Cadillac Repair: knock sensor for 2000 cadi catera, oil pressure gauge, electronic scanner

Question
well my engine light came on ant codes that we pulled are p0325, 0171, 0174, and p1511. now the has a rought start after being parked for long, and when it drives no power at times when i step on the gas, and also the oil pressure gauge falls low till an alarm and light comes on.
the other thing is it has a rough idle too
can you make out what the problem could be and what i need to do

Answer
When a knock sensor detects any abnormal noises in the engine it will put the P0325 knoxk sensor bank 1 sensor light ON.

The sensor is located by the starter on the side of the engine block.

The FIRST think you have to do is have the engine checked to make sure that it does not have a mechanical fault that is causing this knocking sound.

Once you get the engine diagnosed as not having or having a mechanical fault in the engine then you can either take a chance and replace the knock sensor or you will have to have an electronic scanner put on the computer system to diagnose any other faults.

You MUST fix the P0325 code FIRST before you proceed to the other codes as the first code could be causing the other 2 codes.