Volkswagen GTI 2021 — technical service bulletin
Bulletin Dealer 24GW · NHTSA communication 10199223 · issued Jul 7, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2021
model years
2
vehicle entries
Official summary
In the event of a catalytic converter failure, which could negatively impact tailpipe emissions, existing diagnostics may not properly illuminate the Malfunction Indicator Light (MIL) due to an error identified with Rear O2 Sensor monitoring.
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.