Where are the Knock Sensors on a 993?

[911cedric]

Hello,

i have an error code from the DME reading knock sensor 2.

I guess it's the sensor itself, because a bad fuel would have trigger both sensors from each cylinders banks. The engine rattles at idle.

I never changed one of those sensors and wonder were are they located, and how can i easily get to the bank 2 sensor?

i guess i will have to remove the air filter assembly, and maybe the air intake distributor?

any idea? let me know
thanks

Cedric

[Don Plumley]

Here's an illustration, it's right on top of the cylinder head. The workshop manual suggests reseating the connector to elminate contact resistance before replacing the sensor.

[911cedric]

thank you for the illustration!

but how do you get there?
i was thinking about removing the Fan assembly with the alternator to get under the engine shroud.
What do you mean by reseating the sensor?

[Don Plumley]

Unplug the sensor connector, check connections, replug. I looks like you do have to get under the shroud, which is why you want to check the electrical connections first.