MAF actual still low after replacing sensor Passat B6 2.0 TDI CR

   #1  

Wvwzzz

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Lately my car has felt as if its underpowered, especially in the lower RPM range, it definetly didn't feel like it did when I test drove it prior to buying.

After unplugging the MAF the car ran significantly better, but just to make sure I logged the RPM, MAF specified vs MAF actual while revving the car to the limiter at a stand still.

Today I put in a new MAF sensor, brand new and genuine Bosch that matches the part number on the factory VW one. While the car feels slightly better I connected VCDS to read the values again and to my surprise they are no different. Same test, same place, revved to the limited 3 times while at operating temp.

Another thing is that before I replaced the MAF the car felt more hesitant and I would get vibration while clutching out without throttle in first gear to move off. With the new MAF this has dissappeared and the car feels more confident to move off.

What could the issue be? Can anyone explain why this is happening or am I doing something wrong?
 
   #2  

Wvwzzz

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At 3000 RPM MAF specified reads 910 mg/str vs MAF actual 455 mg/str
 
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Wvwzzz

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Code:
Mileage: 242850km-150899mi   Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 3C-VW46 (3C0)
Scan: 01 03 08 09 15 16 17 19 25 42 44 46 52 53 56 62 72 77

VIN: WVWZZZ3CZAP020283   Mileage: 242850km-150899miles

01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
56-Radio -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (CBD)       Labels: 03L-906-022-CBA.clb
   Part No SW: 03L 906 022 BT    HW: 03L 907 309
   Component: R4 2.0l TDI G000SG  9977 
   Revision: 13H02---    Serial number: VWZCZ000000000
   Coding: 0000071
   Shop #: WSC 00001 067 57207
   VCID: 78A9E3611ED8A54BB73-802C

No fault code found.
Readiness: 0 0 0 0 0

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels:. 3C0-614-109-C4.clb
   Part No SW: 3C0 614 109 AF    HW: 3C0 614 109 AF
   Component: J104    C4 440 V2   0015 
   Revision: --025---    Serial number: 00000795607791
   Coding: 0003332
   Shop #: WSC 00028 790 00005
   VCID: 629DA109A8445F9BF97-8036

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 1K0-820-047.lbl
   Part No SW: 1K0 820 047 JP    HW: 1K0 820 047 JP
   Component: Climatic PQ35   143 1515 
   Revision: 00143034    Serial number: 00000000000000
   Shop #: WSC 00000 000 00000
   VCID: 7BA3FC6D2FEE8E53DA1-802E

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels:. 3C0-937-049-30-M.lbl
   Part No SW: 3C8 937 049 D    HW: 3C8 937 049 D
   Component: Bordnetz-SG     H54 2602 
   Revision: 00H54000    Serial number: 00000006060018
   Coding: A0808F0700041A00470A00000F000000000959435C000120000000000000
   Shop #: WSC 00028 028 00001
   VCID: 323D1149B8248F1B497-8066

   Subsystem 1 - Part No: 3C2 955 119 B  Labels: 1KX-955-119.CLB
   Component: Wischer 300809 022  0601 
   Coding: 00046997
   Shop #: WSC 00028 

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 5N0-959-655.lbl
   Part No SW: 5N0 959 655 J    HW: 5N0 959 655 J
   Component: J234__00J VW10 HI   1916 
   Revision: 20013000    Serial number: 003E2PJSCZ9I 
   Coding: 0012362
   Shop #: WSC 00028 790 00005
   VCID: 44D14791129031ABEBB-8010

   Subsystem 1 - Serial number: 6332MTS667752449

   Subsystem 2 - Serial number: 6342MTS634472579

   Subsystem 3 - Serial number: 6351HTS61T2Q09KJ

   Subsystem 4 - Serial number: 6361HTS6DS6N09KR

   Subsystem 5 - Serial number: 00000000000000000

   Subsystem 6 - Serial number: 00000000000000000

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 3C0-953-549-SW25.lbl
   Part No SW: 3C0 953 549 AK    HW: 3C0 953 549 AK
   Component: J0527               0030 
   Revision: 00032000    Serial number: 3C5953507CP  
   Coding: 0000511
   Shop #: WSC 00028 028 00001
   VCID: 75B7EA5509CAD823AC5-8020

   Subsystem 1 - Part No: 3C8 959 537 D  Labels: 3C8-959-537.CLB
   Component: E221__MFL-TK6   H05 0022 
   Coding: 00000226
   Shop #: WSC 00000 

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 3C8-920-xxx-17.clb-SRI1
   Part No SW: 3C0 920 972 D    HW: 3C0 920 972 D
   Component: KOMBI         H02 0206 
   Serial number: 00000000000000
   Coding: 160F00
   Shop #: WSC 00028 028 00020
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04040
   ROD: EV_Kombi_UDS_VDD_RM09_004_VW46.rod
   VCID: 270BF01D8F66FAB3EE9-8072

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 3C0-907-530-V3.clb
   Part No SW: 3C0 907 530 L    HW: 3C0 907 951
   Component: J533__Gateway   H13 0152 
   Revision:   H13       Serial number: 3300P099090940
   Coding: F9807F06000602001003
   Shop #: WSC 00028 028 00001
   VCID: 2A0D092990F4C7DBF17-807E

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 3C0-959-433-25.clb
   Part No SW: 3C0 959 433 AR    HW: 3C0 959 433 AR
   Component:    IMMO         043 0383 
   Revision: 00043000    Serial number: VWZCZ000000000
   Shop #: WSC 87005 210 91847
   VCID: 7AADF96920D4B75BC17-802E

   Subsystem 1 - Part No: 3C0 905 861 G
   Component:    ELV          027 0380
   3C0905861G     ELV          027 0380  

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels:. 1K0-959-701-MIN3.clb
   Part No SW: 1K0 959 701 AR    HW: 1K0 959 793 N
   Component: J386  TUER-SG FT    1502 
   Revision: 72009005    Serial number: 00000525998911
   Coding: 0000693
   Shop #: WSC 00028 028 00001
   VCID: 7EA5F5793CFC9B7BFDF-802A

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1K0-909-14x-GEN3.clb
   Part No: 1K0 909 144 H
   Component: EPS_ZFLS Kl. 195    2901 
   Revision: 00H17000   
   Shop #: WSC 00028 028 00001
   VCID: 2F3B183DAB16A2F3269-807A

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 3C0-959-433-46.clb
   Part No SW: 3C0 959 433 AR    HW: 3C0 959 433 AR
   Component:    KSG PQ46 ELV 043 0612 
   Revision: 00043000    Serial number: VWZCZ000000000
   Coding: 59910A0001860E7630049C1D70085FCE107C01
   Shop #: WSC 87005 210 91847
   VCID: 7AADF96920D4B75BC17-802E

   Subsystem 1 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HORN H05 1501

   Subsystem 2 - Part No: 3C0 951 171 C
   Component: Neigungssensor  004 0611

   Subsystem 3 - Part No: 3C0 951 171 C
   Component: Innenraumueberw.004 0611

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels:. 1K0-959-702-MIN3.clb
   Part No SW: 1K0 959 702 AR    HW: 1K0 959 792 N
   Component: J387  TUER-SG BT    1502 
   Revision: 72009005    Serial number: 00000767498914
   Coding: 0000692
   Shop #: WSC 00028 028 00001
   VCID: 7F5B087D3BF69273F69-802A

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake        Labels: 5N0-907-801.clb
   Part No SW: 3C8 907 801 E    HW: 3C8 907 801 E
   Component: J540 EPB3  VW-15417 0007 
   Revision:   010       Serial number: 00000000027377
   Coding: 0000057
   Shop #: WSC 00028 028 00001
   VCID: 2C010F319A00D9EB03B-8078

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J503)       Labels:. 5M0-035-1xx-56.clb
   Part No SW: 1K0 035 186 AA    HW: 1K0 035 186 AA
   Component: Radio RCD310  013 0036 
   Revision: 01000000    Serial number: VWZ1Z2I6710731
   Coding: 0500040004
   Shop #: WSC 00028 028 00001
   VCID: 6597BA15B56A28A31C5-8030

3 Faults Found:
00870 - Bass Speaker Front Left (R21)
            011 - Open Circuit
             Freeze Frame:
                    Fault Status: 01101011
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 4
                    Mileage: 241341 km
                    Time Indication: 0
                    Date: 2015.10.07
                    Time: 20:03:37

00856 - Radio Antenna
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 5
                    Fault Frequency: 26
                    Reset counter: 85
                    Mileage: 241341 km
                    Time Indication: 0
                    Date: 2015.10.07
                    Time: 20:01:42

03138 - Input AUX IN
            011 - Open Circuit
             Freeze Frame:
                    Fault Status: 01101011
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 4
                    Mileage: 241341 km
                    Time Indication: 0
                    Date: 2015.10.07
                    Time: 20:01:37


-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels:. 1K0-959-703-GEN3.clb
   Part No SW: 1K0 959 703 AB    HW: 1K0 959 795 L
   Component: J388   TUER-SG HL   0308 
   Revision: 41004101    Serial number: 00000001088569
   Coding: 0000144
   Shop #: WSC 00028 028 00001
   VCID: 70B9DB4176A8FD0B7F3-8024

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels:. 1K0-959-704-GEN3.clb
   Part No SW: 1K0 959 704 AB    HW: 1K0 959 794 L
   Component: J389   TUER-SG HR   0308 
   Revision: 41004101    Serial number: 00000001091711
   Coding: 0000144
   Shop #: WSC 00028 028 00001
   VCID: 71BFDE457DA2F40370D-8024

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone (J412)       Labels:| 3C8-035-730-A.clb
   Part No SW: 3C8 035 730 C    HW: 3C8 035 730 C
   Component: Telefon       012 0822 
   Revision: --------    Serial number: 35909603519160
   Coding: 020000010100010000000000
   Shop #: WSC 12345 123 12345
   ASAM Dataset: EV_UHVPremi A02705
   ROD: EV_UHVPremi_A02.rod
   VCID: 2313E40DFB5E1693B21-8076

No fault code found.

End----------(Elapsed Time: 01:21, VBatt start/end: 14.1V/14.1V)-----------
 
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   #4  

stefdds

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Greetings, please post a Autoscan and the community will take a look!

looks like you beat me!

Presuming you didn't clear any existing codes before you posted this AS , the only thing that comes to my mind regarding your MAF diagnostic is the flap / air metering system in the intake manifold (perhaps partially open or closed or stuck ?) I'm not familiar with the TDI's , but I'm sure you will get some reply's from members who have this platform/engine.
 
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   #5  

Wvwzzz

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Already uploaded :)
 
   #6  

Uwe

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Have you checked that manifold pressure ("boost") is up to snuff?

-Uwe-
 
   #7  

Wvwzzz

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Yes, done full log at various speeds and seems to be a good match. Mind you the turbo has been replaced last year.
 
   #8  

HMC

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Hi Wvwzzz or should I call you VINny ? :)
I think i would be looking at complete airflow, so is induction restricted, is exhaust partially blocked? Is the EGR stuck partially open? Is there excess smoke?
Regards HMC
 
   #9  

Wvwzzz

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Haha ;D
Well, theres no smoke, DPF has been fully cleaned and restored to factory spec, so was the cat as they are in the same housing, I've got a new throttle body that I fitted not long ago and cleaned out the EGR at the same time so I wouldnt think there is a restriction anywhere
 
   #10  

HMC

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In that case where did your new "Bosch" MAF come from?
Regards HMC
 
   #11  

Wvwzzz

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I bought it from the local parts store
 
   #12  

PetrolDave

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I bought it from the local parts store
IIRC there have been examples on here where parts bought from similar places have not been genuine, but Chinese Replacement Auto Parts.
 
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   #13  

Wvwzzz

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I am aware that with MAF sensors its often possible to buy a Bosch housing with the sensor element inside being made in china, however I did check that as well with the original VW one from the car prior to fitting. All part numbers match except obviously the original one having an extra VW and Audi logo
 
   #14  

Wvwzzz

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And yes I've done logs on the turbo at various RPMs and engine loads and the boost actual follows boost specified almost perfectly
 
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