CEl help please

EDieter · Post by **EDieter** » Thu Jan 19, 2012 8:03 pm

Firstly I am not 100% this is the right section for my question so I'm sorry if I am in the wrong place.

I have a 2002 SXT w/ a Stage 3 Hahn Racecraft S20g Turbo, ATX.

I have 3 CEL's; P0133, P0172, and P1685.

P0133 = P1195(M) 1/1 02 Sensor Slow During Catalyst Monitor A slow switching oxygen sensor has been detected in bank 1/1 during catalyst monitor test. (was P0133)
- To me this is a totally different language, I can't begin to guess what is wrong here. Well sorta, I'm thinking the upstream (before my high flow cat?) 02 sensor is bad.

P0172 = P0172(M) 1/1 Fuel System Rich A rich air/fuel mixture has been indicated by an abnormally lean correction factor.
- Obviously I am running rich with my a/f, but with a turbo on an SXT wouldn't it read like this anyways? The only thing I can guess to drop this CEl is to buy a defouler like the one on modernperformance.com from vibrant, so the 02 sensors (both?) are further from the exhaust and they might sense a normal A/F. If that is the case would that mess anything up? If I am completely wrong someone please help me.

P1685 = P1685 Skim Invalid Key The engine controller has received an invalid key from the SKIM.
- I think this is because I left my keys in my gf's car when she went to work and I tried using my spare that the dealer gave me, but would not start my car, I think that key is a dud, or the skim in it does not work and I need to possible disconnect my battery and reset the pcm/ecu?

If I'm not even in the ballpark with this stuff please someone help me, I no longer have a garage to work on my car in so anything that needs to be done is going to a mechanic. I figure if I can pinpoint what needs to be done and minimize the shop time (save money) I will be better off. And I also need to get my car registered in freaking NJ now that I moved here so I don't have much time to pass inspection. I believe they just run the inspection off of the OBDII port and run it for a minute and use any existing CEL to check emissions, probably wrong though.

Thank you in advance for any help I may receive.

Post by **occasional demons** » Thu Jan 19, 2012 8:17 pm

IIRC, to reset the SKIM, you need to leave the ign on for a few hours with a battery charger connected. I thought there was a thread on it, but I'm not finding it.

I would put a fresh o2 sensor in, and go from there.

EDieter · Post by **EDieter** » Thu Jan 19, 2012 8:25 pm

Awesome, will do that SKIM reset, I also need to buy a new high flow cat and go somewhere ELSE this time and have them put it in my downpipe instead of cutting a section of my exhaust out and welding it in there underneath what seems to be just in front of the middle of the car. Then I will replace my 02 sensors.