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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Replacing front o2 sensors, easy?



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      08-06-2009, 10:56 AM   #1
JohnL135I
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Replacing front o2 sensors, easy?

I might have a bad o2 sensor.

How easy is it to replace the factory o2 sensor(Pre Cat sensors) with AR downpipes? Is the wiring harness easy to unclip?


Whats the best option for a new 02 sensor? Dealer or Autozone?

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      08-06-2009, 11:28 AM   #2
scalbert
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It doesn't appear to be too bad. You will need to remove the sensor from below but the harness threads around the back of the engine and under the engine cover. Probably about an hour job.

You can get stock replacement units from a delear or autoparts store.

http://shop.advanceautoparts.com/web...S_909609052___
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