2008 chevy silverado 1500 PO205 & PO305? I replaced plugs & cables help?

Question

I got a PO205 & PO305 yesterday Morning I researched and I started with cbles and plugs.Didint work I cleared codes and they came back.I had PO420 about a month ago and chevy wants me to replace Catyallitc conv for 1700 could that lead to these new errors and whats next?

Answer 1

P0305 is a misfire for a number 5, you set a P0205  which is fuel injector circuit malfunction cylinder 5, If there is a problem with the fuel injector of number 5 it will set a misfire code for that cylinder, check that connection injector what happens in some case the terminal for the fuel injector gets disconnected, if its not you have a faulty fuel injector. a replacement of that fuel injector is more likely the fix, Now as for the P0420 The whole purpose of the CK ENG LT is to protect the catalytic convertor and the catalytic convertor protects the environment from harmful emission. Correct the misfire condtion which is the fuel injector once the misfire condition is gone clear the code, and see if P0420 returns, cross your finger

Read more : https://www.autocodes.com/p0205.html