RickHaleParker wrote: ↑20 Sep 2020, 20:15 Pull the ECM and clean the connectors.

I actually did that yesterday. After being unplugged from the battery for an hour or two after cleaning the check engine light was off. Came back today according to my friend.

Hello everyone. I've been working on a friend's S40 and I can't for the life of me figure out what the issue is here. The car runs absolutely fine, but I can't get these codes to go away for her to pass emissions. It's got a new MAF on it. I just have to think this many ECM codes (to no ill effect s...

Signal to high or too low, start looking for wiring and connector issues. Shorts, opens and connector issues. So would it be feasible that each of these different sensors have bad connections or does it make sense to start looking at the ECU connectors? Any good posts on doing this kind of thing? E...

Hello Everyone, I just signed up here after lurking for a while (I’m a member of the XC forums, but they don’t do non-xc’s there). Basically I’m very familiar with working on Volvo’s after working on my XC70 since I bought it. My friend brought her S40 to me to replace the leaking coolant lines. Tha...