First failure

GregW / Oregon · 12-19-2019, 11:54 AM

My '15 M4 was just in the shop at 38.7k mi. because of a check engine (increased emissions) light on. Turned out to be a failed O2 sensor, "Moisture entered the internal insulation layers of the oxygen sensor."

I had my clutch replaced under warranty for a occasional minor roughness, but this is really the first outright failure I've had. Was covered by the 8/80 emissions warranty, of course.

TrauCon · 12-19-2019, 12:25 PM

I would think the O2 sensor would be too hot for any moisture to build up in there. But it is good to know. Thanks.

AJJ3 · 12-19-2019, 01:17 PM

I had an 02 sensor failed at 86k miles.

SD ///M4 · 12-19-2019, 02:46 PM

Quote:

Originally Posted by AJJ3

I had an O2 sensor failed at 86k miles.

It looks like it must have failed outside of the 80,000 mile emissions warranty. What was the cost?

kss · 12-19-2019, 02:54 PM

Is the emissions warranty longer than the general warranty (50k m / 80k km)??

nickl630 · 12-19-2019, 03:16 PM

Quote:

Originally Posted by kss

Is the emissions warranty longer than the general warranty (50k m / 80k km)??

In the US it is, 8yr/80k. California and some other states are 10/100 on ATPZEV and I think SULEV vehicles as well. (Hybrids and whatnot)

SD ///M4 · 12-19-2019, 03:17 PM

Quote:

Originally Posted by kss

Is the emissions warranty longer than the general warranty (50k m / 80k km)??

U.S. and Canada emissions standards may differ and there may be different emissions warranties.

In the U.S., the warranty is up to 8 years/80,000 miles for certain emissions-related components, so to answer your question, yes, for U.S. vehicles, and the mileage is in miles, not kilometres. Your situation may differ.

JoeFromPA · 12-20-2019, 11:41 AM

5 year old vehicle that is lightly driven and lives in a wet environment...

Not exactly a surprise that moisture helped that component fail

12-19-2019, 11:54 AM	#1
GregW / Oregon Commander-In-Chief 2196 Rep 8,947 Posts Drives: 2023 M2 Coupe, 2020 GLE 450 Join Date: Nov 2005 Location: Lake Oswego, OR iTrader: (3) Garage List 2023 M2 Coupe [9.83] 2020 Mercedes GLE 450 [7.25]	First failure My '15 M4 was just in the shop at 38.7k mi. because of a check engine (increased emissions) light on. Turned out to be a failed O2 sensor, "Moisture entered the internal insulation layers of the oxygen sensor." I had my clutch replaced under warranty for a occasional minor roughness, but this is really the first outright failure I've had. Was covered by the 8/80 emissions warranty, of course. __________________ Greg Lake Oswego, Oregon, USA 2023 M2 Coupe - Brooklyn Grey/Cognac/CF, 6MT; 2020 MB GLE 450
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12-19-2019, 12:25 PM	#2
TrauCon Private First Class 60 Rep 115 Posts Drives: F80 M3 AlpineWhite Join Date: Oct 2018 Location: Saigon Vietnam iTrader: (0)	I would think the O2 sensor would be too hot for any moisture to build up in there. But it is good to know. Thanks.
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12-19-2019, 01:17 PM	#3
AJJ3 Private First Class 32 Rep 112 Posts Drives: M4 Join Date: Dec 2016 Location: DMV iTrader: (0)	I had an 02 sensor failed at 86k miles.
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12-19-2019, 02:54 PM	#5
kss First Lieutenant 177 Rep 365 Posts Drives: 2017 AY F80 ZCP Join Date: Sep 2018 Location: canada iTrader: (0)	Is the emissions warranty longer than the general warranty (50k m / 80k km)??
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12-20-2019, 11:41 AM	#8
JoeFromPA Colonel 1797 Rep 2,997 Posts Drives: '15 AW M3 6MT Stripper Join Date: Aug 2013 Location: SE PA iTrader: (0)	5 year old vehicle that is lightly driven and lives in a wet environment... Not exactly a surprise that moisture helped that component fail
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