[insanesam]

Was previously getting the above oxygen sensor codes.
Replaced the bank 2 pre-cat oxygen sensor and cleared the adaptations.
Seemed ok for a few hundred km. Today the CEL came on and the codes are back.
Anyone have any ideas?

[MJ80.]

What do those codes translate to though ?

Ive been getting consistently

2c31 lambda code in front trimming control

2c28 lambda code in front system check

And less regularly

2c6b lambda probe behind

I put this down to injectors and just replaced all 6 and while the car now drives awesome, the codes continue to appear specifically after wot and then cruising at low rpm.

Do you run MHD burble by any chance ?

[insanesam]

Originally Posted by MJ80.

What do those codes translate to though ?

Ive been getting consistently

2c31 lambda code in front trimming control

2c28 lambda code in front system check

And less regularly

2c6b lambda probe behind

I put this down to injectors and just replaced all 6 and while the car now drives awesome, the codes continue to appear specifically after wot and then cruising at low rpm.

Do you run MHD burble by any chance ?

2C3E Lambda probe in front of catalytic converter 2, control failure or cable transmission failure?
Error will cause a warning light

2CAB - Lambdaprobe 2 befor catalyst, temperature

All the codes seem to related to bank 2. Recently i replaced injectors 4-6. Car shakes alot at idle. No MHD, car completely stock

[vtl]

Did you program the injectors with the correct flow values?

[insanesam]

Originally Posted by vtl

Did you program the injectors with the correct flow values?

Yes used INPA to set the values though i don't see how it would relate to o2 sensor faults

[MJ80.]

Originally Posted by vtl

Did you program the injectors with the correct flow values?

I trust my mechanic, but he admits they usually dont do it, i told him i need it done, no questions asked. He assures me they were as i made quite a point of it. Car runs much better, the codes persist though. Can avoid them by not going wot, performance is always unaffected.

[MJ80.]

Originally Posted by insanesam

Yes used INPA to set the values though i don't see how it would relate to o2 sensor faults

Injectors play massive role in o2 issues, thats why they were my first step, even if it hasnt resolved the problem it was the most likley.

[insanesam]

Originally Posted by MJ80.

Injectors play massive role in o2 issues, thats why they were my first step, even if it hasnt resolved the problem it was the most likley.

I replaced my bank 2 injectors and bank 2 pre-cat o2 sensor, replaced all spark plugs and all coils. So i'm stumped atm since the codes are pertinent to bank 2 o2 sensor. What else can be the culprit or potentially needs replacing?

[insanesam]

Can vacuum leaks cause these issues? One of my boost solenoids has a broken nipple which was glued back, but i don't think its 100% air tight.

[Ken Oath]

From BMW Technician Diagnostic Trouble Codes (DTC's)

0x2C3E - Short circuit in Quantity control valve.

The diagnostic function monitors the flow control valve control activation wire for shorts to ground.

Potential problem source:
- Defect in plug or wiring harness between DME and flow control valve, Defective flow control valve
- Defective DME

Bank 2 pre cat is toward the rear of the engine.

[CYL]

Just wonder why all of a sudden these O2 sensor will come on?
These sensors would become faulty at a certain mileage?

[insanesam]

Originally Posted by Ken Oath

From BMW Technician Diagnostic Trouble Codes (DTC's)

0x2C3E - Short circuit in Quantity control valve.

The diagnostic function monitors the flow control valve control activation wire for shorts to ground.

Potential problem source:
- Defect in plug or wiring harness between DME and flow control valve, Defective flow control valve
- Defective DME

Bank 2 pre cat is toward the rear of the engine.

Would this imply that the fuse for the o2 sensor has been fried?

[MJ80.]

I took this log this morning.

http://www.datazap.me/u/mj80/log-149...15-16-21-22-23

From what other members have told me my AFRs are all fucked up and my stft isnt being adjusted.

Any ideas ? Ive done alot of reading about guys with these sorts of codes like the OP and mine and rarely are solutions found.

[insanesam]

Not sure if this is a pure coincidence but my car didn't start this morning. I have bit over 1/8 of a tank left of fuel. Cranks fine but fails to start

[vtl]

You'll need better diagnostics tools like INPA

There you can check the voltage of the pre cat bank 2 O2 sensor (grey cabled O2) and see if the heating element is working. From the codes thrown it looks like theres a wiring issue, but its hard to tell from just the codes.

When the car throws a code there is a ton of associated data stored along with it. If you read the codes with INPA it should give you a LOT more information than just a vague code.

[insanesam]

Originally Posted by vtl

You'll need better diagnostics tools like INPA

There you can check the voltage of the pre cat bank 2 O2 sensor (grey cabled O2) and see if the heating element is working. From the codes thrown it looks like theres a wiring issue, but its hard to tell from just the codes.

When the car throws a code there is a ton of associated data stored along with it. If you read the codes with INPA it should give you a LOT more information than just a vague code.

I did use INPA and they were the codes that came up.
2C3E Lambda probe in front of catalytic converter 2, Line cable cable or transmission error transmission.
I'll trace the wires tonight and see if anything obvious comes up.
I'll firstly look at where the sensor connects to the harness to see if there is any corrosion/frayed wires etc. Any other places I should be looking? Does the harness lead to the DME box?

I'll inspect the log in INPA in more detail. Can you advise how to get to that menu? Is it the error code history?

[vtl]

Originally Posted by insanesam

I did use INPA and they were the codes that came up.
2C3E Lambda probe in front of catalytic converter 2, Line cable cable or transmission error transmission.
I'll trace the wires tonight and see if anything obvious comes up.
I'll firstly look at where the sensor connects to the harness to see if there is any corrosion/frayed wires etc. Any other places I should be looking? Does the harness lead to the DME box?

I'll inspect the log in INPA in more detail. Can you advise how to get to that menu? Is it the error code history?

The plugs for the O2 sensors go to the top of the engine underneath the plastic engine cover. The harness then goes from there to the DME enclosure.

In INPA, open up MSD80 and go into read error memory detail and post the full error code with ascociated data, save the file to text, run it through google translate and post it here. Do not take a photo of the laptop screen like so many people do.

INPA you can go into MSD80 and read status values and see if they look right

[insanesam]

Originally Posted by vtl

The plugs for the O2 sensors go to the top of the engine underneath the plastic engine cover. The harness then goes from there to the DME enclosure.

In INPA, open up MSD80 and go into read error memory detail and post the full error code with ascociated data, save the file to text, run it through google translate and post it here. Do not take a photo of the laptop screen like so many people do.

INPA you can go into MSD80 and read status values and see if they look right

thanks for that.
you read my mind, i'll put my camera away.

[insanesam]

Been doing some extra research. Thing to point out is I'm using the Bosch 17098 sensor for bank 2 (through meant for bank 1, the consensus is that it will work for bank 2). Apparently there is a pink switch inside the connector that you can set to either open or close. Does anyone have any idea what this is?

[insanesam]

Well i bought a jerry can with 5 litres of fuel. Pour it in thinking my car will at least start.
Well it cranks but does not start. I now have over 1/4 of fuel so i don't think thats the issue. I connected up INPA to scan for codes and now i have an extra code 29DB. During this time when scanning the car, the low battery indicator decides to turn on. Is this a HPFP issue or battery?

[insanesam]

I now get a battery charge level low warning whilst trying to scan for codes. No new codes for now. I tried jump starting the car but still won't start. I'm thinking either battery, starter motor or HPFP. Anyone with suggestions?

[MJ80.]

Having a battery on the way out plays havoc on these cars, id say given the lack of a start and the low bat code id start with the battery lol.