VW Fox 1.4 TDI: Specs, Review & Price

Translated on 22-09-2026, 7:53.

Hi.

My daughter's Fox, a 2006 1.4 TDI with a BNM engine, had its air conditioning system recharged today. During the subsequent test drive, it didn't perform well, and the check engine light came on.

Selected, boost pressure control valve N75, short circuit to positive.

It reappears immediately after being deleted.

I was looking for the N75 valve, but I couldn't find it. All the vacuum hoses seem to go to the block located on the right shock absorber tower.

Did I miss something?

Translated on 22-09-2026, 7:55.

Hi,

In some TDI engines, various magnetic valves are grouped together in a single unit and are no longer separate components.

Best regards, Rainer.

Translated on 22-09-2026, 7:55.

So, the turbocharger boost pressure, EGR system, and other components are centrally controlled.

Translated on 22-09-2026, 7:55.

I assume that's the case. After all, the block is simply a collection of valves housed together.

Best regards, Rainer.

dieselschrauber · Translated on 22-09-2026, 7:56.

Quick update: I bought a used control unit from a seller on eBay for 14 euros, installed it, cleared the error memory, and the car is running properly again. The Fox now has 70 horsepower again, instead of the 30 it felt like it had before.