[gatorheel]

Car: n54, ams intercooler, er cp, cobb stage 2+ (sport), alpina flash, bms catless downpipes, dci. ~40,000 miles.

Issue: went WOT the other day and got the following codes
- P114D
- P0041
- P2C74
- P2C6A

No performance issues.

Appears to be telling me my o2 sensors are swapped but downpipes have been on a for a long time and no codes showed up. Maybe o2 sensors gone bad? I did use the bms downpipe fix for like 300 miles so maybe i need to reset adaptations or something? not sure.

Thoughts? Any trouble shooting advice would be helpful. Thanks.

[mweisdorfer]

Use a quality scan tool like an actron 9580. It will tell you which O2 sensor is bad. Also, you can do an actual read of your O2 sensors when the engine is on. I believe the pre-cat's should fluctuate a lot and the downstream O2 sensors should remain constant (relatively).

[gatorheel]

Originally Posted by mweisdorfer

Use a quality scan tool like an actron 9580. It will tell you which O2 sensor is bad. Also, you can do an actual read of your O2 sensors when the engine is on. I believe the pre-cat's should fluctuate a lot and the downstream O2 sensors should remain constant (relatively).

I have a BT tool and Inpa on my computer. Either of those work for this?

[gatorheel]

Originally Posted by mweisdorfer

Use a quality scan tool like an actron 9580. It will tell you which O2 sensor is bad. Also, you can do an actual read of your O2 sensors when the engine is on. I believe the pre-cat's should fluctuate a lot and the downstream O2 sensors should remain constant (relatively).

Thoughts? Used Inpa and BT tool to take readings. Inpa reading didn't look great as voltage went into red and was varied greatly from bank to bank

[WilliamS]

When did you put on the downpipes? Are you 100% that the sensors are in the right banks?

[gatorheel]

sorry dont think pictures went through on iphone app.

here are a few of the screens from inpa:
1) digital measurement block - nothing off from what i can tell
2) rough running - nothing off from what i can tell
3) lambda measurement block - things looking funky.
- a) pre cat voltage goes into red and voltage drops entirely from post cat sensors
- b) post cat voltage seems to be going to one bank or the other (e.g. all voltage in
1 bank and limited to none in second bank)

i was just in the ECU installing the bms downpipe fix (i am running cobb) so there is a possibility that i swapped the yellow wires maybe (?). I am going to go back in and check the wire positions today to make sure everything was put back together correctly.

re: downpipes, i have had these on for a long while w/ no issues.