Mk6 Golf - New throttle pedal required?!?

[CSR Performance]

2.0 TDI 140, throwing P0121. Any experiences please?

Assuming the potentiometer in the pedal is breaking down but not really sure how to confirm?

[normalbloke]

Get something that can read live data such as VCDS and prove/disprove it.

[CSR Performance]

Going to pick up a VCDS cable tomorrow. Obviously I can look at the live data from the pedal but what can I look at for the throttle body?

[catso]

CSR Performance said:

2.0 TDI 140, throwing P0121. Any experiences please?

Assuming the potentiometer in the pedal is breaking down but not really sure how to confirm?

My Son has a 1.4 tsi golf that had a throttle fault though it was P2138 'Accelerator Position Sensor'.

I believe P0121 is 'Throttle Position Sensor' and I would think the TPS is in the throttle body rather than the pedal?

Ours was cured with a new pedal which cost, IIRC around £125. I would suggest further investigation required before buying parts.

[CSR Performance]

Noted, thank you!

[stevemcs]

Sometimes the throttle body, sometimes the wiring to the pedal

[Cakey_]

I had the same code, which was solved by the garage adding longer wiring. I believe vw sell a kit.

They said that under acceleration the engine was tugging on the wires as it moved and causing the code to ping.

[CSR Performance]

That’s a new one on me! Can I ask what car it was and what mileage? Ours has just hit about 80k I think. Weird how it would suddenly just start now.

[GVK]

Have seen posts online (Scirocco groups) of this code and it was solved by cleaning the throttle body from soot/carbon

[CSR Performance]

GVK said:

Have seen posts online (Scirocco groups) of this code and it was solved by cleaning the throttle body from soot/carbon

Well it looks like this might well have been the issue...



Many thanks!

[GVK]

Yuk! Have you cleaned it out or replaced?

[CSR Performance]

Thorough clean. Seemed to be no issues with the opening of the butterfly valve afterwards so it’s gone back on.

[stevemcs]

You should carry out throttle body adaptation after cleaning it out.