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I agree with Alex, also the O2 sensor wire on a (archive)

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Posted by Bill R. on September 27, 2001 at 10:11:15:

In Reply to: Re: O2 Sensor tip replacement kits? posted by alex lynch on September 27, 2001 at 08:47:23:

bmw is unusually long so more chances for resistance to build up in a circuit carries less than 1 volt. So don't screw around with splicing o2 sensors just replace the whole thing. It has a new socket on the end as well that can get corroded.

The oxygen sensor basically sends a low voltage signal back to the DME which in turn controls the air/fuel mixture. The problem with splicing this low voltage wire is that if the solder connection is not good, then the signal to the DME will also not be very good.

You can buy the oxygen sensor for a little over $100 (Maximillian or Hendricks BMW) and the "pigtail" costs around $70. It is something you replace every 60K miles and directly influences the car's performance. In my opinion, don't skimp on the price. Buy the real thing.


Anyone have experience with these kits that suggest you unscrew the sensor tip from the housing, cut the wires, and replace/splice with their new tip? Are they as good as buying the entire assy. w/wiring?

90 535iM

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