P0326 and P0446 codes on 2007 Tahoe LT

[vdub77093]

In regards to the P0326.....where are the knock sensors located. Secondly the P0446....I've changed the gas cap as well as the Evap purge solenoid valve. Any suggestions?

 

[donjetman]

In regards to the P0326.....where are the knock sensors located. Secondly the P0446....I've changed the gas cap as well as the Evap purge solenoid valve. Any suggestions?

Knock sensors are bolted on each side of the block.
and
Vapor Canister Vent Valve on my Denali w/6.2 it was GM 23481275

 

[vdub77093]

Thanks I'll try the Vapor Canister Vent Valve next.