Precat Oxygen Sensor Repalcemnt, not so straignt forward - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 01-10-2012, 06:05 PM
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Precat Oxygen Sensor Repalcemnt, not so straignt forward

I have a 2003 325i that I've had for about two years, it has about 90k miles and has the SES light on. It was diagnosed to have a bad precat o2 sensor. The part came in today and I went about replacing it following a very good DIY guide. ( Pre-cat Oxygen Sensor DIY (lots o pix) - E46Fanatics ) My problem is that the 02 sensor I received has a short plug just like in DIY, but one ones on my car (passenger side) has long plugs that wrap around the the back of the engine. I've looked at it over and over and there is no boot where the o2 sensor disconnects from the long wire going behind the engine. My car's o2 sensor is one long continuous wire from the o2 sensor running all the way around the engine. Suggestions?

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#2 (permalink) Old 01-11-2012, 03:19 PM
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Maybe the wrong part, 2002 was a significant year for part/model changes... Just a thought, sorry!


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#3 (permalink) Old 01-13-2012, 12:12 PM
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Thanks for the input, after alot of investigating I found out that BMW made changes to their 3 series midway through the 2003 production year. Those cars made after April have a 2004 engine build so I really should have ordered an O2 sensor for an '04. Part comes in today, I'll post if it solves.

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#4 (permalink) Old 01-13-2012, 02:03 PM
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Good stuff mate... Can you get a refund on the other one?

BTW When I said 2002 for model changes, that was at the German side lol


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