[cole92ton]

I'll just jump right in. I was having bank 2 O2 sensor codes for awhile, "2C32 Lambda control 2" and "2C28 Oxygen sensor before catalytic converter". After replacing the bank 2 O2 sensor and having no affect, I eventually found the issue to be a leaky injector in cylinder 5 that I had replaced at my dealership under warranty.

On my way home from the dealership my SES light popped back on, same two codes as before so I figured I had ruined that O2 sensor as well (the car was running rich and had covered the sensor with what looked like carbon soot).

I replaced the O2 sensor once again hoping for a permanent fix, yet the SES light came back on last night with the exact same lambda control 2 code after about 30 miles of driving after sensor replacement and clearing the codes. I recorded my additive (short term) and multiplicative (long term) fuel trims at idle, additive stayed at 0.0% (which is normal to my knowledge) and my multiplicative in bank 1 was around 6.7-6.8%, and bank 2 was around 10.0-10.1%, which I believe is considered lean. I have catless dp's which I installed myself and have inspected the v-band clamp multiple times and cannot find an exhaust leak yet I always slightly seem to hear one. I'm out of ideas and could use help of any kind, thanks in advance.

[mweisdorfer]

Originally Posted by cole92ton

I'll just jump right in. I was having bank 2 O2 sensor codes for awhile, "2C32 Lambda control 2" and "2C28 Oxygen sensor before catalytic converter". After replacing the bank 2 O2 sensor and having no affect, I eventually found the issue to be a leaky injector in cylinder 5 that I had replaced at my dealership under warranty.

On my way home from the dealership my SES light popped back on, same two codes as before so I figured I had ruined that O2 sensor as well (the car was running rich and had covered the sensor with what looked like carbon soot).

I replaced the O2 sensor once again hoping for a permanent fix, yet the SES light came back on last night with the exact same lambda control 2 code after about 30 miles of driving after sensor replacement and clearing the codes. I recorded my additive (short term) and multiplicative (long term) fuel trims at idle, additive stayed at 0.0% (which is normal to my knowledge) and my multiplicative in bank 1 was around 6.7-6.8%, and bank 2 was around 10.0-10.1%, which I believe is considered lean. I have catless dp's which I installed myself and have inspected the v-band clamp multiple times and cannot find an exhaust leak yet I always slightly seem to hear one. I'm out of ideas and could use help of any kind, thanks in advance.

Did you replace the turbo seals ?

[cole92ton]

Originally Posted by mweisdorfer

Did you replace the turbo seals ?

No I have not, I do have an oil leak from a bad seal though.

[mweisdorfer]

Originally Posted by cole92ton

No I have not, I do have an oil leak from a bad seal though.

I'd probably fix that given the cost of new turbos.

I assume you replaced the gaskets that connect the downpipes to the exhaust pipes.

Cylinder 5 I think is somewhat common. My injector in cylinder 5 died two months ago after 153,000 miles. I replaced all 6 injectors. All four of my O2 sensors are new with in the last 30,000 miles.

You are running a tune correct ?

[cole92ton]

Originally Posted by mweisdorfer

I'd probably fix that given the cost of new turbos.

I assume you replaced the gaskets that connect the downpipes to the exhaust pipes.

Cylinder 5 I think is somewhat common. My injector in cylinder 5 died two months ago after 153,000 miles. I replaced all 6 injectors. All four of my O2 sensors are new with in the last 30,000 miles.

You are running a tune correct ?

Yes I replaced the flanges that connect the downpipes to the mid-pipe of the exhaust. I also am running an MHD Stage 2 tune.

Originally Posted by mweisdorfer

I assume you replaced the gaskets that connect the downpipes to the exhaust pipes.

Extremely unlikely that those are the problem...peeps have reused those gaskets over and over again without issue.

How do the rest of the injectors look OP?

Logs?