Oxygen Sensor
03-19-2012, 08:12 AM
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My Ride: 2008 550i M-Sport
I had been seeing a random CEL for the last year. The dealer pulled the code for me and said the left rear oxygen sensor was bad. I finally decided to order and replace the bad oxygen sensors. Getting the sensor out was not difficult but pulling the wire out of the socket and out of the bracket was a pain the rear! What I really find interesting is that even though the exhaust was cool to the touch the transmission was still hot, 3 hours after sitting. Sorry no pictures. Project took me about 30 minutes. So far no CEL light!
03-19-2012, 09:39 AM
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My Ride: 04' 545i, Sport Package, Black, Active Xenon, ARS, Aux Input
'10 Tahoe, Black on Black, leather, Nav/XM, 20" tires, full body kit, power 2nd row, loaded
'93 Jeep Wrangler, lifted 4.5", 33" meats, Rampage Recovery Bumper w/Tire Swing, etc
25' Aquasport Osprey, Center Console,2012 200 HO Etec
I would think the tranny was hot due to transmission fluid being present - the exhaust is empty and can cool quicker.
04-02-2012, 04:31 AM
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My Ride: 2008 550i M-Sport
I bought the sensor from www.bavauto.com for $150. It was a bosch sensor that was an exact match to the one I took out. As far as fuel consumption I have only run one tank through and my mileage went up 1.3 mpg, but i only replaced one of the four sensors in my car. I may replace the other rear one on the passenger side and see if it makes a difference.
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