From digest.v7.n691 Tue Dec 2 13:25:38 1997
From: Ethan Stock <ethans_at_uclink4.berkeley.edu>
Date: Mon, 01 Dec 1997 20:38:46 -0800
Subject: Cheap Replacement o2 sensor

Ben,

These are culled from a few months ago. Hope they help (and thanks to the original posters):

vvvvvvvvvvvvvvvvvvvv From: bmw4curt_at_juno.com (Curtis Kiser) Date: Fri, 27 Jun 1997 21:24:14

• -0400 Subject: <E28> replacement O2 sensor - CHEAP

I received a great tip from a digester a few months ago. Allen from Simpsonville, SC, THANK YOU! Your suggestion for using the Bosch part that goes in a 5.0 liter 1990 Mustang works great on my big six. And wow what a difference in price. The local parts store wants only $39 for the Bosch part no. 13942 and then asked $132 for the part as it crossed to my BMW 535i. The sensor numbers were almost identical (off by the last digit of 1..ex..0258003008 vice 0258003009 for the new one). Better yet the sensors were identical except for the different wiring plug. Expensive plug folks!!! I just soldered the old plug onto the new sensor and everything worked great. My big six idles a little better too (it was running rich according to the black tail pipes). Response picked up and I'm hoping for better gas mileage. Once again I receive great tips from this digest...keep it up folks.

Any questions about the sensor, feel free to contact my personal e-mail. Curt Kiser BMW CCA #118507 Tidewater Virginia chapter 85 535i

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And:

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4. Regarding substitution, Bosch lists #13942 as its interchange for the Ford DY606 that others have recommended, and is cheaper. Cheaper still, and apparently identical to the 942 except for the connector which will be cut off anyway is 13913, whose original application was an 86 Taurus V-6, (I paid about $44 for it). This is even less than some of the kits available by mail order and given that the original application is as common as dirt, it should be in stock at any auto parts store in North America that sells Bosch. (BTW, both of these sensors appeared the same as my (literally) factory original at the tip, but the barrel was somewhat shorter) At this price, there is no reason not to change your sensor every 60,000 miles, which is Bosch's current recommendation, especially since you will get your money back in increased mileage fairly quickly- see below.

5. I notice an immediate increase of about 2-3 mpg after replacing the sensor.

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• Ethan 535is a la Dinan Baboon*obile (no M)