Emission inspection 2002 A4 B6 1.8T

   #1  

Larhal

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I had my MOT inspection last week and failed emissions.
The following results were logged:
Engine Speed 2500
CO 0.06 Pass
HC 6Ppm Pass
Lamda1.041 Fail (0.97-1.03)

Lamda Indicates that I am running Lean.

I have checked for leaks and found none, PCV working correctly. Very cold here now.

Any Help would be appreciated.

Monitered the followingat Idle:
Code:
   Address 01: Engine  (8E0 909 518 M)

13:48:44 Group 002: General
  760 /min  Engine Speed (G28)
  15.8 %  Engine Load 
  2.04 ms  Injection Timing 
  2.36 g/s  Mass Air Flow Sensor (G70)

13:48:44 Group 031: Lambda Control (Lambda Sensor Voltages)
  1.016  Lambda Control Bank 1 (actual)
  1.000  Lambda Control Bank 1 (specified)
       
       

13:48:44 Group 032: Lambda Control (Mixture Adaptation)
  1.5 %  Adaptation (Idle) Bank 1 Sensor 1
  1.6 %  Adaptation (Partial) Bank 1 Sensor 1

Readiness Status: 0000 0000
Exhaust Gas Recirculation: Passed
Oxygen Sensor Heating: Passed
Oxygen Sensor(s): Passed
Air Conditioning: Passed
Secondary Air Injection: Passed
Evaporative Emissions: Passed
Catalyst Heating: Passed
Catalytic Converter(s): Passed

Autoscan:
Code:
Saturday,11,January,2025,13:57:18:49418
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 24.7.1.0 (x64)  HEX-V2 CB: 0.4658.4
Data version: 20240919 DS356.3
www.Ross-Tech.com

Dealer/Shop Name: LarHal

VIN: WAUZZZ8E32A200477   License Plate: 
Mileage: 251420km-156225mi   Repair Order: 



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


Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))
Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65
          67 69 75 76 77
 
VIN: WAUZZZ8E32A200477   Mileage: 251420km-156225miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06B-906-018-AVJ.lbl
   Part No SW: 8E0 909 518 M    HW: 8E0 909 018 
   Component: 1.8L R4/5VT      01 0001  
   Coding: 0011501
   Shop #: WSC 00000 000 08192
   VCID: 3A2DCF2C6043897A51F-5160
   VINID: 9D196AAAA2150C24420001071CCE5BE79B

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: None
   VCID: 55F77C90EC1D46025CD-51F2

No Faults Found
  or DTCs not supported by controller
  or a communication error occurred

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8E0-820-043.lbl
   Part No: 8E0 820 043 
   Component:   A4 Klimaautomat   0712  
   Coding: 00000
   Shop #: WSC 63351  
   VCID: 5EE563BC992B855A0D7-5160

1 Fault Found:
01809 - Actuating Motor for Temperature Flap; Left (V158) 
            41-10 - Blocked or No Voltage - Intermittent

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 8E0-907-279-8E2.lbl
   Part No: 8E0 907 279 C
   Component: int. Lastmodul  NDL 0203  
   Coding: 00002
   Shop #: WSC 63351  
   VCID: 323DE70CBD33713A99F-4B00

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8E0-959-655-84.lbl
   Part No: 8E0 959 655 
   Component: Airbag 8.4E         4001  
   Coding: 0010602
   Shop #: WSC 63351 000 00000
   VCID: 74B1211402A73F0A4B3-5160

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 8E0-953-549.lbl
   Part No: 8E0 953 549 F
   Component: Lenks ulenmodul     0308  
   Coding: 00001
   Shop #: WSC 63351  
   VCID: 3635DB1C515B6D1AB57-4B00

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8E0-920-9xx-8E2.clb
   Part No: 8E0 920 950 G
   Component: KOMBI+WEGFAHRS. RB4 D26  
   Coding: 00400
   Shop #: WSC 00260  
   VCID: 2D07F470A40D2EC2C4D-5160
   WAUZZZ8E32A200477     AUZ6Z0A0309521

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 8E0-959-433-MIN.clb
   Part No: 8E0 959 433 AD
   Component: Komfortger t T85    0315  
   Coding: 06848
   Shop #: WSC 63351  
   VCID: 73B3220802A93832529-4B00

   Subsystem 1 - Part No: 8E2959802B
   Component: T rsteuer.FS BRM 0002  

   Subsystem 2 - Part No: 8E2959801B
   Component: T rsteuer.BF BRM 0002  

8 Faults Found:
01561 - Rear left door 
            59-10 - Can't Unlock - Intermittent
01561 - Rear left door 
            61-10 - Won't De-Safe - Intermittent
01562 - Rear right door 
            59-10 - Can't Unlock - Intermittent
01562 - Rear right door 
            61-00 - Won't De-Safe
00892 - Switch for Trunk Closing Cylinder (F248) 
            27-00 - Implausible Signal
01559 - Drivers Door 
            61-00 - Won't De-Safe
01802 - Door Warning Lamp; Pass Side (W36) 
            57-10 - Electric Circuit Failure - Intermittent
00933 - Electric Window Motor; Passenger Side (V148) 
            62-10 - No or Incorrect Adjustment - Intermittent

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8E0-035-1xx-56.lbl
   Part No: 8E0 035 186 
   Component: concert II  GRO    0007  
   Coding: 00001
   Shop #: WSC 63351  
   VCID: 64915154B777AF8ADB3-4B1E

1 Fault Found:
01317 - Control Module in Instrument Cluster (J285) 
            49-10 - No Communications - Intermittent

End----------(Elapsed Time: 05:50, VBatt start/end: 12.3V/12.2V)-----------
 
   #2  

TTT

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Dump some injector cleaner in the tank and go rounds.
 
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Larhal

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Did that this morning and took a strong ride with several WOT. All the readings were taken after the run.
 
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TTT

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Wot is not needed, fuel will pass through injectors anyway. What are the fuel trims showing, try in obd mode? Long term and short term.
 
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Uwe

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Could also be an Oxygen (Lambda) Sensor that's old and tired.

-Uwe-
 
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EuroX

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I don't understand why it failed. Spec vs actual is close and there is no codes. Fuel trims look to be in the norm up to 5% is normal.
 
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Uwe

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I don't understand why it failed. Spec vs actual is close and there is no codes. Fuel trims look to be in the norm up to 5% is normal.
I believe they do emissions inspections with an actual exhaust gas analyzer over there rather than depending on the what the car has to say via OBD.

-Uwe-
 
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RGH0

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I believe they do emissions inspections with an actual exhaust gas analyzer over there rather than depending on the what the car has to say via OBD.

-Uwe-
If its being done that way with a probe stuck up the exhaust then if you have a small exhaust joint leak or a small amount of air backflow due to the probe not being stuck in far enough or a loose joint on the probe to sensor being used then a false lean measurement is very possible and nothing to do with the car controls
 
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EuroX

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I believe they do emissions inspections with an actual exhaust gas analyzer over there rather than depending on the what the car has to say via OBD.

-Uwe-
I understand all that but why? if there is no CEL no codes, readiness is set and vehicle shows no signs of modifications why go to those lengths? Sounds like a money grab.
 
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Larhal

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Sorry I am not that keen on some of the diagonistics..What is obd mode please? How can I observe, log this?
 
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Larhal

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Well I know the ttester very well and he knows me also that I do all the work on my car myself. Could be an exhaust leak as I smell somerimes fumes in the car and have not been abke to find the leak. Goes for a retest tomorrow and I will advise him to insert the probe as far up the pipe as possible. I will report back after the test.

Thanks for all the input.
 
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Dr Sheldon

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I don't understand why it failed. Spec vs actual is close and there is no codes. Fuel trims look to be in the norm up to 5% is normal.
Here in the UK the emissions are tested at the tailpipe on Idle and Fast idle with an old school 4 Gas Analyser.

Nothing is done Diagnostically !! Although a MIL illuminated for any reason is a fail !!


I understand all that but why? if there is no CEL no codes, readiness is set and vehicle shows no signs of modifications why go to those lengths? Sounds like a money grab.
That is the prescribed method of testing by the Ministry of Transport.


OH - If you have a Hybrid with a Petrol Engine (Prius for Example) then Emissions are NOT tested !!
 
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RGH0

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Whats the accuracy of their test system and how do they calibrate it. I doubt if its an old school 4 gas analyser it accurate to 0.01 Lamda even with top class calibration equipment
 
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Larhal

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I did a long run today, 35 miles highway speeds. Retested and here are the results:

Code:
Sunday,12,January,2025,13:22:36:49418
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 24.7.1.0 (x64)  HEX-V2 CB: 0.4658.4
Data version: 20240919 DS356.3
www.Ross-Tech.com

Dealer/Shop Name: LarHal



Readiness Status: 0000 0000
Exhaust Gas Recirculation: Passed
Oxygen Sensor Heating: Passed
Oxygen Sensor(s): Passed
Air Conditioning: Passed
Secondary Air Injection: Passed
Evaporative Emissions: Passed
Catalyst Heating: Passed
Catalytic Converter(s): Passed


Sunday,12,January,2025,13:23:40:49418
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 24.7.1.0 (x64)  HEX-V2 CB: 0.4658.4
Data version: 20240919 DS356.3
www.Ross-Tech.com

Dealer/Shop Name: LarHal



                Address 01: Engine  (8E0 909 518 M)

13:23:39 Group 002: General
  760 /min  Engine Speed (G28)
  16.5 %  Engine Load
  2.04 ms  Injection Timing
  2.31 g/s  Mass Air Flow Sensor (G70)

13:23:39 Group 031: Lambda Control (Lambda Sensor Voltages)
  1.000  Lambda Control Bank 1 (actual)
  1.000  Lambda Control Bank 1 (specified)
      
      

13:23:39 Group 032: Lambda Control (Mixture Adaptation)
  1.9 %  Adaptation (Idle) Bank 1 Sensor 1
  0.8 %  Adaptation (Partial) Bank 1 Sensor 1

All Looks good to me. Probably the probe wasent up far enough or there was a draft that went up one side of the exhust.
 
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Dr Sheldon

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Whats the accuracy of their test system and how do they calibrate it. I doubt if its an old school 4 gas analyser it accurate to 0.01 Lamda even with top class calibration equipment
HaHA

They must be calibrated ONCE a year and then get abused for the other 364 days.

I doubt if its an old school 4 gas analyser it accurate to 0.01 Lamda even with top class calibration equipment

It sure is an old school thing. Once bought it can be used for testing for 15 + years.

It only needs to be accurate for CO, CO2, O2 & HC. Lambda is not a measurement, rather a calculation !

You can easily poke it into a good car on site and get a bad one to pass. Yes we are behind in some aspects.

Oh

A TPMS light is a failure but a Bulb Failure Light is not !!
 
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Uwe

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You can easily poke it into a good car on site and get a bad one to pass.
Yep. Makes it easier for the inspection station to cheat, but more difficult for the car owner (via, for example, a tune/re-map that that ignores certain faults and reports all is well via OBD).

-Uwe-
 
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EuroX

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more difficult for the car owner (via, for example, a tune/re-map that that ignores certain faults and reports all is well via OBD).

-Uwe-
Yes and no, depends on knowledge. Yes most owners will no go down the rabbit hole to such lengths. However manipulating what result in a given map equal a pass result is not hard if you know where to look. Many tuners did this and probably still do this. Certain states are more strict than others.
 
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Larhal

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Well it failed again. same issue Lambda inballance. Indicates it is running lean.

Options I have to resolving this?
Have looked for air leaks.

Any suggesstions,

Stii no MIL light on and no codes.

Have passed emissions for the last 10 years here.
 
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Dr Sheldon

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Engine Warm - Fan kicked in and out - MVB for Upstream o2 voltage at Idle and 2000rpm.

Graph those and post here please.
 
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