S Sylvester Member Apr 30, 2017 #1 I re-timed my 2004 L322 Vanos engine. I'm getting an " oxygen sensor aging fault Downstream bank 1" error. I changed the O2 sensor on the passenger side post CAT. Same error. What could be the issue?
I re-timed my 2004 L322 Vanos engine. I'm getting an " oxygen sensor aging fault Downstream bank 1" error. I changed the O2 sensor on the passenger side post CAT. Same error. What could be the issue?
