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Default Which O2 sensor is bad? - 06-01-2018, 02:42 PM

Hello everyone,

I’ve had this issue for quite some time without finding a solution and I’d figure now is the time to fix it. I have replaced my pre-*** o2 sensors not exactly at the same time but they are both fairly new. And no I’m pretty sure they are located in the correct ********* as I know that is a possibility. I still get check engine lights on the car. Here are the codes I get

2C31 Lambda probe in front of catalytic converter, trimming control
2F7B Oil pressure switch, plausibility
29E1 Fuel mixture control 2

Here is the o2 sensor part number of the black wire o2 sensor that I replaced that I believed was the issue. OEM Part #: 11787558055

Why am I still getting codes ? Did I change the wrong O2 sensor? Is it Post *** O2 sensors ?


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Default 06-01-2018, 03:07 PM

That should be the primary O2 sensor for Bank 1. You could have swapped the wrong O2 sensor more than likely.


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Default 06-01-2018, 03:23 PM

Are you referring to the grey wire one is th bad O2? This part #: 11787558087?


335i e90 sedan| Cobb catted *** | Muffler Delete | VRSF 5’ stepped intercooler| BMS OCC | BMS dual cone | MMP Inlets | BMS Oil Temp Cooler | JB4 G5 | PureEvilTuning Custom E60 BF | XHP TCU Flash | Phoenix Racing Charge Pipe | Tial BOV | 3.5 Bar | Stock Turbos | NGK 2 Step Spark Plugs (0.020 Gap) | Fuel It Stage 2 | 19psi making 475whp & 528lb tq |
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Default 06-01-2018, 04:40 PM

Could this be due to the amount of E85 vs what the tune reads ?


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Default 06-01-2018, 05:06 PM

I had the trimming control code and it was the rear O2 on that bank.

I can't explain it exactly, but there is some sort of interaction between the primary and secondary where the DME validates the readings between the two. I spent a lot of time and money troubleshooting my issue (including replacing the primaries) and it was the secondary all along.

I also had some sort of aging code for the secondary O2 sensor as well, which you don't appear to have.
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Default 06-01-2018, 05:11 PM

By secondary, do you mean post cats? Do you have part numbers by chance? Would this be on the outer ********* I’m guessing?


335i e90 sedan| Cobb catted *** | Muffler Delete | VRSF 5’ stepped intercooler| BMS OCC | BMS dual cone | MMP Inlets | BMS Oil Temp Cooler | JB4 G5 | PureEvilTuning Custom E60 BF | XHP TCU Flash | Phoenix Racing Charge Pipe | Tial BOV | 3.5 Bar | Stock Turbos | NGK 2 Step Spark Plugs (0.020 Gap) | Fuel It Stage 2 | 19psi making 475whp & 528lb tq |
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Default 06-01-2018, 06:07 PM

Quote:
Originally Posted by mj6234
I had the trimming control code and it was the rear O2 on that bank.

I can't explain it exactly, but there is some sort of interaction between the primary and secondary where the DME validates the readings between the two. I spent a lot of time and money troubleshooting my issue (including replacing the primaries) and it was the secondary all along.

I also had some sort of aging code for the secondary O2 sensor as well, which you don't appear to have.
I had the same thing, secondary O2 cause the code and cleared once I replaced it.


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Default 06-01-2018, 07:14 PM

Thank you! I will go ahead and buy that O2 sensor


335i e90 sedan| Cobb catted *** | Muffler Delete | VRSF 5’ stepped intercooler| BMS OCC | BMS dual cone | MMP Inlets | BMS Oil Temp Cooler | JB4 G5 | PureEvilTuning Custom E60 BF | XHP TCU Flash | Phoenix Racing Charge Pipe | Tial BOV | 3.5 Bar | Stock Turbos | NGK 2 Step Spark Plugs (0.020 Gap) | Fuel It Stage 2 | 19psi making 475whp & 528lb tq |
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AZN54 AZN54 is offline
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Default 06-04-2018, 07:49 PM

I had something very similar on bank 2. Replaced pre-*** o2, code remained. Replaced post-*** and cleared it up.

Make sure you reset adaptations after.


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Default 06-18-2018, 12:21 PM

Update: Took a while to do this, but changed the secondary O2 and no more codes ! Thank you all !


335i e90 sedan| Cobb catted *** | Muffler Delete | VRSF 5’ stepped intercooler| BMS OCC | BMS dual cone | MMP Inlets | BMS Oil Temp Cooler | JB4 G5 | PureEvilTuning Custom E60 BF | XHP TCU Flash | Phoenix Racing Charge Pipe | Tial BOV | 3.5 Bar | Stock Turbos | NGK 2 Step Spark Plugs (0.020 Gap) | Fuel It Stage 2 | 19psi making 475whp & 528lb tq |
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