knock sensor code

[jfpty5]

The check engine light came on a couple weeks ago on my yukon xl. it goes off sometimes, but late comes back on. I took it to autozone to read the code and they said it was both knock sensors not communicating. Has anyone else had this issue? What should I check before removing the manifold to replace the sensors? I have a 2003 yukon xl 5.3 flex fuel. Thanks.

 

[slocaddy]

You can check their Harness plug on the drivers side of intake. I just replaced mine about a month ago. Its a good idea to replace the knock sensor harness also.

 

[Volant1]

the knock sensors are just like the fuel pumps on the tahoe's sooner or later they will go bad. You will need 2 knock sensors, the harness and head gaskets

 

[bkboatnsleds]

Intake gaskets - not head gaskets.. Make sure you get the UPDATED intake gaskets.

 

[slocaddy]

he meant intake gaskets, wich even though they are supposed to be re-useable it is better to replace.

dang i type slow

 

[jfpty5]

Thanks everyone for the info. How can you tell if the intake gasket is the updated one?