A8 3.3 TDI

Hello.

Unfortunately, I couldn't find anything in the search results.
The following problem:

The fuel consumption has increased significantly from 7.6 liters per 100 km to 12.8 liters per 100 km, despite the same driving style.
It's smoking very heavily, black smoke, when accelerating.

VAG-COM Version: Release 512.4

No errors found on engine control units 1 and 2.

What could it be?

Regards,

Dejan.

Audi A8, year 2000, engine type: AKF.

Black smoke? Sounds like a lack of oxygen. What do the air quality readings say?

Please provide a complete diagnostic report (auto-scan) from the vehicle.

At full load, in gears 3, 4, and 5, the values are:

010: 850mg/hub, 989mbar, 2121 mbar, 100% load.

I've already replaced the mass airflow sensors; both are now new and genuine Bosch parts.

Best regards, Dejan.

That's not the point; I'm interested in the software versions of the control units and everything else related to that. With that in mind, it would be helpful if you could post a car scan report sometime.

There is an error in the engine control unit (ECU). Here is the entire diagnostic report.

VAG-COM Version: RKS 512.3-UD

Sunday, June 18, 2006, 3:08:14 PM.

Type: 4D - Audi A8 D2 1994>2002
Scan: 01 02 03 08 11 15 16 17 18 25 35 37 45 55 56 57 65 67 75 76
77
Chassis number: WAUZZZ4DZ1N003478

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 01: Engine.
Control unit: 4D0 907 409 A
Component: 3.3l/4VTEDC G400AG D03
Encoding: 00016
Workshop code: WSC 02313.
WAUZZZ4DZ1N003478 AUZ7Z0Y1489609

"One error found:"
17567 - Signal from air mass sensor 1 / air mass sensor 2: implausible ratio.
P1159 - 35-10 - - - Intermittent.
Self-test: not available.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 02: Automatic Transmission.
Control unit: 4D0 927 156 AA
Component: AG5 01L 3.3l TDI, Roadworthy Inspection Code 1517.
Encoding: 00001
Workshop code: WSC 02313.

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 03: ABS Brakes.
Control unit: 4D0 907 389 E
Component: ABS/ESP all-wheel drive D46.
Encoding: 08357
Workshop code: WSC 02313.

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Adresse 08: Auto. Climate.
Control unit: 4D0 820 043 Q
Component: A8 Climate Control System D12.
Encoding: 00083
Workshop code: WSC 02313.

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 11: Motor II
Control unit: 4D0 907 409 B
Component: 3.3l/4VTEDC 0000AG D03
Encoding: 00016
Workshop code: WSC 02313.

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 15: Airbag.
Control unit: 4D0 959 655 T
Component: Front and Head Airbag - 3000.
Encoding: 00417
Workshop code: WSC 02335.

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 17: Combination instrument.
Control unit: 4D0 919 882 AX
Komponente: D2-KOMBIINSTR. VDO D29
Encoding: 00080
Workshop code: WSC 49905.
WAUZZZ4DZ1N003478 AUZ7Z0Y1489609

2 errors found.
01303 - Transmitting and receiving device for telephone (R36).
49-00 - No communication.
01327 - Parking assist control unit (J446)
49-00 - No communication.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 18: Auxiliary/standing heating.
Control unit: 4D0 815 071 B
Component: Diesel auxiliary heater D49.
Encoding: 00002
Workshop code: WSC 02313.

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 25: Departure speed.
Control unit: bit address teA.
Component: Enter "e 17".

No errors found.
or errors that are not supported by the control unit.
or communication errors.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 35: Central Storage.
Control unit: 8L0 862 257 G
Component: Circulation pump, domestic water system, wireless D16.
Encoding: 15179
Workshop code: WSC 02313.

6 errors found:
01372 - Alarm triggered by door contact switch at the rear/passenger side.
35-00 - -
01370 - Alarm triggered by interior monitoring system.
35-00 - -
01369 - Alarm triggered by hood switch.
35-00 - -
00991 - Interior lighting.
28-00 - Short circuit to positive.
00955 - Key 1
09:00 - Adaptation limit exceeded.
00956 - Key 2
09:00 - Adaptation limit exceeded.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 37: Navigation.
Control unit: 4D0 035 192 H
Component: Navigation
BNO 0017

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 45: Interior Monitoring.
Control unit: 4D0 951 177 B
Komponente: Innenraumueberw. D06
Encoding: 00001
Workshop code: WSC 00000

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 55: Xenon.
Control unit: 4B0 907 357 C
Component: Dynamic LWR D03.
Encoding: 00001
Workshop code: WSC 131071.

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 56: Radio.
Control unit: 4D0 035 192 H
Component: Radio; BNO 0001.
Encoding: 00117
Workshop code: WSC 74004.

No errors found.

"Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Feld und lässt das Gras sanft wiegen. Es ist ein wunderschöner Tag."

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze blows through the field, causing the grass to sway softly. It's a beautiful day.
Address 76: Parking assist.
Control unit: 4D0 919 283
Component: Parking system A8 RDW D07.
Encoding: 01108
Workshop code: WSC 00000

No errors found.

Sure, here is the translation of the text from German to English:

"End"

Dann dann wirds doch schon klarer.

Log MWB 003.

MWB 003.2 = Air mass (total).
MWB 003.3 = Air mass (Mass airflow sensor G70).
MWB 003.4 = Air mass (LMM2 G246).

...and at the end, could you please contact me directly via email?

MWB 003.1 = 643 rpm.
MWB 003.2 = 545.2 mg/vial.
MWB 003.3 = 361.9 mg/vial.
MWB 003.4 = 80.1%

Welchen LMM hast du jetzt verbaut? Part number?

057-906-461-C(X)?

G246 = 465.3 mg/dose.
G70 = 690.2 mg/dose.

idle speed: total = 361.9 mg/stroke.
at 3000 RPM = 521.7 mg per cycle.

I installed this one: Bosch part number 0 281 002 435.

opelfreak wrote:

I installed this one: 0 281 002 435, which is a Bosch part number.

When translated to the Volkswagen part number, it would be 057-906-461-C, which is correct.

Have you checked the entire intake air path for any leaks (unmetered air)?
Are the LMM connectors okay?

"The LMM connectors are like new, with no visible problems. The intake air passages are also fine (no leaks). It's possible that the mass airflow sensor is faulty."

Damn... my fault. Your control unit has data version D03, where parameter byte (MWB) 003 is defined differently. The list above for MWB 003 only applies starting with data version D05.

As of data status D04, record MWB 003 is populated with the following information:

MWB 003.1 = Engine speed.
MWB 003.2 = Air mass (target).
MWB 003.3 = Air mass (is).
MWB 003.4 = Control of EGR valve(s).

As of data version D05, record MWB 003 is populated as follows:

MWB 003.1 = Engine speed.
MWB 003.2 = Air mass (total).
MWB 003.3 = Air mass (Mass airflow sensor G70).
MWB 003.4 = Air mass (LMM2 G246).

Für alle Datenstände sollte MWB 025 gelten, sprich du musst nochmal protokollieren.

MWB 025.1 = Engine speed.
MWB 025.2 = Boost pressure.
MWB 025.3 = Air mass (LMM1 G70).
MWB 025.4 = Air mass (LMM2 G246).

MWB 025.1 = 643 rpm.
MWB 025.2 = 996.6 millibars.
MWB 025.3 = 465.3 mg/vial (LMM1 G70)
MWB 025.4 = 263.2 mg/vial (LMM2 G246)

MWB 025.1 = 2999
MWB 025.2 = 1407
MWB 025.3 = 578.4 mg/vial (LMM1 G70)
MWB 025.4 = 535.8 mg/vial (LMM2 G246)

Furthermore, you should check the exhaust gas recirculation system. Up to data version D04, the process is as follows:

Default setting > MWB 003.

MWB 003.2 = AGR Status.
MWB 003.3 = Air mass.
MWB 003.4 = Control of EGR valve(s).

For "AGR aktiv" (MWB 003.2), use between 100-200 mg/H.
"AGR not active" (MWB 003.2), with a value between 370-480 mg/H.

If the value for "AGR not active" is within the expected range, proceed as follows:

Check the actual value when "AGR active" is enabled.
"If the target value is now reached, check the boost pressure control."
If the target value cannot be reached, replace the EGR valve(s).

If the value for "AGR not active" is outside the expected range, proceed as follows:

> Close the EGR valve mechanically.
< If the target value is now reached = replace the EGR valve(s).
"If the target value is still not reached, check the boost pressure control."