BMW Z4 2009–2013 — technical service bulletin
Bulletin 122011 · NHTSA communication 10162421 · issued Jul 10, 2019
Technical service bulletin
communication type
Electrical System
component
2009–2013
model years
5
vehicle entries
Official summary
N54, N54T - Catalytic Converter Conversion Faults Stored. The Service Engine Soon (MIL) lamp could come on with one or both of the following faults stored in the DME: * 29F4: catalytic converter conversion - bank 1 * 29F5: catalytic converter conversion - bank 2 DME software diagnostic error.
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.