I have a Volkswagen car which has the Cat. Conv. & O2 Unsupported-Programming Error where my all 6 Monitors are unsupported. I failed the OBD test . It says OBD Communication Fail.
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Hello, it's difficult to know how to answer your question, as you have listed your vehicle as a Volvo C70 and you're saying it's a Volkswagen.
What kind of car? What are the concerns? Is it that the diagnostic monitors have not set?