I had this happen to me over the Christmas holidays with my cheap Harbor Freight reader. I took the car to my Indy that has similar results. He had a high $$ reader that would reset the service light and read most of the codes and even a few of the Volvo specific - just not the one that was stored.

I had to go to a dealer - paid $130 to find out that my O2 sensors were the problem and it would cost another $450 to replace them. Informed by stealer that both were OK individually but together they would throw the code (stealer wouldn't divulge specific code - I wouldn't let them work on it any further). I changed my O2 sensors and code cleared by itself a week latter (stealer would not clear it for the $130)

good luck,

T2