error codes 0128 and 0418 on 2001 s-10 Blazer

i have 2 codes 0128 and 0418 and i know the definitions but need to know what do i do to fix? Replace thermostat? replace relay?? Thanks for any help

I have reset the codes......

i have 2 codes 0128 and 0418 and i know the definitions but need to know what do i do to fix? Replace thermostat? replace relay?? Thanks for any help

I have reset the codes......

On code 128 install a good stat.
Code 418 is relay circuit.

Check all wiring to and from it.
The good repair manuals have a repair flow chart for that 418 code.
The VCM grounds relay to turn on injection pump.
Is the VCM grounding it when it should turn on?
Or does relay turn it on when relay is grounded.
Also check all fuses.

Check in the s-10 how to forum on air injection pump.