Hi all,

Could someone help me locate the boost sensor on my Audi A4 3.0 TDI Quattro? It has the BKN 204bhp engine (55 plate).

i think I've found 2 possible culprits, both on near side (passenger side).

One is on a metal box with Siemens VDO written on it, attached to a metal inlet pipe, BEHIND the headlight.

The other is UNDER the headlight, screwed into a box or pipe.

Both have same 4 pin connector, which is rectangular but with one of the short ends circular (like a church window).

Any help would be appreciated.