oxygen sensors

Asked by mc13812 Feb 27, 2009 at 12:54 AM about the 1998 BMW 5 Series 540i Sedan RWD

Question type: Maintenance & Repair

when replacing all oxygen sensors how many miles do i have to drive as to get an emissions test done?

1 Answer
65

Josh answered 14 years ago

Only two oxygen sensors need to be replaced not all 4, 2 measure air flow and 2 monitor the cats, the ones that go bad are ones that monitor the cats. You'll be good for emissions right away. They're easy to do yourself many diy's out there, check bimmerforums. For the sensors www.oembimmerparts.com

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