Got this yesterday on my 540:
P0170 Fuel Trim (Bank 1)
I've seen many times as people rush to replace MAF's, O2 sensors etc.
In this case, it was split rubber cap on vacuum T junction next to fuel vapor valve which caused unmetered air to confuse ECU.
P0170 Fuel Trim (Bank 1)
I've seen many times as people rush to replace MAF's, O2 sensors etc.
In this case, it was split rubber cap on vacuum T junction next to fuel vapor valve which caused unmetered air to confuse ECU.
Just a reminder that CEL may be as simple as vacuum leak.
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