Hi all
I’m new here and have found the content on this chat extremely interesting.
I’m helping my sons uni student friend with a problem on their 2015 Skoda-NH-RAPID-SPACEBACK TSI 1-4L turbo.
It’s showing a P0033 error code which relates to the turbo bypass valve circuit. The turbo was changed by the mechanic that services the car but the code is still there and reappears after being cleared. I don’t know if the bypass valve was replaced (came with?) the new turbo however I would like to check the valve and wiring.
I’m wondering if anyone has a wiring diagram and/or pin out for the bypass valve and wiring back to the ECU as this would be very helpful.

Help on this would be greatly appreciated and thank you in advance for any assistance.

On 28/10/2025 at 06:54, Difaz said:

Hi all
I’m new here and have found the content on this chat extremely interesting.
I’m helping my sons uni student friend with a problem on their 2015 Skoda-NH-RAPID-SPACEBACK TSI 1-4L turbo.
It’s showing a P0033 error code which relates to the turbo bypass valve circuit. The turbo was changed by the mechanic that services the car but the code is still there and reappears after being cleared. I don’t know if the bypass valve was replaced (came with?) the new turbo however I would like to check the valve and wiring.
I’m wondering if anyone has a wiring diagram and/or pin out for the bypass valve and wiring back to the ECU as this would be very helpful.

Help on this would be greatly appreciated and thank you in advance for any assistance.

Did you get anywhere with this?

No success as yet. I don’t have a wiring diagram so I’m stuck until I can get that.

Finally found the problem. Corroded ECU pin. Moisture/ water has entered the plug at some point.

I carefully cleaned them and it is good now. Need to replace seal around electrical plug I would think to try prevent this from happening again.