Beiträge von Cornball

What seems to be the problem? Translators usually make mistakes especially with technical wording.

If you don't have anything constructive advice, skipping a thread is free.

Pointless reply.

Hello again

Not long ago I fixed my DPF issue.

Now I have following DTC;
244B00 - Charging pressure control, low-pressure stage: Charging pressure too high

This code comes every time the same. When giving the car full beans and changing gear approx. 180km/h. This fault occurs and car goes to limp mode.

With ISTA, every test related to turbo and intake stuff PASSED. One thing seemed odd. I don't recall the test name, but it checks the charging pressure with different RPMS and moves the turbo flaps around?
It kept RPM @ 3000, and the car juddered a lot at the same time. Should this be part of the test?
Also in Live Data this seems a bit odd?
760: Variable turb. geometry controller actual value low pressure: 74.88%
761: Variable turb. geometry controller setpoint value low pressure: -1.11%

762: Variable turb. geometry controller actual value high pressure: 87.83%

763: Variable turb. geometry controller setpoint value high pressure: 0.76%

305600 - Oxygen sensor after catalytic converter, plausibility: Lambda value too low in coasting overrun mode.

This fault does not trigger anything. And "present" value of the code is always "no".
After deleting fault memory I checked live data which said the following;
Ox sens. before cat Air ratio: 0.25
Ox sens. after cat Air ratio: 4.08
This was a brief fast check at idle.

22B100 - Diesel particulate filter: Efficiency too low.
This fault comes back every time when I delete fault memory.
Differential pressure is ok, DPF regeneration is working. This code does not trigger drivetrain fail.

Any help? The car has been stage 1 tuned. It smokes a tiny bit at full throttle under certain conditions.
I have not tried accelerating to 180km/h + before the tune. So hard to say is the boost problem from the remap.

Update / Solution found

I finally figured out why my DPF temperature would never go above ~110°C even after replacing both the DPF and CAT EGT sensors with genuine BMW parts.

The issue was not the sensors at all – it was the wiring.

At some point in the car’s history, someone who should not work on cars had connected the DPF temperature sensor connector to the EGR temperature sensor, and the EGR temp sensor connector to the DPF sensor. The connectors fit each other and the wiring lengths are long enough, so it looks “correct” even though it isn’t. This was a bit hard to diagnose but after hitting my head against the wall for some time I started to look up everything on ISTA and saw that the sensor wiring is totally different on my car.
DPF temp. sensor connector is located back of the engine, under the DPF differential pressure sensor. EGR connector about half way of the valve cover, both on exhaust side of the engine.
Because of this:

• The DPF temp reading in ISTA was actually the EGR temp
• The DPF never “reached” regeneration temperature (ECU thought it was stuck at 50–110°C)
• Regeneration was impossible because ISTA requires at least ~220°C
• The engine behaved strangely at low RPM because the ECU was trying to compensate for the wrong temperature data

After swapping the connectors to their correct sensors, everything immediately started working normally. DPF temps now rise as they should and regeneration is possible again.

So if anyone else has a B57 with low DPF temps and no regen even after replacing sensors, check the wiring – the connectors can be mixed up very easily.

Hello!

2017 G31 540d.

Previous owner had short trips a lot. Mine have been long and I am not afraid of the throttle pedal so to speak.

When I bought the car it had 284C00 and 341D00 - Exhaust gas temp codes from DPF and CAT.

DPF temp would NOT reach above 110C, no matter how I drove. So I ordered BOTH, CAT and DPF temp sensors as genuine BMW parts.
They were a bit of pain in the ... to replace so that's why I changed both at the same time.

Issue is that the problem STILL exists after replacing the sensors.. DPF temp WONT go above 110C no matter what. It hovers around 50-110C when driving. No DPF regen is possible because ISTA says that at least 220C is needed for it..

All other temp sensors seem to be working correctly (SCR, CAT, EGR temps)

Soot mass - 60g but pressure is ~5 HPA on idle? Is that a bit weird?

Any help?