Hi all, I'm seeking your wisdom on an issue I've been having. Apologies if this should be in the VCDS forum instead - I wasn't sure. 

While driving on the M25 my car went into what I suspect is limp mode but I'm not sure. A scan (on a basic hand-held device) revealed the following two codes:

 

P0087 - Fuel Rail/System Pressure Too Low
P229A - Fuel Pressure Regulator 2 Exceeded Control Limits - Pressure Too Low

 

I get the flashing glow plug light, but the issue feels more like a loss in power rather than the engine manually restricting itself. I can get up to 70 (eventually) on flat ground. Introduce an upwards incline to the mix though and I'm lucky to maintain 50. Initially this fault would clear whenever I reset the ignition switch and then reintroduce itself when the engine went under heavy load or I revved too high. Previous searching has led me to believe this could be the turbo vanes, so before trying to get into the hot side of the turbo I tried some cleaner spray that goes into the intake (which I appreciate can't be doing much from the cold side of the turbo). 

After doing this and driving the car, the faults changed. Resetting the ignition no longer stops the coil light from flashing, the DPF light is now illuminated (though I suspect this is more to do with me not being able to rev the nuts off of it and clear it out) and I have the yellow check engine light displayed. 

I changed the fuel filter today and found a *lot* of sediment in housing. I do wonder if these could me metal filings from the high pressure fuel pump but I'm not sure at this point. At any rate, I cleaned it all out, primed the filter with VCDS, cleared all codes (lights immediately return upon clearing) and took it for another drive. When I got back I carried out a VCDS scan and got the following:

 

Wednesday,18,May,2022,16:17:24:39914
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.3.1.4 (x64)  HEX-V2 CB: 0.4615.4
Data version: 20220407 DS337.0
www.Ross-Tech.com


VIN: [hidden]   License Plate: 
Mileage: 185560km-115301mi   Repair Order: 


Chassis Type: 1Z-SK35 (7N0)
Scan: 01 03 08 09 10 15 16 17 19 25 2E 37 42 44 46 52 56 62 72

VIN: TMBCT21Z8C2065314   Mileage: 185560km-115301miles

01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
10-Park/Steer Assist -- 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
2E-Media Player 3 -- Status: OK 0000
37-Navigation -- Status: Malfunction 0010
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
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CAYC)       Labels:. 03L-906-023-CAY.clb
   Part No SW: 03L 906 023 LP    HW: 03L 906 023 JH
   Component: R4 1.6l TDI   H43 9978  
   Revision: --H43---    Serial number:                CVN: DDE5EFC5
   Coding: 00114014030500080000
   Shop #: WSC 44144 002 1048576
   ASAM Dataset: EV_ECM16TDI02103L906023LP 003012
   ROD: EV_ECM16TDI02103L906023LP_003.rod
   VCID: 7F5B0D83C774C253B65-802A
   VINID: 91D49390206A2130801850C110625B6F89

2 Faults Found:
16856 - Particle Filter 
          P2463 00 [173] - Excessive Soot Accumulation
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 185554 km
                    Date: 2022.05.18
                    Time: 15:48:59

                    Engine RPM: 0.00 /min
                    Normed load value: 0.0 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 59 °C
                    Intake air temperature: 38 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 12.198 V
                    Unlearning counter according OBD: 40
                    Particle filter: soot mass measured-MASS_SOOT_PHY_PF: 40.01 g
                    Particle filter: soot mass calculated-MASS_SOOT_SIM_PF: 23.54 g
                    Particle filter kilometers since last regeneration_1-DIST_RGN_ENVD_H: 770 km
                    Counter for regeneration time of particulate filter-T_INT_RGN_ACT_INI_PF_ENVD_H: 4626.8415 s
                    Particle filter: difference pressure-DIP_PF: 3.90 hPa
                    DPF: offset for differential pressure-DIP_PF_AD[0]: -13.27 hPa
                    Service regeneration: Release conditions 3-FRF_STATE_RGN: 9

10116 - Fuel Rail/System Pressure 
          P0087 00 [101] - Too Low
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 185554 km
                    Date: 2022.05.18
                    Time: 15:58:27

                    Engine RPM: 2260.25 /min
                    Normed load value: 38.8 %
                    Vehicle speed: 37 km/h
                    Coolant temperature: 61 °C
                    Intake air temperature: 37 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 14.118 V
                    Unlearning counter according OBD: 40
                    Fuel high-pressure: actual value-FUP_FIL: 96.301 MPa
                    Fuel pressure regulator valve: specified value rail pressure-LV_PCV_CTL: 00000000 
                    Fuel level-FTL_CAN: 28 l
                    Fuel temperature-TFU: 39 °C
                    Fuel Metering Valve-VCV: 29.204 %
                    Fuel Pressure Regulator Valve-PCV: 34.242 %
                    Fuel high pressure commanded value_1-FUP_SP_KPA_ENVD: 111505.127 kPa

Readiness: 1 1 0 0 1 

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels:. 1K0-907-379-MK70M.clb
   Part No SW: 1K0 907 379 AK    HW: 1K0 907 379 AK
   Component: MK70 M MASR         0106  
   Revision: 00H35001    
   Coding: 0017665
   Shop #: WSC 73430 790 00064
   VCID: 7BA3F993DFECDE739AD-802E

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J301)       Labels:| 3C8-907-336.clb
   Part No SW: 3T0 820 047 AB    HW: 3T0 820 047 AB
   Component: AC Manuell    H19 0502  
   Revision: 00001010    
   Coding: 0000000002
   Shop #: WSC 73430 790 00064
   ASAM Dataset: EV_ACManueBHBVW36X A01010
   ROD: EV_ACManueBHBVW36X_VW46.rod
   VCID: 6FBBDDC39714B2D3265-803A

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 1K0-937-08x-09.clb
   Part No SW: 1K0 937 084 F    HW: 1K0 937 084 F
   Component: BCM PQ35  B   110 0651  
   Revision: 00110 AC    
   Coding: 48000AB8A05BB1C04008008011000024430000AE524D81605CC440000040
   Shop #: WSC 73430 790 00064
   VCID: 313F1BBB4120E423701-8064

   Subsystem 1 - Part No: 1Z2 955 119 D  Labels: 1KX-955-119.CLB
   Component: Wischer 09091  26  0601 
   Coding: 00D7B7

   Subsystem 2 - Part No: 1Z0 951 171 
   Component: Innenraumuebe  008 5101 

1 Fault Found:
01134 - Alarm Horn (H12) 
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 70
                    Mileage: 185554 km
                    Time Indication: 0
                    Date: 2016.10.08
                    Time: 15:48:55

             Freeze Frame:
                        Term 15 On
                    Voltage: 12.15 V
                        ON
                        ON
                        Term 50 Off
                        OFF
                        OFF


-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 5J0-919-475.clb
   Part No SW: 5J0 919 475 A    HW: 5J0 919 475 A
   Component: PARKHILFE 4K  H11 0005  
   Revision: --H11---    Serial number: 75461125800542
   Coding: 10800E
   Shop #: WSC 13765 790 00064
   ASAM Dataset: EV_EPHVA14SKxxx0000 001001
   ROD: EV_EPHVA14SKxxx0000_001.rod
   VCID: 333311B3BBBCD63302D-8066

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 1K0-909-605.lbl
   Part No SW: 1K0 909 605 T    HW: 1K0 909 605 T
   Component: Q4 AIRBAG VW8   020 2300  
   Revision: 05020000    Serial number: 0038PD2SZ3L9  
   Coding: 0020788
   Shop #: WSC 73430 790 00064
   VCID: 3D27378B81781043E49-8068

   Subsystem 1 - Serial number: 6332MSME623612753

   Subsystem 2 - Serial number: 6342MSME636604221

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:| 5K0-953-569.clb
   Part No SW: 5K0 953 521 BM    HW: 5K0 953 569 D
   Component: LENKS.MODUL   014 0140  
   Revision: FF010040    Serial number: 20110903301808
   Coding: 108A040000
   Shop #: WSC 73430 790 00064
   ASAM Dataset: EV_SMLSNGVOLWSXS A01004
   ROD: EV_SMLSNGVOLWS.rod
   VCID: 78A9E69FE25AF56BF7F-802C

   Multifunction steering wheel control module: 
   Subsystem 1 - Part No SW: 3T0 959 537     HW: 3T0 959 537   Labels: 3C8-959-537.CLB
   Component: E221__MFL-URO  H07 0012 
   Coding: 820000

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 5K0-920-xxx-17.clb-SRI1
   Part No SW: 1Z0 920 943 S    HW: 1Z0 920 943 S
   Component: KOMBI         H05 0607  
   Serial number: 00000000000000
   Coding: 410A00
   Shop #: WSC 73430 031 00064
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04114
   ROD: EV_Kombi_UDS_VDD_RM09_004_SK35.rod
   VCID: 49CF535BC930BCE3581-801C

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 7N0-907-530-V2.clb
   Part No SW: 7N0 907 530 H    HW: 1K0 907 951 
   Component: J533  Gateway H42 1620  
   Revision:   H42       Serial number: 140911F2001757
   Coding: 351303
   Shop #: WSC 73430 790 00064
   VCID: 35372FABB548C8032C9-8060

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer (J334)       Labels:| 5K0-920-xxx-25.clb
   Part No SW: 5K0 953 234     HW: 5K0 953 234 
   Component: IMMO          H05 0607  
   Serial number: 00000000000000
   Coding: 000000
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03009
   ROD: EV_Immo_UDS_VDD_RM09_VW21.rod
   VCID: 6A8DCCD7ACF657FB71B-803E

No fault code found.

-------------------------------------------------------------------------------
Address 2E: Media Player 3 (J650)       Labels:. 5N0-035-342.lbl
   Part No SW: 5N0 035 342 E    HW: 5N0 035 342 E
   Component: SG EXT.PLAYER H13 0240  
   Revision: A1001003    Serial number: 7660764359    
   Coding: 020000
   Shop #: WSC 73430 790 00064
   VCID: 290FF3DB69F09CE3B81-807C

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation (J794)       Labels:| 1K0-035-27x-37.clb
   Part No SW: 3T0 035 192 C    HW: 3T0 035 192 C
   Component: RNS315-EU   H34 0263  
   Serial number: SKZAZ2L9219125
   Coding: 040004110401000000000002
   Shop #: WSC 73430 031 00064
   ASAM Dataset: EV_RNS315EUV2UDS A01004
   ROD: EV_RNS315EUV2UDS.rod
   VCID: 2E0500C7509EFBDB6D3-807A

   Data carrier: 
   Subsystem 1 - Part No: 3AA 919 866 
   Component: EUR_W_0031  0031 

1 Fault Found:
1048642 - Internal Control Module Memory Check Sum Error 
          B2000 42 [009] - General Memory Failure
          [ECU defect data memory failure]
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 4
                    Fault Frequency: 1
                    Mileage: 160654 km
                    Date: 2020.06.21
                    Time: 14:57:44


-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels:. 1K0-959-701-MIN3.clb
   Part No SW: 1T0 959 701 T    HW: 1T0 959 701 T
   Component: Tuer-SG         009 2120  
   Coding: 0000756
   Shop #: WSC 73430 790 00064
   VCID: 48C9565FDEBA45EB47F-801C

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1K0-909-14x-GEN3.clb
   Part No: 1K0 909 144 M
   Component: EPS_ZFLS Kl. 69     3201  
   Revision: 00H20000    
   Shop #: WSC 73430 790 00064
   VCID: 343112AFB232D10B1B7-8060

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels:. 1K0-959-702-MIN3.clb
   Part No SW: 1T0 959 702 R    HW: 1T0 959 702 R
   Component: Tuer-SG         009 2120  
   Coding: 0000756
   Shop #: WSC 73430 790 00064
   VCID: 47CB5563D3A44A934E5-8012

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels:. 1K0-959-703-GEN3.clb
   Part No SW: 5K0 959 703 A    HW: 5K0 959 703 A
   Component: Tuer-SG         007 2101  
   Coding: 0000144
   Shop #: WSC 73430 790 1012544
   VCID: 323D14B74826DF3B09B-8066

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels:. 1K0-959-704-GEN3.clb
   Part No SW: 5K0 959 704 A    HW: 5K0 959 704 A
   Component: Tuer-SG         007 2101  
   Coding: 0000144
   Shop #: WSC 73430 790 1012544
   VCID: 333311B3B73CD63302D-8066

No fault code found.

End----------(Elapsed Time: 01:09, VBatt start/end: 12.5V/12.5V)-----------

I'm very new to VCDS and trying to understand how to properly decipher the scan reports. I do notice that under "fuel pressure regulator valve", "specified rail value" is reading zero - is that a clue as to the problem? Finally it's worth mentioning I had an injector replaced just around Christmas and have been waiting for another one to go, but I assumed that would throw it's own separate error.

If you've made it through my wall of text, please accept my thanks and I'm grateful for any advice you can offer. Cheers!

- Nathan

Sorry to bump but a new code (P229A) has appeared in addition to the existing ones. Anyone experienced similar?

 

All engine block DTCs: 

Friday,20,May,2022,11:10:25:39914
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.3.1.4 (x64)  HEX-V2 CB: 0.4615.4
Data version: 20220407 DS337.0
www.Ross-Tech.com


VIN:    License Plate: 
Mileage: 185640km-115351mi   Repair Order: 



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


                Address 01: Engine       Labels: 03L-906-023-CAY.clb
Control Module Part Number: 03L 906 023 LP    HW: 03L 906 023 JH
  Component and/or Version: R4 1.6l TDI   H43 9978
           Software Coding: 00114014030500080000
            Work Shop Code: WSC 44144 002 1048576
              ASAM Dataset: EV_ECM16TDI02103L906023LP 003012 (SK35)
                       ROD: EV_ECM16TDI02103L906023LP_003.rod
                      VCID: 7F5B0D83C774C253B65-802A
3 Faults Found:

16856 - Particle Filter 
          P2463 00 [173] - Excessive Soot Accumulation
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 185644 km
                    Date: 2022.05.20
                    Time: 10:44:49

                    Engine RPM: 0.00 /min
                    Normed load value: 0.0 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 89 °C
                    Intake air temperature: 48 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 12.085 V
                    Unlearning counter according OBD: 40
                    Particle filter: soot mass measured-MASS_SOOT_PHY_PF: 40.01 g
                    Particle filter: soot mass calculated-MASS_SOOT_SIM_PF: 23.54 g
                    Particle filter kilometers since last regeneration_1-DIST_RGN_ENVD_H: 770 km
                    Counter for regeneration time of particulate filter-T_INT_RGN_ACT_INI_PF_ENVD_H: 4626.8415 s
                    Particle filter: difference pressure-DIP_PF: 0.00 hPa
                    DPF: offset for differential pressure-DIP_PF_AD[0]: -13.27 hPa
                    Service regeneration: Release conditions 3-FRF_STATE_RGN: 9

10116 - Fuel Rail/System Pressure 
          P0087 00 [101] - Too Low
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 185644 km
                    Date: 2022.05.20
                    Time: 10:53:27

                    Engine RPM: 1732.75 /min
                    Normed load value: 46.3 %
                    Vehicle speed: 28 km/h
                    Coolant temperature: 93 °C
                    Intake air temperature: 40 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 14.005 V
                    Unlearning counter according OBD: 40
                    Fuel high-pressure: actual value-FUP_FIL: 70.068 MPa
                    Fuel pressure regulator valve: specified value rail pressure-LV_PCV_CTL: 00000000 
                    Fuel level-FTL_CAN: 23 l
                    Fuel temperature-TFU: 46 °C
                    Fuel Metering Valve-VCV: 30.754 %
                    Fuel Pressure Regulator Valve-PCV: 35.637 %
                    Fuel high pressure commanded value_1-FUP_SP_KPA_ENVD: 113745.117 kPa

7476 - Fuel Pressure Regulation Valve 2 Control Difference 
          P229A 00 [101] - Pressure too Low
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 185645 km
                    Date: 2022.05.20
                    Time: 10:55:49

                    Engine RPM: 1253.50 /min
                    Normed load value: 65.1 %
                    Vehicle speed: 34 km/h
                    Coolant temperature: 94 °C
                    Intake air temperature: 30 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 13.892 V
                    Unlearning counter according OBD: 40
                    Fuel high-pressure: actual value-FUP_FIL: 53.564 MPa
                    Fuel pressure regulator valve: specified value rail pressure-LV_PCV_CTL: 00000000 
                    Fuel level-FTL_CAN: 22 l
                    Fuel temperature-TFU: 48 °C
                    Fuel Metering Valve-VCV: 31.908 %
                    Fuel Pressure Regulator Valve-PCV: 33.826 %
                    Fuel high pressure commanded value_1-FUP_SP_KPA_ENVD: 96508.789 kPa


Readiness: 1 1 0 0 1