p0171 lean fuel mixture or vaccum leak

gmirecords@hotmail.com · 04-30-2024, 01:18 PM

changed out engine and engine light on however engine runs perfectly no problem... can this happen when you change engines (N20)..once clearing the light comes back on in a couple days

klg22 · 04-30-2024, 05:19 PM

check for a vacuum leak. you might need a smoke machine to find it. a dirty or oil coated maf could be the problem also

04-30-2024, 01:18 PM	#1
gmirecords@hotmail.com New Member 0 Rep 8 Posts Drives: 2013 bmx x3 28i drive Join Date: Apr 2024 Location: st petersburg florida iTrader: (0)	p0171 lean fuel mixture or vaccum leak changed out engine and engine light on however engine runs perfectly no problem... can this happen when you change engines (N20)..once clearing the light comes back on in a couple days
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04-30-2024, 05:19 PM	#2
klg22 Enlisted Member 20 Rep 45 Posts Drives: Bmw x3 Join Date: Oct 2023 Location: usa iTrader: (0)	check for a vacuum leak. you might need a smoke machine to find it. a dirty or oil coated maf could be the problem also
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