I have a 04 Mach 1. I put a cold air package put on it and the check engine light is on. Two codes came up, P0172 and P0175. Says the system is too rich in bank 1 and bank 2. Is the sensor bad and needs to be replaced? I have reset the codes, but they still come back.

 

It is coming back to the sensors. I would say that they are probably bad, but the problem is that it happened after the CAI install. I would double check to make sure you hooked everything back up and maybe that the MAF isn't giving the computer a reason to run it rich.

 

make sure you did not over oil the air filter, the maf ends up getting contaminated when you do and can cause this problem

 

So you think if I clean the filter, take the sensor off and make sure there is nothing on it and use my tuner to clear the codes, you think this may work? If that doesn't work, do you think I should try another sensor or just go to a Ford place and have them check it? Thanks for the information!