Thank you polskamafia mjl, erikv11 and Lee!! My visit to the salvage yard confirmed the location of the connections (for the ground wire, wiring harness clamp, and knock sensor clip) as well. On my volvo, the knock sensor clip is attached to the black plastic covering (has an accordion look to it) t...

Greetings all! Once again, I am attempting to better understand my Volvo! It has been sitting for the winter and have put it back on the road - the problem is the codes! I am still getting 505 and either a 130 or 131. When I put this on the road after reassembling the cylinder head etc. a few years ...