Recurring LMM error on A6 BLB

Hello,

I keep getting the same error message:

Audi A6, 140 hp PD, BLB, Mileage: 215,000 km.

Address 01: Engine Control Unit
Label file: DRV\03G-906-016-BLB.lbl
Control unit part number: 03G 906 016 BF HW: 028 101 185 0
Component and/or version: R4 2.0L EDC G000SG 9553.
Encoding: 0000072
Operating number: WSC 27162 123 80566
Sure, here is the translation of the text from German to English:

'1 error found:'

16485 - Air mass sensor (G70): implausible signal.
P0101 - 000 - -
Environmental conditions:
Speed: 1218 RPM.
Torque: 0.0 Nm
Speed: 49.0 km/h
Temperature: 45.9°C
(no unit): 55.2
(no unit): 1.29
Temperature: 84.6°C


Readiness: 1 1 0 0 0

reset only works for a few kilometers.

'I've replaced the mass airflow sensor (MAF sensor) three times, once with an original Bosch part, once with a generic aftermarket part, and once with a tuning MAF sensor, but I'm still getting the same error message. I've also already replaced the EGR valve.'
The wiring harness looks good, but what else could it be related to?

Thank you and best regards.
Toto.

Hello,

Here are a few things that can cause this error:

Is the intake air path AFTER the mass airflow sensor (MAF) and the engine in good condition? - Is it completely airtight? Are there any cracks or similar imperfections?

Is the air filter clean? Is the intake path *before* the mass airflow sensor (MAF) verschandeln and unobstructed?

Contacts okay? Corrosion?

Measure the circuit.

LMM --> Engine Control Unit (ECU)
4 --> T94/40 black/light gray.
3 --> T94/50 ge/gn
5 --> T94/82 ws/gr
2 --> Connect terminal 15 (black/blue wire) to fuse SB37.

I've checked everything and it's all good and sealed!

Does anyone have any other ideas about what might be causing this?

Thank you.

Hello,

It would have been interesting to know the measured air mass and the boost pressure under the ambient conditions; in that respect, the engine control unit software is somewhat suboptimal.

Please log the relevant operating point for an extended period; I suspect that the air mass values are either too high or too low for the respective boost pressure or EGR rate.

A cable break or a problem with the connector could also be the cause.

Otherwise: Faulty throttle control module / EGR valve, or a cracked/leaking intercooler hose.

Best regards, Rainer.

The intercooler is definitely leaking. Also check the turbocharger to ensure its operation is smooth, and use diagnostic software to check its functionality. And by the time you've replaced the second new mass airflow sensor, you should seriously consider whether the mass airflow sensor is actually the cause of the problem. Only install original Bosch parts or OEM parts. No eBay or aftermarket "tuning" junk. You created the error yourself.
Does the car have full power? Does it smoke? Does it run better with the mass airflow sensor disconnected than with it connected? Is your battery okay?

Remove the valve cover and check if the aluminum plugs are still in place at the front and rear.
'Insert into the pivot lever axles - if not, put in new ones, and it should be gone.'

What aluminum plugs? What does that even have to do with it?


LG

Toto.

Okay, I understand. Please provide the German text you want me to translate into English. I will only provide the translation.

dokatoto wrote:

which aluminum stoppers, what does that even have to do with it???? LG Toto

"Alustopfen" sounds a bit strange.
It should actually be called sealing rivets.
If there is indeed such a significant pressure drop in the ZK (Zylinderkopf, or cylinder head).
Ideally, the players should start practicing their tackling technique before any mistakes occur.

Was the post from a TPI?

I still need some help; I can't seem to fix the error.

So far, the following has been checked: No cracks in the intercooler piping, the EGR valve is only 10,000 km old.
Turbo disassembled and cleaned, full range of motion for the variable turbine geometry (VTG), throttle valve cleaned and functional, aluminum plugs are present, high-pressure fuel pumps (PDEs) reset to their initial position, timing belt replaced and timing meticulously adjusted.

Ping, the light came back on after almost 2 days, and now there's an error message. I'm completely lost.


LG

Toto.