Knock Code on 2000 Camry

The check engine light came on the other day and i took it in to see
what was wrong. They ran a diagnostic test and said that the Knock
sensor was malfunctioning. He said i had to replace the knock sensor
which would cost about $250.

I'm a little concerned about this because shouldn't they have atleast
tested the sensor to check resistence?
what if the sensor is fine and there really is a "knocking" problem?
I realise that it may be difficult to check the sensor but my car is a
4 cylinder and from what i'm told it appears it is easy to get at.

i don't know a lot about cars but simply replacing a sensor that shows
a malfunction doesn't really seem like a solution.

Any ideas?

Thanks for the response. I took it into my local Toyota dealership
and the service advisor said (after charging me $90 for the scan) that
the scan shows a "knock sensor" code but they "claim" they checked
everything and its all fine so therefore he felt that the knock sensor
is gone and i should get a new one. I'm not sure if he did any of the
testing you listed but i'm not hearing anything wrong with my engine
so i don't know what to do. He made it sound like just get a new
sensor and the problem will be solved. Surely there must be some kind
of testing to make sure the sensor itself is working or not before
making such a recommendation.

Maybe i should take it to another mechanic to see whats wrong. THe
last thing i want to do is put in a new sensor and have the light go
off again.

"ajay_987654" <hassnein@yahoo.com> wrote in message
news:1170453899.423142.51980@j27g2000cwj.googlegroups.com...[color=blue]
> Thanks for the response. I took it into my local Toyota dealership
> and the service advisor said (after charging me $90 for the scan) that
> the scan shows a "knock sensor" code but they "claim" they checked
> everything and its all fine so therefore he felt that the knock sensor
> is gone and i should get a new one. I'm not sure if he did any of the
> testing you listed but i'm not hearing anything wrong with my engine
> so i don't know what to do. He made it sound like just get a new
> sensor and the problem will be solved. Surely there must be some kind
> of testing to make sure the sensor itself is working or not before
> making such a recommendation.
>
> Maybe i should take it to another mechanic to see whats wrong. THe
> last thing i want to do is put in a new sensor and have the light go
> off again.
>
>[/color]
If the warranty has expired on the car, I would wait to see if the check
engine light comes back on. Unfortunately, the I don't think the knock
sensor is not covered by the emissions warranty (check your warranty book to
confirm). If the check engine light comes back on, take it to a place that
will let you use the OBD II code scanner for free like AutoZone and check
the codes. If the code is the same one as noted on the repair order from
the dealership, then go to the dealership and purchase the part from the
parts department and replace it yourself. Replacing the sensor involves
unplugging a wire from it, unscrewing the sensor from the engine block, and
reversing the process.

Good luck!
--

Ray O
(correct punctuation to reply)