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#1
11-09-2017, 01:18 PM
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o2 Sensor Codes...
I have had the following codes just pop up on my BMW X5 4.6is (146K) 17 o2 sensors 1 after 12 o2 sensors 2 after 14 o2 sensors 1 heater after Does this mean I am now changing out all 4 of these little devils? 
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#2
11-09-2017, 01:59 PM
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Not necessarily. If you are not sure that all codes popped up at once, I would clear the codes and see what comes back. If they did, my input would be that codes are the result of something else that is the core issue not the sensors. The pre cat sensor is part of the air/fuel mixture determination. The post cat sensor focus on emissions. I suggest troubleshooting the cause rather than replacing the sensor at this point. Do you know if the codes were generated during a cold start? Have you lost any engine performance, idling RPMs normal, engine missing? Even if all is fine, I would start troubleshooting by checking for vacuum leak.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#4
11-11-2017, 01:13 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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#6
11-13-2017, 06:56 PM
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Are you able to look at live data fuel trims?
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#7
12-31-2017, 01:12 PM
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Quote:
I have an MT2500 but unknown if this has the capability. I reset and drove for about another 40 miles and it popped back on today ... code 17. How (if it is possible) can I live data fuel trims?
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#8
12-31-2017, 02:07 PM
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Normally if the 02s after the cats are reporting a problem, it could mean the catalyst efficiency is not up to the design parameter. I would just take it to an auto part store that will scan the X for FREE. This way you can post some generic P codes that everybody can understand instead of the priority P code from a Snap-On MT2500 scanner. What does the Snap-On book say about the codes?
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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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#9
01-08-2018, 04:28 PM
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Ok put in my non BMW cartridges. Code P0140 02 pulled. Test revealed Bank 1 Sensor 2 Failed. All others passed.
B1 S1 calc (v) .745 min limit .475 max limit 1.005 B1 S2 1.025 .480 1.005 B2 S1 .810 .475 1.005 B2 S2 .820 .480 1.005 Both Min and Max Sensor Failed with Back 1 Sensor 2 Does this mean to replace only that O2 Sensor?
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#10
01-08-2018, 04:46 PM
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Since its showing higher AFTER the cat then I would think that sensor is bad or fowled.
Its usually high then low not low then high.
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Just BMW's - All cars and trucks was two pages long 1994 318is 1997 528i 2000 323i 2001 X5 3.0 auto 2005 X5 3.0 auto 2011 535xi auto 2013 X5 xdrive35 Turbo More are at my website Aftermarket E53 Radio Install
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