94 z71 running rich need advice

[Chvyhrtbt91]

Came up with code 15 CTS high circuit and 43 knock sensor error. I already changed my CTS so what could cause high circuit?

 

[Chvyhrtbt91]

Quick update. Code 15 cleared but 43 still on... Could this cause a rich underpowered issue?

 

[magimerlin]

Try this.... some have said it worked for them....

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