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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > N54 o2 sensors and AFR



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      05-25-2018, 12:38 AM   #1
myultimatemachine
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N54 o2 sensors and AFR

I have had issues with my car throwing o2 sensor codes for bank 2 sensors (both 1 and 2) when the car was stock and now with upgrades.

Firstly, what is the desired AFR for the n54 engine? I've read between 14 and 16.

My current setup:
DCI's from BMS
MHD stage 2+ tune
Catless DPs
Upgraded intercooler
Cobb chargepipe
JB4 psi upgrade (The $200 one) current set to add 2 PSI
Muffler delete
Brand new fuel pumps/filters
New vacuum lines
New BOVs
New plugs/coils
New injectors
Current BMW programning for all modules
New HPFP
New fuel sensors.
Plus lots more....

I dont know what the proper AFR should be but the logs I have seem to indicate the car is way too lean. Can someoje check out the logs and provide input please, as I want to ensure the engine is running in perfect order.

https://datazap.me/u/bimmerswagg/log...og=0&data=3-16

Notice in the log how there are strange spikes, I'm concerned something is wrong with my DME. (I already checked the MOSFETS)
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Last edited by myultimatemachine; 05-25-2018 at 12:57 AM.
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