Question about BMW 545
I have a 2000 BMW 540i and I need new O2 sensors. How many do I need and what types. I have read online that there are upstream and downstream sensors. I would also like to know where they are located and how I can install them
"Up-stream" means before the catalytic converters and are probably in the header pipe(s). The "down-stream" O2 sensors are behind the cats in the exhaust system, usually just behind them. Not the expert here on this particular car but there are probably 4 of these sensors. BMW exhaust systems are very tight on space, be careful tackling this job.
Posted on Jun 10, 2008
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Posted on Jan 02, 2017
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