Oxygen sensor pre cat E90 330i N52

bmwhitman · 11-22-2015, 10:02 AM

Do I need to remove the engine cover to replace the pre-cat O2 sensors? Is it necessary if I have socket extensions ?

Efthreeoh · 11-23-2015, 02:08 PM

Yes, you need to remove the engine cover. The pre-cat sensors connect into a harness on top of the engine under the engine cover. You need to use an O2 sensor removal socket. I wrote a DIY to do the Bank 2 sensor probably 5 years ago. It's in the DIY section somewhere.

http://www.e90post.com/forums/showthread.php?t=459104

11-22-2015, 10:02 AM	#1
bmwhitman Private First Class 46 Rep 177 Posts Drives: E90 Join Date: Aug 2011 Location: Toronto iTrader: (0) Garage List 2006 BMW 330i (E90) [0.00]	Oxygen sensor pre cat E90 330i N52 Do I need to remove the engine cover to replace the pre-cat O2 sensors? Is it necessary if I have socket extensions ?
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11-23-2015, 02:08 PM	#2
Efthreeoh General 17309 Rep 18,733 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	Yes, you need to remove the engine cover. The pre-cat sensors connect into a harness on top of the engine under the engine cover. You need to use an O2 sensor removal socket. I wrote a DIY to do the Bank 2 sensor probably 5 years ago. It's in the DIY section somewhere. http://www.e90post.com/forums/showthread.php?t=459104 __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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