Reducer flow not detected (Solution)

Hello everyone, I'm having a problem with a VW T6 2.0 TDI.
Despite the AdBlue tank being full, the warning message indicates that there is enough AdBlue for another 1500 km. The fault code P218F is stored in the fault memory. See the error log and SCR measurement values below.

The basic settings, specifically 'SCR System Check' and 'SCR Dosage Check', could not be completed. The message "Aborted (for safety reasons)" appeared. Routine ended: Routine not in order.
What I've noticed is the fill level, which is supposed to be 0 mm (IDE10249 Reducing agent fill level sensor: Actual value 0 mm).
Does anyone have any idea what that could be?
Thank you very much for your help!
Best regards, Patrick.

Start Error Log:
Thursday, August 28, 2025, 18:16:55:14924
VCDS -- A VAG/VAS emulator based on Windows, running on Windows 10 x64 (VMware).
VCDS Version RKS 25.3.1.1 HEX-V2 CB: 0.4671.4
Data as of: 20250429 DS365.0



Mileage: 96,331 km


Address 01: Engine Control Module
Label file: DRV\04L-907-309-V2.CLB
Control unit part number: 04L 906 056 KM. Hardware: 04L 907 445.
Part and/or version: R4 2.0l TDI, H02 6186.
Encoding: 0019401C435401090000
Operating number: WSC 02737 790 50316
ASAM Dataset: EV_ECM20TDI03004L906056KM 004013 (VN75)
ROD: EV_ECM20TDI03004L906056JT.rod
VCID: 025C7F67D48CB5DA99E-8057
Sure, here is the translation of the text from German to English:

"1 error found:"

31149 - Reducing agent flow.
P218F 00 [11101100] - not recognized.
Warning light ON - Intermittent - Confirmed - Checked since last reset.
Environmental conditions:
Error priority: 2
Error frequency: 1
Mileage: 96,331 km
Date: 2092.01.03
Time: 15:35:34

Motor speed: 828.75 rpm.
Normalized load value: 43.9%
Vehicle speed: 0 km/h
Coolant temperature: 51 °C
Intake air temperature: 41 °C
Ambient air pressure: 950 mbar.
Voltage at terminal 30: 14.421 V.
Lost count after OBD: 40
Outdoor Temperature Sensor 1, Bank 1: Raw Value: 24.0 °C
Reduction agent dosing module, relative pressure: calculated: 0 mbar.
Reducing agent level sensor: Current value: 0 mm.
Supplier for tank temperature reduction agent: Temperature: 23.7 °C.
Reduction agent system, pressure buildup, release conditions - Engine running: Condition not met.
Reduction agent system, pressure build-up, release conditions - pressure release: condition not met.
Reduction agent system, pressure build-up, release conditions, heating strategy. Releases: Condition not met.
Reduction agent system: Pressure buildup. Release conditions - pressureless, minimum time exceeded: Condition not met.
Reduction agent system, pressure buildup, release conditions - Category, temperature reached: Condition not met.
Reduction agent system, pressure buildup, release conditions - release due to a stuck valve needle: Condition not met.
Reduction agent system, pressure buildup, release conditions - flushing function ended: condition not met.
Reduction agent system: Pressure buildup. Release conditions - initial filling performed: Condition not met.
Reduction agent system, pressure build-up, release conditions - release via inducement: condition not met.
Reducing agent system, pressure build-up, release conditions: 127.


Readiness: Not Available.
End of Error Log:

Start measurements:
IDE03133 Heating circuit 1 for reducing agent dosing system: Actual current 0.000 A.
IDE03134 Heating circuit 2 for reducing agent dosing system: Actual current 0.327 A.
IDE03135 Tank temperature sensor: Temperature 25.2 °C.
IDE03139 Injector valve for reducing agent: Resistance 12.908 Ohms.
IDE03142 Remaining distance until reaching the point where the reduction agent will be depleted: 1955.680 km.
IDE03190-IDE04099: Number of requested start operations (statistic) - Reduction agent dosage: 5.
IDE03242 Injector valve for reducing agent: Current during holding phase 0.358 A.
IDE03243 Injector valve for reducing agent: Current, saturation phase, 1.024 A.
IDE03387: Duration of overtemperature at the reducing agent injection valve: 651 seconds.
IDE04099 Reducing agent dosage ReAg Rate/Demand: 0.0/0.10 L/h / Reag Tank Level: 31.0 %
IDE05626 Temperature at the reducing agent injection valve: calculated 37.0 °C.
IDE10032: Sensor for reducing agent quality: Urea concentration 273.92 %.
IDE10039: Sensor for reducing agent quality: Validity - valid.
IDE10241 Reducing agent pump module, relative pressure: calculated as 0 mbar.
IDE10247 Reducing agent tank volume: Actual value calculated, 5.322 l.
IDE10248 Reduction agent feed pump: Offset factor calculated as 0.979.
IDE10249 Reducing agent level sensor: Current value 0 mm.
IDE10250 Reduction agent return pump: adapted displacement volume 0.038 ml.
IDE10251 Reducing agent feed pump: measured resistance 4.482 Ohms.
IDE10252: Operating hour counter for the reducing agent system, no errors, 255 counts.
IDE10565 Reducing agent: Dosage verification - Release criteria 64.
IDE10579-MAS01493 Reduction system - Pressure buildup - Release conditions - Engine running - Condition met.
IDE10579-MAS10830 Reduction agent system. Pressure buildup. Release conditions - pressure release. Condition met.
IDE10579-MAS10831 Reduction system, pressure build-up, release conditions, heating strategy, releases, condition met.
IDE10579-MAS10832: Reducing agent system. Pressure buildup. Release conditions. Pressureless. Minimum time exceeded. Condition met.
IDE10579-MAS10833 Reduction agent system. Pressure buildup. Release conditions: Category-Temperature reached. Condition fulfilled.
IDE10579-MAS10834 Reduction system, pressure buildup. Release conditions - Release due to stuck valve needle. Condition met.
IDE10579-MAS10835: Reducing agent system. Pressure buildup. Release conditions. Flushing function completed. Condition met.
IDE10579-MAS10836 Reduction agent system. Pressure buildup. Release conditions - initial filling completed. Condition not met.
IDE10579-MAS13646 Reduction agent system. Pressure buildup. Release conditions - release via inducement. Condition not met.
IDE10579 Reducing agent system, pressure build-up, release conditions, 127.
IDE10916 Reduction agent system, bounce distance 0 km.
IDE10917 Reducing agent feed pump: Coil temperature 301.7 °C.
IDE10918 Reducing agent: Dosage amount test, calculated actual amount: 655.35 g.
IDE10919 Reducing agent: Dosage amount test - calculated target amount: 0.00 g.
IDE10920 Temperature before reducing agent catalyst: calculated 173.2 °C.
IDE10921 Reducing agent dosing pump: Number of strokes 0.
IDE11219 Reducing agent injection rate: Target value 0 mg/s.
IDE11220 Reduction agent system: current status 2.
IDE11220 Reduction system: current status COSCR_no pressure control.
IDE11221 Reduction agent system: last status 1.
IDE11221 Reduction agent system: current status COSCR_Ready.
IDE11222: Reducing agent system: current substatus 255.
IDE11222 Reduction agent system: current substatus COSCR_invalid.
IDE11223 Reduction agent system: last substatus 0.
IDE11223 Reduction agent system: last substatus Unknown (0)
IDE11250 Reducing agent quality sensor: Temperature raw value 0.0 °C.

End of measurement values:http://shop.dieselschrauber.org/en

Hi,

Bitte gib mir den Text, den du übersetzt haben möchtest.
Is the AdBlue tank completely full?

You can find the injector valve for the reducing agent on the exhaust pipe at the end of the drive shaft, easily accessible from below. Possibly... Flush the valve!

Best regards, Rainer.

Hello Rainer,
Thank you for your reply. The AutoLog is attached below. I removed the SCR valve and tested it using the dosing test. There was no leakage from the AdBlue hose connected to the valve either. The attached photo shows some of the measured values. How can I verify the correctness of the release condition (specified as 64)?
Best regards, Patrick.

Start Log:
Monday, September 1, 2025, 10:16:09:14924
VCDS -- A VAG/VAS emulator based on Windows, running on Windows 10 x64 (VMware).
VCDS Version RKS 25.3.1.1 HEX-V2 CB: 0.4671.4
Data as of: 20250429 DS365.0



Vehicle Identification Number: WV2ZZZ7HZJH028371 License plate:
Mileage: 96668. Repair order:



"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein wunderschöner Tag, um spazieren zu gehen oder ein Picknick im Park zu machen. Viele Menschen genießen das gute Wetter und verbringen Zeit im Freien."
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein wunderschöner Tag, um spazieren zu gehen oder ein Picknick im Park zu machen. Viele Menschen genießen das gute Wetter und verbringen Zeit im Freien."


Vehicle type: 7H-VN75 (7E0)
Scan: 01 03 04 08 09 10 13 15 17 18 19 25 3C 5F 61 69 6E

Vehicle Identification Number: WV2ZZZ7HZJH028371

01-Motor electronics -- Status: Error 0010.
03-Brake electronics -- Status: OK 0000
04-Steering angle sensor -- Status: OK 0000
08-Climate/Heating Unit -- Status: OK 0000
09-Central Electrical System -- Status: OK 0000
10-Parking Assist 2 -- Status: OK 0000
13-meter distance rule -- Status: OK 0000
15-Airbag -- Status: OK 0000
17-Terminal block insert -- Status: OK 0000
18-Heater -- Status: OK 0000
19-Diagnosis interface -- Status: OK 0000.
Immobilizer -- Status: OK 0000
3C track switch -- Status: OK 0000.
5F-Information Selection. I -- Status: OK 0000
61-Battery regulation -- Status: OK 0000
69 followers -- Status: OK 0000
6E-Qty./Order. Roof -- Status: OK 0000
"Der schnelle braune Fuchs springt über den faulen Hund."
Address 01: Engine Control Module (2D2D2-CXHA)
Label file: . DRV\04L-907-309-V2.clb
Part number SW: 04L 906 056 KM, Part number HW: 04L 907 445.
Part: R4 2.0l TDI H02 6186
Revision: 23002001
Encoding: 0019401C435401090000
Operating number: WSC 02737 790 50316
ASAM Dataset: EV_ECM20TDI03004L906056KM 004013
ROD: EV_ECM20TDI03004L906056JT.rod
VCID: 025C7F67D48CB5DA99E-8057
VINID: 9E60AAAAA1D8A9A6000880C704085F93DD

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

"1 error found:"
31149 - Reducing agent flow.
P218F 00 [11101100] - not recognized.
Warning light ON - Intermittent - Confirmed - Checked since last reset.
Environmental conditions:
Error priority: 2
Error frequency: 1
Mileage: 96,331 km
Date: 2092.01.03
Time: 15:35:34

Motor speed: 828.75 rpm.
Normalized load value: 43.9%
Vehicle speed: 0 km/h
Coolant temperature: 51 °C
Intake air temperature: 41 °C
Ambient air pressure: 950 mbar.
Voltage at terminal 30: 14.421 V.
Lost count after OBD: 40
Outdoor Temperature Sensor 1, Bank 1: Raw Value: 24.0 °C
Reduction agent dosing module, relative pressure: calculated: 0 mbar.
Reducing agent level sensor: Current value: 0 mm.
Supplier for tank temperature reduction agent: Temperature: 23.7 °C.
Reduction agent system, pressure buildup, release conditions - Engine running: Condition not met.
Reduction agent system, pressure build-up, release conditions - pressure release: condition not met.
Reduction agent system, pressure build-up, release conditions, heating strategy. Releases: Condition not met.
Reduction agent system: Pressure buildup. Release conditions - pressureless, minimum time exceeded: Condition not met.
Reduction agent system, pressure buildup, release conditions - Category, temperature reached: Condition not met.
Reduction agent system, pressure buildup, release conditions - release due to a stuck valve needle: Condition not met.
Reduction agent system, pressure buildup, release conditions - flushing function ended: condition not met.
Reduction agent system: Pressure buildup. Release conditions - initial filling performed: Condition not met.
Reduction agent system, pressure build-up, release conditions - release via inducement: condition not met.
Reducing agent system, pressure build-up, release conditions: 127.

Readiness: Not Available.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 03: Brake Electronics (J104)
Label file: DRV\7E0-907-37x-MK100ESC.clb
Part number SW: 7E0 907 379 P, HW: 7E0 907 379 M.
Component: ESC H06 0133
Revision: 00000000 Serial Number: 61897000001240
Encoding: 617E4098256484868678027DA48321D278F500
Operating number: WSC 02739 790 50316
ASAM Dataset: EV_Brake1ESCCONTIVN75XGP2 011001
ROD: EV_Brake1ESCCONTIVN75XGP2_011.rod
VCID: 3FDAB693E7FE1832B60-806B

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address: Steering angle sensor (G085)
Label file: * DRV\6R0-959-654.clb
Part number SW: 6R0 959 654 Part number HW: 6R0 959 654
Part: STEERING SENSOR H07 0070
Serial number: 24061713470481.
Encoding: 01
Operating Number: WSC 00000 000 00000
ASAM Dataset: EV_LWSKLOVW25X 005001
FILE: EV_LWSKLOVW25X.rod
VCID: 7EA40B97A074D13AFD6-802B

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 08: Climate Control/Heating Module (J255) Label file:| DRV\7E5-907-040.clb
Part number SW: 7E0 907 040 AA, HW: 7E0 907 040 AA.
Part: Climatronic T5 H04 0613
Revision: 00001K04
Encoding: 0000000103
Operating number: WSC 02737 790 50316
ASAM Dataset: EV_ClimatronicT5 A01003
ROD: EV_ClimaAutoT5Basis_VN75.rod
VCID: 629C5FE734CC15DAF9E-8037

Slave 1:
Subsystem 1 - Part number SW: 7E7 907 049 C, HW: 7E7 907 049 C.
Part: Rear control unit H11 0303.
Serial number: BHB-0011407170015047

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 09: Central Electronics (J519)
Label file: . DRV\7E0-937-BCM-V1.clb
Part number SW: 7E0 937 090 C, HW: 7E0 937 090 C.
Part number: BCM PQ25 Max4 H82 0752.
Revision: B9082001 Serial Number: 4000 188171698
Encoding: 62A8393A0A21201201284F746CEB8ED40F94710F60CC6D60330400230840
Operating number: WSC 02739 022 266146
VCID: 2B02F2C3030694920A8-807F

Subsystem 1 - Part number: 5K7 955 559 C. Label file: DRV\5K7-955-559.CLB.
Part number: RLS 060717 04 42 0106.
Encoding: 0228EE

Subsystem 2 - Part number SW: 7E0 959 801 N HW: 7E0 959 801 N Label file: DRV\7E0-959-80X-V2.CLB
Part: J386__TSG_FT 003 0654
Serial number: KU0KU006071771871953
Encoding: 0400A1

Subsystem 3 - Part number SW: 7E0 959 802 R HW: 7E0 959 802 R Label file: DRV\7E0-959-80X-V2.CLB
Part: J387__TSG_BT 004 0654
Serial number: KU0KU018071771990654
Encoding: 1400A1

Subsystem 4 - Part number SW: 7E0 959 442 A, HW: 7E0 959 442 A, Label file: DRV\3C8-959-537.CLB.
Component: E221__MFL-DC1 H02 0103
Serial number: 46170001388270067213
Encoding: B4FFFF

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 10: Parking Assist 2 (J446) Label file8) DRV\7E0-919-475.clb
Part number SW: 7E0 919 475 AA, HW: 7N0 919 475.
Part: PARKING ASSIST 8K H06 0212
Revision: -------- Serial Number: 28231715600224
Encoding: 31800C
Operating number: WSC 02739 790 50316
ASAM Dataset: EV_VW75XParkAssis8K 001012
ROD: EV_VW75XParkAssis8K_001_VN75.rod
VCID: 71BE20ABE12ABE42704-8025

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 13: Distance Control (J42:| Label file:| DRV\7N0-907-572.clb
Part number SW: 7N0 907 572 C, HW: 7E0 907 572.
Component: ACC Bosch PQx H03 0211
Serial number: 0307170438A3E2. Data version number: 7E0114v____ 0009.
Encoding: 00004800FE0779
Operating number: WSC 01383 790 50316
ASAM Dataset: EV_ACCBEGVW361 001006
ROD: EV_ACCBEGVW361.rod
VCID: 3634D3B7C8C4D97A656-8063

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 15: Airbag (J234) Label file:| DRV\5K0-959-655.clb
Part number SW: 7E0 959 655 H, HW: 7E0 959 655 H.
Part number: VW10Airbag01R H08 0018
Revision: --------
Serial number: 003V4003788L
Data version number: 7E0003V____ 0908
Encoding: 0000000000000000000000000000000
Operating number: WSC 02734 790 50316
ASAM Dataset: EV_AirbaVW10BPAVW12X 001028
ROD: EV_AirbaVW10BPAVN750.rod
VCID: 3B22C283F3E604129A8-806F

Crash sensor for driver-side side airbag:
Serial number: 3495ZRB401E59OGC5P5%

Crash sensor for side airbag, passenger side:
Serial number: 3505ZRB401059OGCH0MO

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 17: Terminal block module.
unavailable

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 18: Auxiliary Heater (J364) Label file:| DRV\7E0-963-27X-18.clb
Part number SW: 7E0 963 273 A, HW: 7E0 963 273 A.
Component: STH-T5GP2 003 0009
Encoding: 4101
Operating number: WSC 02739 790 50316
ASAM Dataset: EV_AuxilParkiHeateWOST5G2 001013
ROD: EV_AuxilParkiHeateWOST5G2.rod
VCID: 2B02F2C3038694920A8-807F

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 19: Diagnostic interface (J533)
Label file: . DRV\7E0-909-901.clb
Part number SW: 7E0 909 901, HW: 7E0 937 090 C.
Component: GW-K-CAN TP20 H82 0752
Revision: B9082001
Encoding: 042207
Operating number: WSC 02739 022 266146
VCID: 68884DCFD2707F8A27A-803D

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 25: Immobilizer (J334) Label file:| DRV\5K0-920-xxx-25.clb
Part number SW: 5K0 953 234 HW: 5K0 953 234
Component: IMMO H03 1107
Serial number:
Encoding: 000000
Operating Number: WSC 00000 000 00000
ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03710
ROD: EV_Immo_UDS_VDD_RM09_VW32.rod
VCID: 6A8C37C7CCFC4D9A31E-803F

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 3C: Lane Change (J769) Label file:| DRV\5Q0-907-566.clb
Part number SW: 7E0 907 566 C, HW: 4H0 907 566 F.
Component: SWA Master H08 0030
Serial number: 0446518073.
Encoding: 030321
Operating number: WSC 02739 790 50316
ASAM Dataset: EV_LaneChangeAssist 001028
ROD: EV_LaneChangAssis_VN75.rod
VCID: 3038E5AF2AA0F74A3FA-8065

Control unit 2 for lane change assist:
Subsystem 1 - Part number SW: 7E0 907 568 C, HW: 4H0 907 568 F.
Component: SWA Slave H08 0030.
Serial number: 0447513586
Encoding: 030321

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 5F: Information selection. I (J794) Label file[/b] 5G0-035-MIB-STD2.clb
Part number SW: 5C0 035 680 G, HW: 5C0 035 680 G.
Part: MU-S-ND-ER H41 0449
Serial number: VWZAZ2T5302789
Data version number: V03935266VJ 0001
Encoding: 06570001BE00000011111101008808031F0100D4002001004F
Operating number: WSC 02739 790 50316
ASAM Dataset: EV_MUStd4CTSAT 001022
ROD: EV_MUStd4CTSAT_VW32.rod
VCID: 251604FB6562A2E2DCC-8071

Data storage devices:
Subsystem 1 - Part number SW: V03 959 821 FN HW: -----------
Part: ECE DL2 24/25 --- 2210
Serial number: --------------------

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 61: Battery Management (J840) Label file: . DRV\1K0-907-534.clb
Part number SW: 7E0 907 534, HW: 7E0 937 090 C.
Component: Battery management system H82 0752.
Serial number: 4000 188171698
Encoding: 330B1A73
Operating Number: WSC 02739 790 00000
VCID: 68884DCFD2707F8A27A-803D

Subsystem 1 - Part number SW: 7E0 915 181 K, HW: 7E0 915 181 K.
Part: J367-BDMConti H03 1050
Serial number: 75885700001707100760

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 69: Trailer (J345) Label file: . DRV\1K0-907-383-V2.clb
Part number SW: 1K0 907 383 H, HW: 1K0 907 383 G.
Part: Trailer H12 0130
Revision: 3B001001 Serial number: 00000448080350
Encoding: 410D000103000000
Operating Number: WSC 02739 790 00000
VCID: 323CEFA7242CC55A49E-8067

No error codes found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 6E: Quantity/Connection for Roof (J702) Label file: . DRV\7E5-919-037-L2.clb
Part number SW: 7E5 919 037 H HW: 7E5 919 037 H
Component: Roof display H18 0200.
Revision: 11100013 Serial number: 495667
Encoding: 000106
Operating number: WSC 02759 790 00000
VCID: 3634D3B7C844D97A656-8063

No error codes found.

End --------(Duration: 01:40, Battery voltage start/end: 12.8V/13.5V)--------
-----------------------------1 error found-----------------------------http://shop.dieselschrauber.org/en

Thanks, no idea.

Quote:

Reducing agent, level sensor: Current value: 0 mm. Suppliers of tank temperature reduction agents:

It's possible that something is blocked, and the engine control unit (ECU) is interpreting that the AdBlue tank is empty?
I can check if the 0mm value is completely full or completely empty.

-> Check the level sensor.

Best regards, Rainer.

Unfortunately, I didn't have a Windows-based VCDS with me, and I missed the update... I'm seeing "17" as the value from the AdBlue level sensor, but unfortunately, it's displayed without a unit. Since my tank is quite full, 0mm might actually mean "completely full."

Best regards, Rainer.

Here's the solution to the problem. The AdBlue tank was replaced, and immediately afterward, the fill level could be read using VCDS. The subsequent test drive only corrected the range displayed on the instrument cluster.
Why VCDS did not perform the test for fuel quantity (see the post above) without displaying an error message is unclear to me.
I hope these insights can be helpful to someone.
Best regards, Patrick.

Thank you for your feedback!