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1999 E320
373 Posts
Discussion Starter · #1 ·
So I plugged in my OBD2 reader just to see if anything was wrong, and what do you know an error code was read. Its code is P0170 Fuel Trim Malfunction (Bank 1). I've searched and read a few threads about this, so I went out and bought some MAF cleaner and cleaned it- codes still there. There is no CEL light on. I went through my service records and found the following:

Fuel filter and spark plugs were replaced about 15,000 miles ago

MAF was replaced about 20,000 miles ago

Both O2 sensors (ATWC and BTWC) were replaced about 24,000 miles ago

Any ideas guys? Is this a big problem, or just an annoyance?

BTW I just found out that the previous owners had been letting the mechanic put in Havoline 5W40 Synthetic oil for every oil change. Could this be a problem? Thanks!
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