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#3
07-10-2015, 11:40 PM
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Quote:
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas 
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#7
07-11-2015, 09:17 AM
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Could be the efficiency of the cat for that bank. The post cat 02 sensor doesn't control fuel trim like pre cat 02 sensors. One simple test to perform is if you have an infrared thermometer is to drive the car until the temp is up and use the infrared thermometer to measure the temp at the inlet of the cat and at the outlet of the cat. The outlet temp should be greater then the inlet temp if the cat is working properly.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#8
07-11-2015, 10:05 AM
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Suspect couple of things going on - simple code reader converts and groups 4 digit codes to 2 digit. Some fidelity is lost there...
New part can be defective, someone else's return, or just plain counterfeit. Glad at least it's a name brand sensor As pall night suggested, it could be a bigger problem that replacing O2 sensor didn't fix.
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David.X5 2001 X5 4.4i Sport SOLD! at 160k miles
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#9
07-22-2015, 05:42 PM
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What was the answer to the question as to why you replaced the sensors?
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#10
07-24-2015, 09:20 AM
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I'm sorry, there is no clear answer to this. A couple of thoughts - just guesses...
1) The Bav Auto code reader isn't helping much. It is somehow translating several different possible BMW codes (4 digits) into one of a few 2 digit codes. Find a friend or indy shop that can read the actual BMW codes and post those. 2) post-cat O2 sensors mostly report on the health of the cat. Very few reasons one would throw a code except the O2 sensor is bad. You could try switching the left and right side post-cat O2 sensors and see if the code follows the sensor. If it does, you got a bad sensor. 3) If you get your hands on a proper BMW code reader, clear the adaptations. It is possible the engine is still trying to read the new O2 sensor based on the map it learned from your old O2 sensor.
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David.X5 2001 X5 4.4i Sport SOLD! at 160k miles
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