What sensors affect the timing on a 2003 Chevy silverado 1500

SOURCE: thermostat location 2001 chevy silverado 1500

The thermostat is in the hose on the passener side of the waterpump.It is in the part that has the three 10mm bolts.Please rate my answer, Thank you.

SOURCE: bad sensor on chevy truck

There are 2 both located in the block..

SOURCE: 2003 Chevy Silverado 1500 Error Codes

P0135 is a bad 02 sensor
P0442 is a evap problem
P0449 is a vent solenoid

i would check the vent solenoid first its a 4ws fuse under the hood in the fuse box make sure you have power to it you should have power at all times the ground comes from the pcm i think if you fix this everything else will work they are all computer controled

SOURCE: O.B.D. FUSE 2003 CHEVY 1500

Underhood fuse box (behind battery). may be labeled cigarette lighter or "aux pwr".

SOURCE: how to replace the knock sensor on a 1999 chevy

The knock sensor is llocated on the left side of the engine block and is a single wire connector. Disconnect the wire and simply unscrew the sensor. Don't worry. There will be no fluid leaking. No tricks.