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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Jul-05-2012, 04:41:45 PM   #1
KS Golfer
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Default O2 Sensor problem? coils? something else?

900 miles back and forth from KC to MN in the M this week.

yesterday on the way back about 100miles from home the SES light comes on. went to O'Reiley this morning to borrow their reader - P0159 secondary O2 sensor. the reader seemed to indicate a "page 2" of codes, but when i thought i checked it gave me the same code. maybe it was just the same fault code for the other cyl bank O2 sensor.

recent symptoms of a problem are an inconsistent hesitation/hiccup at idle and i think a minor stumble under acceleration at low rpm (2500-3500). also, when stopping at taco bell drive through 300miles into my trip home; from a slow roll pulling out of the parking lot in 2nd resulted in significant lurching. not too terribly long after that is when the SES light came on.

so do you guys think i really have an O2 sensor problem or is there something else going on here? since i was going through iowa i was burning their wonderful subsidized 89oct ethanol blend, and basically setting cruise at 80mph the entire trip both ways. like the rest of the country, ambient temps above 100, but water and oil temp stayed normal. i do remember in my old nissan 240sx i had EGR issues during long trips at steady RPM, not sure if something similar is going on here.

also, i was starting to think my coils may need replaced due to the hesitation/hiccup, which if true could cause an inefficient burn and foul the sensors.....though i would think the pre-cat sensors would go out before the post cat ones.

any thoughts? if they were $50 or whatever like regular O2 sensors i'd just replace them, but at $175ea that gets to be an expensive experiment.

almost forgot; 2003.5 w/94k miles and inspection II completed recently
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Old Thu, Jul-05-2012, 05:39:03 PM   #2
lsbm3nm
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Default Re: O2 Sensor problem? coils? something else?

Bosch O2 sensors can be had for about $70 on amazon. Bosch part numbers for Pre cat O2 sensors are as follows:

Pre Cat Bank 1 (cyl. 1-3): 13949 (Currently $62.00 w/ $8 shipping on amazon)






Pre Cat Bank 2 (cyl. 4-6): 13952 (Currently $70.18 on amazon)





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Old Fri, Jul-06-2012, 04:47:20 AM   #3
RedM3/4
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Default Re: O2 Sensor problem? coils? something else?

There are more than one type of 02 sensor code, any more specifics? Lean, votage to low, anything like that?
I'd run some techron through the tank (not the cheap $3 stuff, Techron) per directions, see if that helps.
If you haven't installed headers, don't have headers, and haven't done anything to disrupt the wires, if the techron doesn't help, probably time for new sensors, not uncommon at your miles. Even if techron helps, you can expect it to come back; could be a few hundred miles, maybe a couple thousand.
If you have headers, maybe the cable re-route moved and a wire is burned.

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Old Fri, Jul-06-2012, 05:07:05 AM   #4
KS Golfer
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Default Re: O2 Sensor problem? coils? something else?

o2 circuit slow bank 2 sensor 2. OEM headers. i have run redline fuel system cleaner through the car within the last few thousand miles.
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Old Fri, Jul-06-2012, 05:32:56 AM   #5
RedM3/4
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Default Re: O2 Sensor problem? coils? something else?

Well, probably time to try a sensor. I know nothing of Redline fuel additive, I'm sure folks swear by it, don't care.
Techron (Chevron) did all the original research on this high end/effective type of additive many years ago; BMW and VW recommend it, and I've seen DEMONSTRABLE results with it. So that's all I use. However, using too much Techron, and probably Techron after Redline/brandx, can cause injector leaks, so I'm NOT suggesting doing it now, only switching to it in the future - every 10k miles or so.

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Sold to my son, still in the family!
06 SMG/ZCP - April 09, Dinan over Konis, RAC RG63, homelink with off-delay (working), multifunction steering wheel buttons, RacingBrake Front kit.
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Old Fri, Jul-06-2012, 12:39:52 PM   #6
KS Golfer
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Default Re: O2 Sensor problem? coils? something else?

thanks for the heads up on the sensors from amazon.
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Old Fri, Jul-06-2012, 03:06:19 PM   #7
lsbm3nm
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Default Re: O2 Sensor problem? coils? something else?

No problem!
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Discussing secondary air pump replacement in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)