'90 Jetta Carat Wolfsburg Edetion Sensor?

[DrtBikDave]

Anybody out there know what sensor or sending unit is bolted to the side of the block just behind the radiatur hose. It looks to be foil wrapped and has a 2 prong connector?

[DrtBikDave]

Come On some of you auto techs have to have some Idea what that sending unit is for and it's importance.

[Doug Tatham]

It's the Knock sensor. It feeds information to the engine computer and is rather important to the proper operation of the engine. They're about the most expensive sensor on the car, $45 or so online. They are easily damaged, so be careful how much you tighten it.

[DrtBikDave]

Thanks for the info, I will get one tomorrow.

[denisond3]

If the knock sensor died, I would just run higher octane gas until I got it fixed.