I was wondering if you could give me your opinion about a car issue I am having. My 1997 E320 with 95k, is having a PO170 error code. It first came on a couple weeks ago and I had my mechanic look at it.
PO170 corresponds to "Fuel Trim 1" and there are a list of things this could be. For some reason Mechanic A doesn't think it's the Mass Air Flow sensor but Mechanic B does. I had a second opinion. I even brought it to AutoZone to have the code read... and sure enough it reads PO170 and he thought it could be an O2 sensor.
I've done a little research and from what I understand PO170 can be the MAF but usually it has two codes PO170 and PO173. My car is not driving abnormally. I can merge in and out of traffic and I can accelerate smoothly. Maybe my car is supposed to be more responsive and powerful? I don't know.
The second mechanic I went to practically specializes in Mercedes and his sister-in-law works with me. He mentioned that in his experience PO170 is the MAF. But, I was very concerned when it only took him 5 minutes to come to that conclusion.
Before I go to the Stdealer, I was wondering if you had any experience with this. I am frustrated with this situation because I am getting 3 different answers from 3 different good sources.
I posted this question for my nephew it is his car. Any help would be appreciated