BMW M3 2015–2016 — technical service bulletin
Bulletin 121315 · NHTSA communication 10147072 · issued Feb 1, 2015
Technical service bulletin
communication type
Electrical System
component
2015–2016
model years
4
vehicle entries
Official summary
"SUBJECT Service Engine Soon Light (MIL) ""On"" with Lean Mixture Faults Stored. The Service Engine Soon light comes on with either or both of the following faults stored in the DME memory: z 118001 - Mixture control: Fuel-air mixture too lean z 118101 - Mixture control 2: Fuel-air mixture too lean Engine operation and performance are not affected. The DME fuel-air mixture diagnosis is too sensitive to slight engine manufacturing tolerances."
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.