This can be a faulty MAF sensor as it is common to both banks. This means that your engine has too much air or not enough fuel for proper ignition. The fault code P0174 descriptor is Bank 2 running lean. The fault code P0171 descriptor is Bank 1 running lean. I have tried spraying the MAF sensor with MAF Sensor cleaner that I got from Autozone, it didn't seem to make any difference, but I possibly didn't clean it properly? I took the sensor off an sprayed it all over, let it dry, and then popped it back in. UPDATE: I wanted to add that the CEL's that came on are P0171 and P0174.
I am located in Denver Colorado, roughly mile above sea level. However, the altitude could be a factor in calculating this. Which indicates that this value should peak at about 160 g/s in a 200 horse power car. It appears that the "grams per second" is not going above 50, even when the engine is revving at 7000 rpm.ĭoes this indicate that the MAF is faulty? Is there anything else I can do to see if this really is the problem? I have taken these readings from the MAF sensor. He also said it is possibly the MAF sensor or a vacuum leak somewhere.
He said that it probably isn't the O2 sensors, since both of them are reading similar readings. I had a friend get some readings from an OBD2 scanner, which indicated that both precat O2 sensors (passenger side and driver side) had negative values. I have a Vagcom USB cable and I am trying to diagnose the MAF sensor.
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