2007 S40 Various ECM codes but car runs great

NTXC · Post by **NTXC** » 19 Sep 2020, 19:18

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 somehow) have to be tied together somehow.

Post by **RickHaleParker** » 20 Sep 2020, 20:15

Pull the ECM and clean the connectors.

NTXC · Post by **NTXC** » 21 Sep 2020, 12:39

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.

Post by **RickHaleParker** » 21 Sep 2020, 20:08

You did clear the codes. They do not clear on their own.

Clean the connectors on the sensors and check the wiring.

MAF:
Short-circuit to ground in the signal cable or Open-circuit in the signal cable .

FTS:
Short-circuit to supply voltage in the signal cable or Damaged fuel temperature sensor.