Hey guys I had my car to the garage twice for my engine light. Both times they replaced my knock sender. Got the car back today drove to work light back on. Any ideals why. 08 hhr lt

 

to the forum!

Dang good question really, P0325 is a knock sensor code, do you know if they have cleared the codes after performing the work?

They might have nailed the problem, but the stored code is triggering the CEL. Codes can "self clear" after a period of run cycles, each cycle consisting of an engine start, driving the vehicle, and then a shutdown. But it can take 10-15+ cycles to self clear a stored code.

Your first step should be quizzing the shop on whether they cleared the codes, if they have, then it's time to look at the connector and wiring harness going to the knock sensor.

 

Welcome to the site

If they changed the sensor twice I would guess that there may be a wiring issue. Some auto techs read the code then replaces the sensor with out doing electrical checks. This works about 70% of the time.

 

Thanks I will talk to the shop in the morning and let you know how I make out.

 

hey I talked to the shop and they reset the code and checked the wiring and can not find anything wrong.They are stumped.Guess it,s time to go to a dealer.

 

If they are using aftermarket parts you may try a factory knock sensor. Sometimes engine controller don't like aftermarket parts much.

 

Got a P0325 and after reading all the great information and the how to section I replaced sensor and no new error. This site is incredible and the first place I go. Thanks

 

I guess the OP is never coming back, so this is closed.

 

After 4 years, I think the OP might be driving a different car by now!