ok guys, today, 10 days before I have to renew my tag (and get my FIRST emission inspection since buying my car in March, I got my SECOND CEL.

First time, as an APP sensor.

Today, it was business as usual, until I looked down and saw my CEL light.

This was my reaction:



So far, I've read that it could be anything from shitty gas to a valve adjustment.. Does my 2004 auto TL have a MAF sensor, and if so, should I try to clean it first?

If it's a "lazy O2 sensor", how do you replace it?

 

No MAF's for us. Google says its the #2 bank (so the rear one) and it's probably the primary or top one. Once you get to it, it's not too hard to replace with an adjustable wrench.

 

what isn't hard to replace? the bank? what is a bank? where is it located on my car? sorry, Im a noob

 

negative, bank 2 is the front. Bank 1 is on the head with cylinder 1 (rear).

 

my friend is a mechanic and he says this is a problem with my cat... is this real life?

 

99% sure it's not the cat...

Are you sure there were no other codes in addition to P0174?

First thing I'd to is reset the code and see if you get another MIL. If you get another MIL, get the codes read again (Autozone will do it for free and give you print outs).

Here's the Service Manual info:

 

Thank you kind sir.

The CEL went away on it's own. Car is driving fine. I filled up with better quality gas, thought that might have been a factor. I shall do an ECU reset next.

 

Slight bump here....have this code with my newly purchased CPO'd 07' TL-S. I believe this is covered, but in the CPO warranty it mentions that O2 sensors are NOT covered. Is it possible for the O2 sensor(s) to become fouled due to these bank/fuel system issues? Just trying to cover my basis before I do battle with the dealership.

 

Yes, I do believe O2 sensors can fail due to unfavorable fuel conditions occuring in the respective bank. If the dealership finds other faulty sensors that deal with A/F ratio then it shouldn't be hard to argue your case.

 

code back on, same problem. is there a DIY to replace my 02 sensor, and how much should I spend for the part?

 

herp derp O2 sensor herp derp

 

Hi, did you ever figure out what was causing the P0174 code? My 06 just threw that code today. I cleared it hoping it wouldn't come back. Maybe it's fuel related. I just refueled a day ago. The temperature also dropped down to 7 degrees F this morning.

 

hey guys my 06 just threw codes for p2138 which i just changed in like october, p0174, abs 61-1,83-1,86-1.not to sure what to do any help?

 

nvm it was the gas cap.

 

There is a TSB for this. It states that the PCM system needs to be updated. I recently took my car to the dealership to get timing belt serviced and it was $60 to have it done for me. Outdated PCM system causes vehicle to run lean. This may be your issue