Check engine light turned on today

[laser21]

Hey guys,

My CEL turned on today, I did a scan

VIN: WVWZZZ3DZ78001026 Mileage: 31960km/19859miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 07C-906-018-BAP1.lbl
Part No SW: 07C 906 018 EC HW: 07C 906 018 EC
Component: D1-6.0L-AG-EU4 A ª9323
Revision: --H01--- Serial number: VWZ3Z0F3502244
Coding: 0000173
Shop #: WSC 49077 136 85090
VCID: 6ADFC69B3CEF

3 Faults Found:
000369 - Fuel Trim; Bank 1: System Too Lean
P0171 - 004 - No Signal/Communication - MIL ON
Freeze Frame:
Fault Status: 11100100
Fault Priority: 0
Fault Frequency: 1
Mileage: 31704 km
Time Indication: 0

Freeze Frame:
RPM: 512 /min
Load: 17.2 %
Speed: 0.0 km/h
Temperature: 84.0°C
Temperature: 33.0°C
Absolute Pres.: 990.0 mbar
Voltage: 13.843 V

000372 - Fuel Trim; Bank 2: System Too Lean
P0174 - 004 - No Signal/Communication - MIL ON
Freeze Frame:
Fault Status: 11100100
Fault Priority: 0
Fault Frequency: 1
Mileage: 31701 km
Time Indication: 0

Freeze Frame:
RPM: 532 /min
Load: 16.1 %
Speed: 0.0 km/h
Temperature: 93.0°C
Temperature: 32.0°C
Absolute Pres.: 990.0 mbar
Voltage: 13.716 V

006435 - Please Check DTC Memory of ECU Number 2
P1923 - 008 - Implausible Signal
Freeze Frame:
Fault Status: 01101000
Fault Priority: 0
Fault Frequency: 1
Mileage: 31963 km
Time Indication: 0

Freeze Frame:
RPM: 0 /min
Load: 0.0 %
Speed: 0.0 km/h
Temperature: 77.0°C
Temperature: 73.0°C
Absolute Pres.: 990.0 mbar
Voltage: 11.938 V

Readiness: 0000 1001

those are the fault codes Im getting.

I have read through a few threads,
http://forums.vwvortex.com/showthrea...n#post74535509
http://forums.vwvortex.com/showthrea...n#post69107195
http://forums.vwvortex.com/showthrea...n#post65905041

and I see a lot of uncertainty.
May it be the air pump?
I have been to the 30000km service last week, they changed the transmission fluid and did all the necessary tasks. They changed the spark plugs as well.
The car drives great, I dont feel any difference, except the CEL light coming on...
Any ideas on this?

Thanks!
Lukas

[Paximus]

Well, the MIL is set by the statutory emissions routines, not the car itself complaining.

So the scan said this:


31701 km - Engine warm, car stopped, idle - ECU#1 did not receive confirmation that the fuel trim on Bank#1 was OK or not too rich

31704 km - Engine warm, car stopped, idle - ECU#1 did not receive confirmation that the fuel trim on Bank#2 was OK or not too rich

31963 km - Engine not cold, stopped, Power Supply 11.9V - ECU#2 CAN-Bus data not received by ECU#1. MIL off.


Do you have the scan for address 11 for ECU#2?

If it was the secondary air system not running at idle, wouldn't that flag a rich mixture rather than lean? Or would the high lambda reading cause the ECU to set the trim too lean to compensate?

Both DTCs are at idle. One of the lambda trim adaptations is done at idle. But the two bank ECUs use separate lambda sensors, so there's no common mode failure to affect both banks there.

The fuel vapour purge cycle also has separate solenoids, no common mode.

The only common item in the mixture set is the engine block exit temperature sensor, but that's monitored by a look-up table so is unlikely not to be flagged.

Other than that the common item are the CAN-Bus comms (ECU) and the fuel. You didn't have a duff tank of fuel with some diesel in it?!

Chris

[laser21]

Thanks Chris for your answer, I had it in the Service when it was around 37000km, so the 2 events probably happened while it was at the dealer.
The last one
006435 - Please Check DTC Memory of ECU Number 2
P1923 - 008 - Implausible Signal

is interesting, because it says
RPM: 0 /min
Load: 0.0 %
Speed: 0.0 km/h

I cleared the errors, will drive around a few km, and see what happens.

I will report back!!!

edit: no diesel

[laser21]

so they left one airhose disconnectec during the 30000km service. VW authorized. ...

at least they fixed it in one afternoon

[Paximus]

Good news (kind of...!) Well, you guessed right about the air flow. I hope they adjusted the bill!

Chris

[VloJoh]

Earlier I had a CEL warning saying my Bank2 catalyst was working sub-standard. Ater resetting this disappeared, the VW dealership wanted to change the exhaust en precatalysts (around 3000USD...)
I thought I was "out of the woods" but now this happened:


Wednesday,03,October,2012,21:39:08:51737
VCDS Version: Release 11.11.4
Data version: 20120807



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


Address 01: Engine Labels: 07C-906-018-BAP1.lbl
Control Module Part Number: 07C 906 018 EF HW: 07C 906 018 EF
Component and/or Version: D1-6.0l-AG5-EU4 A ª1526
Software Coding: 0000173
Work Shop Code: WSC 01065 000 00000
VCID: 6DDBFA1D775BE770FA3
1 Fault Found:

001072 - Catalyst System; Bank 2
P0430 - 002 - Efficiency Below Threshold - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100010
Fault Priority: 0
Fault Frequency: 1
Mileage: 102853 km
Time Indication: 0
Date: 2012.09.30
Time: 18:11:36

Freeze Frame:
RPM: 1926 /min
Load: 29.4 %
Speed: 104.0 km/h
Temperature: 87.0°C
Temperature: 24.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 14.224 V


Readiness: 0000 0000


Readiness Status: 0110 1001
Exhaust Gas Recirculation: Passed
Oxygen Sensor Heating: Failed or Incomplete
Oxygen Sensor(s): Failed or Incomplete
Air Conditioning: Passed
Seconday Air Injection: Failed or Incomplete
Evaporative Emissions: Passed
Catalyst Heating: Passed
Catalytic Converter(s): Failed or Incomplete


Should I have the repairs done as proposed by VW??? MotoTalk also mentions replacing the "flexrohre" in the exhaust system (wire-mesh fleible couplings) which (when leaking) could cause fresh air to mix with the primary exhaust gasses. Anyone have any experience with this?

Advice would be much appreciated

John