What do I check next?

aphhpa · 06-17-2011, 03:43 PM

I've had "oxygen sensor adaption limitation" in all cylinders for more than a year. Ive replaced disa, maf,, lower and upper intake boots. The car randomly performs bad. Like sometimes it is just awfly slow, other times it's okay. It's gradually getting worse. I'm
Leaning towards my u2 sensors or icv next. Suggestions?

Mango · 06-17-2011, 03:44 PM

sooo you've replaced everything except the part named in the code?

Zchild · 06-17-2011, 04:03 PM

I would suggest you replace the O2 sensors pre-cat which is the easy possibility but it sounds more like your Crankcase Vent Valves (CVV) hoses are probably cracked and need replacement. I had some of the same symptoms and it turned out to be my CVV hoses. Just my two and a half cents worth...

aphhpa · 06-17-2011, 04:21 PM

I didn't think the oil separator had much to do with oxygen sensors. I had work done on my oil separator from BMW since the codes started more than a year ago. I think they would have caught it, or I'd like
To think so.

06-17-2011, 03:43 PM	#1
aphhpa Registered User Join Date: Mar 2007 Location: West Point, NY Posts: 1,445 My Ride: 2001 330Ci View My Garage	What do I check next? I've had "oxygen sensor adaption limitation" in all cylinders for more than a year. Ive replaced disa, maf,, lower and upper intake boots. The car randomly performs bad. Like sometimes it is just awfly slow, other times it's okay. It's gradually getting worse. I'm Leaning towards my u2 sensors or icv next. Suggestions? __________________

06-17-2011, 03:44 PM	#2
Mango Registered User Join Date: Mar 2006 Location: Southern California Posts: 16,544 My Ride: M54B30 View My Garage	sooo you've replaced everything except the part named in the code? __________________ Cooling \| Maintenance \| Vacuum \| Suspension \| Costs "Be a yardstick of quality. Some people aren't used to an environment where excellence is expected." -Steve Jobs

06-17-2011, 04:03 PM	#3
Zchild Registered User Join Date: Mar 2006 Location: Columbia, Maryland Posts: 1,657 My Ride: 2000 BMW 3XXi ZSP View My Garage	I would suggest you replace the O2 sensors pre-cat which is the easy possibility but it sounds more like your Crankcase Vent Valves (CVV) hoses are probably cracked and need replacement. I had some of the same symptoms and it turned out to be my CVV hoses. Just my two and a half cents worth... __________________ V/R Zachary Pullins Sr. National Capital Chapter BMWCCA NCC Member Recognition Chairman NCC High Performance Driving School Registrar NCC Auto-X BOD Liaison DIY Senior Committee Coordinator 2006 E90 325Xi & 2000 E46 3XXi " Vision without resources is just hallucination" Last edited by Zchild; 06-17-2011 at 04:33 PM. Reason: Additional information

06-17-2011, 04:21 PM	#4
aphhpa Registered User Join Date: Mar 2007 Location: West Point, NY Posts: 1,445 My Ride: 2001 330Ci View My Garage	I didn't think the oil separator had much to do with oxygen sensors. I had work done on my oil separator from BMW since the codes started more than a year ago. I think they would have caught it, or I'd like To think so. __________________

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