S/V40 S40 T4 MAF problem... Apparently...
Alright, so this has been causing me problems for a while now!
So I have a 2000 S40 T4. It is coming up with an engine light and the traction control light as well. The fault code on my cheap OBD2 reader says MAF high input voltage. I have replaced the MAF with no obvious change.
This is where it gets weird. The problems are all over the place, when the light comes on it misfires really badly and had been getting worse. From originally just enough to be noticeable to now where it nearly didn't make it up a slight hill in second gear. Also only did this rarely, now can't drive more than a km or so before it does it, and it feels life it drops 2 cylinders now and wants to stall. Has stalled a few times now at idle sitting at lights as well. Also brings up that it is much worse once the car warms up and seems to be worse on a hot day or in the afternoon when the outside temp is higher.
Next part is the Thermo fans, which runs after the car is turned off, I assume that is when it gets a bit hot. Started it yesterday and ran only for probably 2 minutes and the fam wouldn't turn off, I had to disconnect the battery to stop it. Has plenty of coolant and oil, temp gauge never goes past half way...
Anyone got any clever ideas, I have plenty of spares and a parts car but no idea... Thinking of swapping the ECU out next. After that, replacing the wiring for the MAF or maybe the other way around.
This thing is a stack of fun when it works but it's becoming a problem, I need a car that works more often than it doesn't.