Knock sensor


Asked by Jun 20, 2015 at 06:01 PM

Question type: General

I have a 2005 Impala. I took it to Sears and they said it was a
knock sensor code. And that I will have to take it to a Chevy
dealer. I checked gas cap but it still stays on. Would somebody
tell me what I can do. I was also told it might be electrical. I
don't have a lot of money. I'm on disability. Someone please

17 Answers

Do you have the code they pulled?



Ok That is indeed a knock sensor fault. It's sort of microphone that knows when detonation of fuel in cylinder, one of many sensors that control valve and ignition system timimg.. It is an electrical part. Do you know which engine you have, I found 3 possible a 2.4 a 3.2 or 3.4L then I can show where it is. You can replace it yourself with a few tools and a little automotive skill



I have been looking. The sensor look like this (actual part)

And there are two On lower left side of engine, near starter. and on lower right side of engine I's really sorry I can't find am image to show you. hope I was some help anyway

Here is something might help. Here and same other side of block click to size up


Can I drive it? Is it something I need to have fixed immediately? What is it for?

1 of 1 people found this helpful.

Is it expensive to have the dealer fix?

1 of 1 people found this helpful.

Afraid so. About $600 at shop and $800 dealer. Most of it is time is 9 hour job

You can drive it. But not for a long time, A few days or weeks maybe but it's part of timing, If it runs well now, you can go a while


Thank you so much for the information. Should I have this fixed immediately. What is a knock sensor?

1 of 1 people found this helpful.

But also that is BOTH. If they can determine which one is bad = ½ cost

See my secondpost. It 'listens' for when detonation occurs inside and helps ECU adjust

I can't imagine why the labor is that much. It comes from a book of labor time for every repair. and serves two purposes; 1) keep mechanics honest, no overcharging, and it works both ways for tham. If they do it in less time, they still get yo charge 'book time, but if it takes longer then too bad, not your fault it took so long and can't charge more than book time

I was also looking at some car forums, Impala and Camaro. There are guys that say they have taken theirs off, with no trouble. But That is just passing information, can't vouch for accuracy. But still, it's not an absolutely critical thing, maybe lose a bit of economy but will not damage engine


Thank you so much for the information. I really appreciate it.

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