Fairly new here and 1 month owning a pretty nice 2003 330ci convertible.
These 2 codes popped up twice now; looking for advice as to whether look towards a vacuum leak(s) or a faulty MAF sensor?
Leaning towards the MAF because both times the codes dropped during highway speed driving (never seen them while stop / start traffic or idling)
Attached the freeze frame for this 2nd instance (data the first time was similar but I neglected to take a pic)
I am fortunate in that I am the 3rd owner, and the 2nd owner (2008 - 2018) saved every single maintenance receipt. So I know that approx 4 - 5 years ago there were some vacuum hoses replaced, and also the valve cover gasket. Don't see anything to indicate that the MAF was ever worked on / replaced.
I did peek around under the hood and the current hoses look decent (and still feel supple, not brittle) and didn't see any obvious cracks or loose fittings, etc. The engine compartment seems to have been regularly cleaned / maintained. Engine idles stable whether parked or at a stoplight (tach is level, not bouncing around; no feeling of shaking or engine shuddering under the hood). Car starts right up, hot or cold start. No stumbling or stalling. Acceleration is good through every gear; no backfire / misfires either.
I did try a can of that MAF cleaner already (hey, it was only 8 bucks, so why not give it a shot?) but still dropping those 2 codes. So, i think a 'dirty' MAF can be ruled out (brand new Air Filter BTW)... so, in my mind, either the MAF is on its way out - or there is a leak somewhere? Or any other possibility that I haven't considered as the cause of these DTCs..?
These 2 codes popped up twice now; looking for advice as to whether look towards a vacuum leak(s) or a faulty MAF sensor?
Leaning towards the MAF because both times the codes dropped during highway speed driving (never seen them while stop / start traffic or idling)
Attached the freeze frame for this 2nd instance (data the first time was similar but I neglected to take a pic)
I am fortunate in that I am the 3rd owner, and the 2nd owner (2008 - 2018) saved every single maintenance receipt. So I know that approx 4 - 5 years ago there were some vacuum hoses replaced, and also the valve cover gasket. Don't see anything to indicate that the MAF was ever worked on / replaced.
I did peek around under the hood and the current hoses look decent (and still feel supple, not brittle) and didn't see any obvious cracks or loose fittings, etc. The engine compartment seems to have been regularly cleaned / maintained. Engine idles stable whether parked or at a stoplight (tach is level, not bouncing around; no feeling of shaking or engine shuddering under the hood). Car starts right up, hot or cold start. No stumbling or stalling. Acceleration is good through every gear; no backfire / misfires either.
I did try a can of that MAF cleaner already (hey, it was only 8 bucks, so why not give it a shot?) but still dropping those 2 codes. So, i think a 'dirty' MAF can be ruled out (brand new Air Filter BTW)... so, in my mind, either the MAF is on its way out - or there is a leak somewhere? Or any other possibility that I haven't considered as the cause of these DTCs..?
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