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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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  #1  
Old 03-18-2014, 02:45 PM
BurningIce BurningIce is offline
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Oxygen sensor replacement

it seems that i have a faulty O2 sensor B2S2.
the shop suggested to change all 4 sensors at the same time.

i am wondering if it makes any sense to do so? or can i save the extra cash in avoiding it?

Last edited by BurningIce; 06-25-2014 at 10:38 AM.
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  #2  
Old 03-18-2014, 04:59 PM
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dc_wright dc_wright is offline
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It depends on what the failure was in the O2 sensor. If it was the internal heater I'd only replace that O2 sensor as that's not a "wear" failure and I'd expect to get some more life out of the other three.
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  #3  
Old 03-18-2014, 05:16 PM
kalali kalali is offline
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How many miles on the car? The more information you provide the more useful advice you'll get...And what does "it seems" mean to imply? You either have a bad sensor or you don't..
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  #4  
Old 03-19-2014, 11:53 AM
BurningIce BurningIce is offline
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these are the error codes i'm getting from the car:
P114D
P2096
p2096
p2198

i also had a code for a faulty MAF sensor and its gone once I've replaced the MAF but the rest still keeps popping up.
the shop did a vacuum test and they did not discover any leaks and suggested to replace all the O2 sensors.

my car has 64K miles, so i assumed it might be a regular wear of the component.
any thoughts?

Last edited by BurningIce; 03-19-2014 at 11:54 AM. Reason: missing information
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  #5  
Old 03-19-2014, 05:22 PM
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shipkiller shipkiller is offline
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Normally you only have to replace the pre-cat O2 sensors (B1S1 & B2S1). You can only replace the faulted sensor or on a higher mileage engine I would recommend both. The post-cat O2 sensors (B1S2 & B2S2) normally almost never fault out.

The sensors do not have to throw a code for them to be faulty..... In that instance, the fault normally manifests itself as low fuel economy.
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  #6  
Old 03-19-2014, 05:31 PM
BurningIce BurningIce is offline
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so, what might be the reason for these fault codes? any idea?
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  #7  
Old 03-21-2014, 01:16 AM
Z4orums Z4orums is offline
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Just had my codes checked and got the same error; faulty oxygen sensor 2. The mechanic at autozone told me it's possible that the sensor could be reading an emissions failure or insufficiency from the exhaust. I have a stock exhaust system but if needed I was looking to upgrade. An Eisenmann race exhaust perhaps; although I've never installed a mod part before would this remedy the problem?
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  #8  
Old 03-21-2014, 12:32 PM
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shipkiller shipkiller is offline
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How do you get from a faulty O2 sensor to fixing the issue with a new muffler?
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #9  
Old 03-21-2014, 03:39 PM
kalali kalali is offline
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Quote:
Originally Posted by shipkiller View Post
How do you get from a faulty O2 sensor to fixing the issue with a new muffler?
Can't wait to hear the answer to this...
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  #10  
Old 06-25-2014, 10:22 AM
BurningIce BurningIce is offline
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How can i identify out of the 4 sensors which one is the oxygen sensor marked as Bank2 sensor1?

Last edited by BurningIce; 06-25-2014 at 10:37 AM.
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  #11  
Old 06-25-2014, 10:39 AM
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shipkiller shipkiller is offline
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Bank two, sensor one (B2S1), is the pre-cat sensor on cylinders 4-6.

Pre-Cat sensors (B1S1/B2S1) are closest to the exhaust ports. Post-Cat sensors (B1S2/B2S2) are down stream (after the cats) of the exhaust system towards the rear of the car.
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #12  
Old 06-25-2014, 11:24 AM
BurningIce BurningIce is offline
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I see 2 sensors Pre-Cat.
any way to know which one is B1S1 and which is B2S1?
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  #13  
Old 06-25-2014, 11:40 AM
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Look at your engine. You will see your exhaust header(s), Cylinder one is at the front, and cylinder six is at the rear...
There are two exhaust headers, one for cylinders one through three and one for cylinders four through six.

Cylinder BANK ONE (B1) are cylinders one through three. Cylinder BANK TWO (B2) is cylinders four through six.
Look for the three exhaust pipes from BANK TWO (cylinders four through six). Where those three pipes enter the cat is where the B2S1 sensor is located.
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #14  
Old 06-25-2014, 02:57 PM
BurningIce BurningIce is offline
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Thank you ShipKiller.
So, just to clarify, the part i need would be #1 on this diagram?
http://www.realoem.com/bmw/showparts...64&hg=18&fg=10
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  #15  
Old 06-25-2014, 04:13 PM
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shipkiller shipkiller is offline
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Thank God... someone uses RealOEM...

Actually, part one would be Bank one sensor one (B1S1). Your post wanted B2S1 which would be part two (2).

When I had to replace an O2 sensor on the 03, I replaced both pre-cat O2 sensors, just to make sure I did not have to do this again. Replacing both is the best solution. The post-cat sensors very seldom fail.
Also, a failing O2 sensor does not always throw a code.

If you do decided to replace both, REMEMBER to MARK the box's as to which ones are front or rear (B1 or B2) BEFORE you leave the store. I know the part numbers on RealOEM are the same, but when I when to AdvancedAuto to get new sensors, the box's are not marked and the wires are different lengths.....
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #16  
Old 06-25-2014, 04:32 PM
BurningIce BurningIce is offline
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are there any after market alternatives for that part? (Bosch? NTK? DENSO?)
Advanced auto have lots of alternatives, i'm wondering if it makes sense to use them or just to use BMW originals.
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  #17  
Old 06-25-2014, 04:50 PM
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My personal theory is, on any BMW other than an ///M, I would say do not worry about it.... On the S54, it is a high reving engine so the O2 sensor needs to be fast. In that case, I would use as close to OEM as possible. I think the OEM's are Bosch.
It's just too bad that the O2 sensors on the S54 are so expensive.

I have yet to replace my sensors on my ///M, even with all the track miles... knock wood.
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How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
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  #18  
Old 06-26-2014, 12:33 PM
BurningIce BurningIce is offline
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OK, did some digging.
I found that BOSCH 15168 should be the equivalent for the BMW original.

is there anyway to confirm that?($100 difference between that and the original)
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  #19  
Old 06-26-2014, 03:45 PM
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dc_wright dc_wright is offline
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Should be marked on the O2 sensors installed in the car now. I know it's a pita to put the car on the jack stands and look. Another option is to stop in at the dealer and ask for the O2 sensor. When the parts guy hands it to you check the number, and then find an excuse to leave without buying it......
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  #20  
Old 06-27-2014, 05:07 AM
kalali kalali is offline
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Quote:
Originally Posted by dc_wright View Post
Should be marked on the O2 sensors installed in the car now. I know it's a pita to put the car on the jack stands and look. Another option is to stop in at the dealer and ask for the O2 sensor. When the parts guy hands it to you check the number, and then find an excuse to leave without buying it......

I thought I was the only one who knew that trick....
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  #21  
Old 06-27-2014, 08:51 AM
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dc_wright dc_wright is offline
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Quote:
Originally Posted by kalali View Post
I thought I was the only one who knew that trick....
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  #22  
Old 06-27-2014, 02:58 PM
BurningIce BurningIce is offline
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Updating on the outcome:

Just installed the new Bosch sensor, and it seems that i got my car back!
Low RPM is stable again, and overall responsiveness is much better!

I almost forgot how the car was supposed to drive

Thanks for all the help!
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  #23  
Old 06-27-2014, 03:38 PM
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Good deal! If you happen to get a CEL in the next day or so, don't sweat it. Sometimes they drift a bit during the first few heating cycles and then settle in and they're good. When I replaced them on my E36 all was good the first day. 2nd day got an O2 CEL. It lasted about 6 days and then was gone for good.
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  #24  
Old 06-28-2014, 10:43 AM
BurningIce BurningIce is offline
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Update #2.
it seems that the SES light is back.
i'm getting the P2096 code - Post catalyst fuel trim system too lean bank 1.

i tried to clear the code and it comes back after 8 miles every time.
so far i've replaced the MAF and the oxygen sensor.

any thoughts?

Edit:
when i was trying to reach the Sensor, i took the Vacuum valve off and i suspect that the gasket there is nos sealing properly. (might be causing a leak?)
going to try to replace the gasket and see if it solves the problem.


Any difference between these 2 parts?
http://www.ecstuning.com/Search/Site...05259/ES26760/
http://www.ecstuning.com/Search/Site...259/ES2091332/

Last edited by BurningIce; 06-28-2014 at 11:24 AM.
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