Ok my 96 3.8L camaro is throwing a P0175 code, Fuel trim system rich Bank 2. Now I just installed a K&N filter with cold air arm and a Fitch fuel cansister (ita an in line fuel caytilist that gets me 2 mph better and lasts 250,000 miles) Ok now I am hoping these add ons wouldnt cause this. The code didnt come up until 3 or 4 hundred miles after I installed these. Now the car seems to run fine. What I have checked is the MAF sensor and the screen is clean. I unplugged the sensor wire and it ran rough and almost stalled but then adjusted and ran smooth. It runs smooth anyways even when plugged in. Now since I dont have the bank 1 rich code I wouldnt think it could be the MAF sensor, Canistor or diaphram or fuel pressure too high since that should effect both banks. Now I did a search for this code on this board and found that one person hear had it checked out by a GM tech and they installed an updated program for a false code P0175 coming up. Anyone hear of this. Is there a way to tell from GM with a VIN number if I had this update yet? I just bought this car a month ago. Oh and other causes I have read is an O2 sensor, well mine has 4 Cali emmissions. So if it was a sensor is should be the one on the exhaust manifold on the passenger side. If it was an O2 sensor would another code come up? Could it be the drivers side being bad causing the computer to do something wacky and making it thing the passenger side is bad? Also I read in my factory manual that it could be the injectors. Is this a common cause, is ther a way to tell if its that. I am trying to avoid going to a dealer and get it scanned to find out more because they charge $60 - $80 just to scan it. Oh and one weird thing. The first time it came on it stayed on, never going out even when you first start it. Now I erased it and it stayed out. It came on again like 150 miles later and never goes out either. Is it supposed to do that even when the engine is not warmed up yet. Does this sound like software issues (faulty code reporting) or a hard part? Thanks for any help ~ Erik

 

Anyone with any input?

 

I think there 2 possible things:
- O2 pass. side pre-cat sensor going bad
- your air filter were over-oiled, that contaminated MAF, and you probably should consider cleaning it with electric contacts cleaner

 

Yeah the pre oil was not bad. The filter was on my truck for several thousand miles before I got rid of the truck and used it on my camaro. I pretty much ruled out the MAF sensor it was also very clean when I looked at it. Today I just got my california emmissions (had to erase the code as it will not come back for about 200 miles) and I had no problem passing. The CO was very low so I think the O2 sensors are probally ok. Could they still be the problem? What do you guys think about the fuel injectors causing it or the software update I mentioned earlier. Is there a way to look up in some records if my car had it or if it even exists? Thanks ~ Erik

 

Try this and see -Tim

http://calid.gm.com/vci/VINEntryPre.do

 

Thanks for that web site. Never knew that one existed, the administrator should post that as a sticky or something. Yeah I didnt see anything that said something with a code P0175. This is what I read from a post that Bamaz28 put up.

I had the dealer service my PCM, and this is what the ticket says

"CUST STATES SHAKE/SKIP AT IDLE. SES LIGHT COMES ON. ADVISE.
RAN TECH-TWO CODE P0175 BANK 1 RUNNING RICH. FOUND NEW UPDATE
FOR PCM FOR FALSE CODE P0175. ENGINE HAS NO MISFIRES. THESE ENGINES
IDLE ROUGH SOME. REPROGRAMMED PCM AND TEST DROVE, ENGINE RUNNING AS DESIGNED, RERAN CODE P0175 PASSED."

Has anyone heard of this done before? My care doesnt shake or skip at idle but could this be my problem? I never seen anyone else talk about this software update except in this post stated? If its not the O2 sensor, which could it still be that without a code and the car passed emmissions with low CO. How about bank 2 fuel injectors? could some be bad without causeing any drivability problems and still passing emmissions? Does this software thing seem to be the most likly cause? I dont want to go to the dealer and have them charge $60 - $80 just to scan it, unless I know its the software problem that only they can fix. If its something like an O2 sensor or fuel injector I can fix myself the I would perfer to just do it and not go to them. Thanks for the help ~ Erik

 

You getting this code because PCM is unable to compensate rich condition indicated by O2 sensor with long-term fuel adjustment variable. When code is thrown, that means that long-term adjustment reached it's minimum, trying to lean out engine.
Check exhaust for leaks, check EGR. Plugs/wires are fine? You can have a slight misfire on one bank, which will cause O2 on this side register rich condition.

Answers to some of your questions:

>> If it was an O2 sensor would another code come up?
not always
>> How about bank 2 fuel injectors?
can be leaky, you can try to swap pass side with driver's side injectors
>> Software???
IMHO, highly unlikely

I was throwing simular code for another bank, when I had header gasket leak. Didn't affect drivability and I passed emissions.

 

Injectors fixed it. I went with them first since they car had 117,000 miles on it. Over 1200 miles since replacing them the code has not come back. Injectors over 100,000 miles probally should be replaced anyways to get efficency back as they are probally going to start to leak anyways.