knock sensor & idle air control valve

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maxxer - 07 Jun 2005 23:56 GMT

Someone please advise. 2000 frontier, V6, 5spd, 4wd, 4door, 57000 miles.
MY service engine soon light came on. I went to AutoZone and the codes said
I needed to replace the KNOCK SENSOR,
and the IDLE AIR CONTROL VALVE. My question is: is there a problem that
could be causing these sensors to be acting up and I need to fix that
instead? These sensors are located under the intake manifold. I don't want
to tackle this job myself.
Any help will be appreciated.

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JimV - 08 Jun 2005 01:22 GMT

> Someone please advise. 2000 frontier, V6, 5spd, 4wd, 4door, 57000 miles.
> MY service engine soon light came on. I went to AutoZone and the codes said
[quoted text clipped - 5 lines]
> Any help will be appreciated.
>

The knock sensor is a common false positive. Replace the IAC, reset the
ECU and see if the KS error returns.

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Zoso - 09 Jun 2005 02:48 GMT

> Someone please advise. 2000 frontier, V6, 5spd, 4wd, 4door, 57000 miles.
> MY service engine soon light came on. I went to AutoZone and the codes said
> I needed to replace the KNOCK SENSOR,
> and the IDLE AIR CONTROL VALVE.

Codes don't tell you to replace anything, they only tell you what area to
check. The factory service manuals contain diagnostic trees for each code;
you can also get this from a service such as "alldata.com" or similar. You
can throw away a lot of money replacing parts without solving the problem.

My question is: is there a problem that

> could be causing these sensors to be acting up and I need to fix that
> instead? These sensors are located under the intake manifold. I don't want
> to tackle this job myself.

Very often the IAC just needs to be taken off and cleaned well, using a
throttle body cleaner spray. But it sounds like you might want to hire
someone else to chase this down.

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