93 850 GLT CAT and O2
 

Okay after failing smog horribly, I have to decide wether or not I should take it in to Volvo for a diagnostic. They want 130-150.00. The ecu is'nt showing any faults and wether or not Volvo finds the problem I get nailed for 150 bucks. I don't mind doing the work, but I need to be sure that either my O2 is bad or the cat is bad. Any ideas?

93 850 GLT CAT and O2
 

I drive a 94 Turbo but the diagnostic socket placement is the same as the 93s. I think you can use socket A2 to check the codes. (A6 is for ignition for the Fenix sys.) and then verify if they're repeating. <IMG src=smileys/smiley5.gif border="0"></P>


Have you also check all the vacuum connections and possibly a plugged flame-trap?? it would be likely to say the O2s are faulty if they haven't been changed since new.... but the cat? i doubt it.</P>


when i bought my 94 wagon used i had to replace both O2s to past the emission but ended up only the downstream one is at fault. and one vacuum fitting was borken on mine... so hopefully u can locate the problem indeed <IMG src=smileys/smiley1.gif border="0"></P>


GMech</P>