Knock sensor testing

[andyg plym]

Is there a way of testing the knock sensors ?

My 2nd one is coming up saying no signal/intermittent

Got a multimeter but unsure of how to check resistance etc in all honesty

Also I'm sure I read you can use golf sensors as they are just as good and cheaper....can anyone confirm ?

[UrS4boy]

Is there a way of testing the knock sensors ?

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".

[andyg plym]

Thanks dave I think that's answered the first question nicely

[UrS4boy]

G61/G66 Knock Sensor Information

Thanks dave I think that's answered the first question nicely

I don't think this answers the second question but it is my compilation of G61/G66 knock sensor info:

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

[andyg plym]

Dave that was a fascinating read, symptoms are the same as mine

[Val]

He's like walking Bible

[macspring]

He's like walking Bible

[UrS4boy]

He's like walking Bible

Sorry. Please don't bring religon into it. I don't walk on water (actually, I do, its Canada, eh? I just need some nice cold temps ) *and* I put my pants on the same way as everyone else.

Two legs in one hole, then falling on the floor

For more info, just click on these labels on the "Rosetta Stone":

http://members.shaw.ca/speedtek/UrS%20Engine%20Bay%20Device%20Map.html

[220bhp]

Knock sensors do not always throw a code ,at least mine didn't. when I bought my s2 around ten years, It never performed any thing like my standard s6 .We tested and swapped just about everything on the car with parts from the s6 with no success, and as the s6 continued to run ok with the s2 parts you can imagine how I felt. Until someone suggested that it could be a knock sensor problem. We had, we thought ruled this out as there was no code.
But in desperation I changed the front knock sensor and the car was transformed after nearly two years of frustration.
It may not be your problem , but the moral of the story is you wont know until you try.

[andyg plym]

Thanks mate very true

Before I pulled codes I had a feeling it was a knock sensor as I've had similar symptoms before, boost hits a max of 0.5 bar then stop and switch off, switch back on and full boost.

I will just buy a new one probably two