This bulletin applies to 2013-2018 Audi A8, S6, S7, S8, RS 6, and 2014-2018 RS 7 vehicles equipped with a 4.0L engine.
The MIL may be on accompanied by DTC P209600 (post catalyst fuel trim system bank 1 too lean) and/or P209800 (post catalyst fuel trim system bank 2 too lean).
Any other DTCs regarding the oxygen sensors before the catalyst that may have been logged before or after the above DTCs should be ignored.
After performing a leakage test of the exhaust system, as part of the GFF test, the Guided Fault Finding recommends the replacement of the oxygen sensor before the catalyst...do not replace the front oxygen sensor. The internal reference duct of the oxygen sensor after the catalyst has been contaminated.
Replace the oxygen sensor after the catalyst on the affected bank only.
Ensure that the correct sensor per the GFF DTC fault memory is installed. Reference ElsaPro for the locations.
P/N OXYGEN SENSOR
4H0906262L...............O2 sensor after catalyst G130 (Bank 1)
4H0906262M.............O2 sensor after catalyst G131 (Bank 2)
