NOX SYSTEM status AFTER 1 YEAR BMW E91 engine N43
#NoxSystem # #NoxSensor #ExhaustLeak #30EA #2AF9 #BMWE90 #BMWN43

00:00 Intro
The car has been working fine for about a year now!
The statutory annual inspection must be done on the car this month
Before that, let's see what the situation is right now!
What is the situation with the NOX system?
00:14 Found NOX sensor fault or Exhaust pipe leak?!
2AF9 nox sensor, nox signal: coast mode check
Let's take a closer look at the fault code with ISTAD and INPA
Diagnose BMW MSD80 DME with INPA software
Read the error code history from 277696km to 285125km
Delete history of error codes
Let's take a closer look at the initial adaptation values
Offset type adaptations are ok within 0.99 .. +0.99 mg/stk range
(for N43) and different from 0.00
Check the desulfurization level of the NOX system ( Shift + F3 )
Desulfurization level is ok at the moment ( 391mg )
Injectors menu... ( Shift + F6 )
Learnbits are ok
Chemical efficiency tests of injectors in Homogeneous mode
The differences in the measurements are fine!
Injectors stratified charge menu...
The Stratified charge values are ok in idle and partial load!
04:35 Test run with INPA monitoring
Let’s take a closer look at the fuel mixture menu
while the car is running
Injectors mechanical efficiency and flow rate are ok
Lambda probes are heated (This N43 motor has 3 lambda probes)
Stratified charge mode works
NOX sensor menu... ( Shift + F2 )
NOX sensor goes to online and starts report lambda values
Trimming of Lambda probes starts
After this, the stratified charge mode should start working!
Unknown fault location: P127A NOx Sensor Signal (Bank 1)
For this reason, the Stratified charge mode does not turn on!
Fault code 2AF9
That potential exhaust leak needs to be investigated further
Delete fault codes and let see if stratified charge mode goes on...
No fault codes at the moment...
11:28 Clean NOX sensor
I can't find any leaks in the exhaust?!
Maybe the NOX sensor still needs to be checked and cleaned!
The NOX sensor would seem to be just fine visually
13:16 Test run after cleaning NOX sensor
One more test run and see if any fault codes appear
Stratified charge mode works when there is no fault code
associated with the NOX system!
Poisoning level of NOX catalytic converter on 423mg
Two weeks later! Let's check the error codes again!
Same error code again: Exhaust leak fault 2C7F! As well as 30EA!
14:45 Perform a forced burning run for NOX catalytic converter with INPA
The temperature must be above 580 degrees
for the burning run to begin and the lambda to change to 0.96!
No error codes! Let's see how it goes in the annual inspection ...


Let’s continue with the next episode! Stay tuned!


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Watch whole BMW E91 with N43 Diagnosis & Maintenance SERIES from here:
   • BMW E91  Diagnosis and maintanence  

Also N43 MOTOR rebuild SERIES from here:
   • BMW E91 N43 MOTOR REBUILD [ REEDIT 2...  

Also POWERDRAIN rebuild SERIES of BMW E91 with engine N43!
See the whole SERIES from here:
   • BMW E91  DRIVETRAIN REBUILD series  


My purpose is to encourage people to do things themselves!
Plus, this is a nice hobby for myself and at the same time I have the opportunity to save a lot of money by doing all the maintenance myself!
I’m not a professional with cars or motorcycles, I just want to learn how to do things myself.
If you do this service yourself, always check the correct instructions in the official service manuals. This is just my way of doing it!

Jani Voutilainen

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References:
https://bimmerprofs.com/msd80diagnos...

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