knock sensors

[andy j]

I noticed both my knock sensors have splits in them on my aby avant. Are the following part numbers correct for my car?

054 905 377 G
054 905 377 A

[UrS4boy]

G61 and G66 Knock Sensor Info

I noticed both my knock sensors have splits in them on my aby avant. Are the following part numbers correct for my car? 054 905 377 G (and) 054 905 377 A

Correct

054905377A is the 740 mm long green one for the front location

054905377G is the 535 mm long blue one for the rear location

S2driverUK on the S2 forum provided these PNs with corresponding Bosch PNs:

Knock Sensor - Brown 3B ---- 077 905 377 A ------ 0 261 231 040
Knock Sensor - Green 3B ---- 054 905 377 A ------ 0 261 231 038
Knock Sensor - Blue ABY ---- 054 905 377 G ------ 0 261 231 036
Knock Sensor - Blue ABY ---- 054 905 377 -------- 0 261 231 036
Knock Sensor - Green ABY --- 054 905 377 A ------ 0 261 231 038

G61 and G66 Knock Sensor info:

http://forums.quattroworld.com/s4s6/msgs/21047.phtml

[andy j]

Thanks.

[220bhp]

Be carful when you replace these, as it is very important to torque them to the correct
amount.
Its very low around 10 nm. I cannot remember if that is correct so do a search to make sure.
The main difference is the length of the cable.

[Laaf]

20 Nm is the torque to use for them. M8 bolts in general 20 Nm, some harder/stretch 25 Nm.

[andy j]

Thanks for that!

[UrS4boy]

Be carful when you replace these, as it is very important to torque them to the correct amount. Its very low around 10 nm. I cannot remember if that is correct so do a search to make sure. The main difference is the length of the cable.

The torque amount is in my G61 and G66 knock sensor info link I posted above.
(G61 and G66 knock sensor info: http://forums.quattroworld.com/s4s6/msgs/21047.phtml )

Where it says:

From the C4 UrS Robert Bentley manual, pg. J28-27:

"The knock sensors cannot be checked electrically. Check DTC memory => Repair Group 01. For satisfactory function of the knock sensors, exact compliance with the tightening torque of 20 Nm (15 lb ft) is important. Check the harness connection from knock sensor to wiring harness for corrosion".