2002 Silverado 5.3L Check Engine Codes P0420, P0327, P0440

[Gito]

5.3L Silverado with 366k miles.

Check Engine light with the following codes;

P0420 Catalyst System Low Efficiency (bank 1)
P0327 Knock Sensor Circuit Low Input (bank 1)
P0440 Evaporative Emission System

Could this be a bad drivers side Catalytic Converter

Any advice is greatly appreciated

 

[dogememe]

Is this the original engine? Sorry it's off topic but just curious. You likely have more than one issue causing these codes. I'd fix your knock sensor code first and then your evap code and then worry about the cat later...

 

[Gito]

Codes were obtained from Azone.
Drove to PBoys and only got P0420

 

[Jethro_Bob]

/off topic/ a new battery recently fixed my p0420 and my TPS (forgot #) codes on my 98 s10. If your codes appeared around the same time, try charging and then testing your battery.