Our SII from 2014 has only done 55000 M. A couple of years ago - during corona - the car went into limp mode with P00AF -9126 and 9127 -  and it did not return for another year. Admittedly I had not done that many miles. A call to Skoda was sobering - £1600 please. This would have been for a completely new turbo. The CFGB turbo is made by Garrett and would be complete with actuator and manifold. It is a pain to get to apparently. Some others are easier to service and even have parts replaced.

As the DTC did not return I decided to leave things as they are. The limp mode did return a week before we wanted to take the car to France. This engine without turbo in the mountains would be a right pain. I decided to try the MR. MUSCLE treatment I had read about on the internet. There was no time for a Skoda repair.  The MR. MUSCLE treatment was on a 1.9L TDI and access was not the easiest. They detached the exhaust and used MR. MUSCLE into the exhaust end of the turbo. My access was even worse plus there is a DPF / pre cat in the way. but this was also the plus point. The DPF has a pre filter temperature sensor which allows access into the turbo.

 

 

I removed the heat shield - red circles on the left - which is held in place with 3x 10mm nuts. Then I removed the heat shield for some wires just at the bulk head and loosened them from a bracket - green arrow. The temp sensor wire needs some wriggle room. Then I removed the temp sensor on the DPF. I sprayed MR. MUSCLE into the turbo red arrow in the centre - a few times and blew it out switching the engine on. It is a bit of a palaver as I fitted and removed the sensor and allowed parts to cool down again.

I had removed the connection to the turbo actuator, which is not really necessary.

 

You have to change the original MR. MUSCLE nozzle for one on a WD40 large bottle - I have spare WD40 can with a MR.MUSCLE nozzle now.

 

The car / fix has lasted well. No coil warning and no limp mode.

This fix cost me an afternoon and £3.99 for MR. MUSCLE and £3.50 for WD40 with a club card from Tescos.

 

This was the VCDS readout:

                Address 01: Engine       Labels: 03L-906-018-CFF.clb
Control Module Part Number: 03L 906 018 RS    HW: 03L 906 018 MH
  Component and/or Version: R4 2,0L EDC   H28 5357
           Software Coding: 001D0032042701080000
            Work Shop Code: WSC 33361 790 00999
              ASAM Dataset: EV_ECM20TDI01103L906018RS 003003 (SK46)
                       ROD: EV_ECM20TDI011_SK46.rod
                      VCID: 0C17C779A71A1EEFA3-8058
3 Faults Found:

5172 - Boost Pressure Regulation
          P0234 00 [096] - Limit Exceeded (Overboost Condition)
          Intermittent - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 91232 km
                    Date: 2097.14.12
                    Time: 14:40:44

                    Engine RPM: 2195.50 /min
                    Normed load value: 62.7 %
                    Vehicle speed: 111 km/h
                    Coolant temperature: 92 °C
                    Intake air temperature: 28 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 14.620 V
                    Unlearning counter according OBD: 40
                    Charge air pressure: specified value: 1829 hPa
                    Charge air pressure: actual value: 2216 hPa
                    Air mass: actual value (mg/stroke): 698.5 mg/stroke
                    EGR Solen.val.: actual value: 99.90 %
                    Throttle valve adapter: actual value: 24.95 %
                    Charge air pressure actuator: acknowledgment: 61.78 %
                    Mean injection quantity: 27.68 mg/stroke

9126 - Actuator Module for Turbocharger 1
          P00AF 00 [101] - Stuck
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Mileage: 91232 km
                    Date: 2097.14.12
                    Time: 14:40:47

                    Engine RPM: 2240.50 /min
                    Normed load value: 56.1 %
                    Vehicle speed: 113 km/h
                    Coolant temperature: 92 °C
                    Intake air temperature: 24 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 13.380 V
                    Unlearning counter according OBD: 40
                    Charge Pressure Actuator: activation: 5.13 %
                    Charge air pressure actuator: acknowledgment: 48.52 %
                    Turbocharger boost control: offset closed: 0.23 %
                    High press turbocharger actuator: status-Bits 0-7: 55
                    High press turbocharger actuator: status-Bits 0-7: 0
                    High press turbocharger actuator: status-Bits 0-7: 0
                    High press turbocharger actuator: status-Bits 0-7: 8
                    High press turbocharger actuator: actual uncond volt value: 2389.8 mV
                    Accelerator pedal travel: 0.00 %

9127 - Actuator Module for Turbocharger 1
          P00AF 00 [101] - Stuck
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Mileage: 91261 km
                    Date: 2097.14.12
                    Time: 14:57:33

                    Engine RPM: 1347.50 /min
                    Normed load value: 0.0 %
                    Vehicle speed: 29 km/h
                    Coolant temperature: 88 °C
                    Intake air temperature: 18 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 14.820 V
                    Unlearning counter according OBD: 40
                    Charge Pressure Actuator: activation: 10.00 %
                    Charge air pressure actuator: acknowledgment: 17.00 %
                    Turbocharger boost control: offset closed: 0.23 %
                    High press turbocharger actuator: status-Bits 0-7: 63
                    High press turbocharger actuator: status-Bits 0-7: 0
                    High press turbocharger actuator: status-Bits 0-7: 0
                    High press turbocharger actuator: status-Bits 0-7: 40
                    High press turbocharger actuator: actual uncond volt value: 3398.6 mV
                    Accelerator pedal travel: 0.00 %

 

Edited 7 September, 20223 yr by 26DIPP

This used to be a trick i done on my old 1.9pd audi. Fill the turbo with mr muscle and pump it in using some washer hose. Leave it over night and wiggle the actuator to free it up a bit. Prevented any further issues luckily.

Lidl oven cleaner foaming spray works just as well.

I had done output tests and pressure tests and the actuator and hoses were intact, so the last bit part was sooted up turbo variable vanes.

 

@J.R.

Does the Lidl oven cleaner come with a flexi spray nozzle or take the WD40 one?

I cant recall what i did 5 minutes ago let alone what nozzle the oven cleaner I used over 5 years ago came with!

 

I can see no reason why any oven cleaner would have a flexible nozzle.