Check engine light .... ALL O2 sensors

my_wifes_E90 · 12-29-2015, 11:26 PM

Keeping it short.. hope to get some insight

2009 328i x Drive 84000 km

Check engine light came on... car idles and drives fine

...had it diagnosed at midas

Multiple codes all to do with O2 sensor... all 4 sensors to be exact

Service person was dumbfounded on how low KM and ALL 4 sensors triggering a check
Engine light...

Don't want to take it to the STEALERSHIP until I have to...

Efthreeoh · 01-02-2016, 08:30 AM

I'd clear the codes, run a tank of good tier 1 gas (Shell) though it and see of the codes come back.

robthewrench · 01-05-2016, 08:26 AM

Agreed, clear the codes and have them read again as soon as you get an error light. You might want to try a different mechanic as well, unless you've been to this midas for engine repair before and know they get it right every time.

Even my most trusted independent mechanic sometimes gives me a diagnosis that I know can't be right. Usually he and I can agree to check again to verify.

If you do get the same error, it could be a wiring short issue rather than a set of failed 02 sensors.

12-29-2015, 11:26 PM	#1
my_wifes_E90 New Member 2 Rep 8 Posts Drives: 09 328i xdrive Join Date: Mar 2014 Location: Toronto iTrader: (0)	Check engine light .... ALL O2 sensors Keeping it short.. hope to get some insight 2009 328i x Drive 84000 km Check engine light came on... car idles and drives fine ...had it diagnosed at midas Multiple codes all to do with O2 sensor... all 4 sensors to be exact Service person was dumbfounded on how low KM and ALL 4 sensors triggering a check Engine light... Don't want to take it to the STEALERSHIP until I have to...
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01-02-2016, 08:30 AM	#2
Efthreeoh General 19194 Rep 19,722 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	I'd clear the codes, run a tank of good tier 1 gas (Shell) though it and see of the codes come back. __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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01-05-2016, 08:26 AM	#3
robthewrench Captain 266 Rep 950 Posts Drives: 11 E90 335i Join Date: Aug 2014 Location: Columbus OH iTrader: (0)	Agreed, clear the codes and have them read again as soon as you get an error light. You might want to try a different mechanic as well, unless you've been to this midas for engine repair before and know they get it right every time. Even my most trusted independent mechanic sometimes gives me a diagnosis that I know can't be right. Usually he and I can agree to check again to verify. If you do get the same error, it could be a wiring short issue rather than a set of failed 02 sensors. __________________ bone stock
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