1999 Mazda Protege Questions

Unanswered 1999 Mazda Protege Questions

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I have read there is a temp sensor for the ECU (not the gage) that if reads hi will not allow the A/C to run. where is this bad boy located??
i ran a scan on the car and a code came up p1345 i was told that was the cam sensor so i replaced it and replaced the plugs and wires too. any thoughs.
I replaced the pistons due to loud knocking; replaced timing chain but not sure if it is correct. What should I check now??