Need HELP: CEL P0171, P0172, P0174, P0175
#29
#30
MAY I PIGGYBACK - I HAVE THE SAME PO171 AND 174
I have similar problem. I already replaced my MAF with a brand new OEM Bosch, erased the CEL but after a few trips CEL came back. My 2004 ML350 is also getting closed to 100,000 so I replaced the plugs and wires with OEM Bosch plugs and NGK Platinum. Any recommendation? My mechanic mentioned it could be a problem in the fuel injection temperature sensor? Any idea? Thank you for your advise.