6N2 Polo GTI Power Issue

[Craigza]

Hi Guys firstly would like to thank anyone who takes the time to read this, new member... new car... be gentle.

So recently had the gearbox changed and since driving back from the garage the car intermittently is losing power, first time this happened the Engine check light came on.

It idles fine but when driving you will be accelerating and all of sudden with foot at the same pressure on accelerator the power drops and then comes back, this happens very randomly without pattern.

I've had a friend read the codes using VCDS and this is what come up:

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Address 01: Engine Labels: Redir Fail!
Part No: 036 906 033 D
Component: 1.6l/4V
Coding: 00031

4 Faults Found:
16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
P0130 - 35-00 - -
16556 - Fuel Trim; Bank 1: System Too Rich
P0172 - 35-10 - - - Intermittent
16556 - Fuel Trim; Bank 1: System Too Rich
P0172 - 35-10 - - - Intermittent
16706 - Engine Speed Sensor (G28): No Signal
P0322 - 35-10 - - - Intermittent
Readiness: 0000 0000

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Address 08: Auto HVAC Labels: 3Bx-907-044.lbl
Part No: 3B1 907 044 C
Component: CLIMATRONIC C 0.7.0
Coding: 04001
Shop #: WSC 00788
VCID: 214DE1B784ED

1 Fault Found:
01274 - Air Flow Flap Positioning Motor (V71)
37-00 - Faulty

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I have a feeling from the above it's possibly the pre-cat Lambda sensor, possibly damaged when the new gearbox went in? Any thoughts/ opinions would be great, just don't want
to get mugged off when I go back

Thanks again.

[leescreen123]

Try cleaning out the throttle body, its a known issue on gti's for it to get dirty.. ( Buy some carb cleaner from halfords, remove the airbox, and give it a good clean) this may help your problem!

[joe2612]

Check the wiring at the precat lambda plug. They are very fragile and break easily during a gearbox fitting.