Thread: catalyst converter options.
View Single Post
      03-13-2020, 07:38 PM   #7
ezaircon4jc
Major General
ezaircon4jc's Avatar
United_States
4553
Rep
5,406
Posts

Drives: 2019 540i M Sport
Join Date: Jan 2015
Location: San Diego

iTrader: (0)
I would still suspect the upstream sensor. The downstream just monitors the upstream so rarely fails. Here's a link for the upstream sensor...

https://www.fcpeuro.com/BMW-parts/53...&b=5&d=3584&v=
Appreciate 1
Quote