2001 ML 320 - Check engine light came on a couple of months ago. The code reader says its P0175 System Too Rich Bank 2. I cleared it out and the car ran fine until recently. Came on again, cleared it out - same code, a few miles later the light was back on. Engine seems to run fine though. Any thoughts on where I should begin the troubleshooting? Could this be an Air Mass Meter problem?

__________________
jayhawk

1st: Make sure there are no vacuum leaks. There are 1 maybe 2 hose on the intake pipe below the MAF sensor that might crack. Fuel pressure 3.7-4.1 bar. If no air leak are found and fuel pressure is good Mass Air Flow sensor is a big problem. I replace them all the time for P0170, P0173 and P0175 codes.

Thanks. I removed the MAF today and cleaned it with brake cleaner. Cleared the codes and got p0175 and p0112 which leads me to think its the MAF. CEL is off for now but I'll think I will order a new one. I noticed some new ones on ebay for $169.

__________________
jayhawk