service engine light on

I have a 95 s10 with a vortek engine. I tried the jumper method to get the code and here is what came out not sure how many codes this is. Each set flashed 3 times, (1 flash then 2) (1 flash then 5) (3 flashes then 2) (4 flashes then 3) any help with this would be greatly appreciated.

15-low temp indicated
32-egr
43-knock sensor
code 12 will always be displayed, its like a communication test code or soemthing. its irrelevant. have you done anything to the truck recently?

15-low temp indicated
32-egr
43-knock sensor
code 12 will always be displayed, its like a communication test code or soemthing. its irrelevant. have you done anything to the truck recently?
Ok a lil update, vehicle also had a hard starting problem after running and being shut off for a while, cranks like 20 secs before it starts and blows a puff of smoke out the tail pipe. Today i replaced both temp sensors,temp gauge wasnt working either, guage works now but still have same starting problem. I reset the computer and now im just getting the 43-knock sensor code

Ok a lil update, vehicle also had a hard starting problem after running and being shut off for a while, cranks like 20 secs before it starts and blows a puff of smoke out the tail pipe. Today i replaced both temp sensors,temp gauge wasnt working either, guage works now but still have same starting problem. I reset the computer and now im just getting the 43-knock sensor code

The hard start may be do to a leaking CPI and/or nut kit.,..Pull your upper plenum and check for washing. Also run a pressure test on your fuel system. Clamp off the return line. If it doesn't hold pressure your fuel pump could be dying out. Your pressure should be at 56-60 to start.

For the knock sensor you need to replace it.

You have 2, 1 on the driver's side of the block. Between and below the 3 and 5 plugs. And you will have another 1 on the back of the passenger side head against the firewall.