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Did you verify the sensors were faulty before you replaced them ? Code 1345 means the signal from each sensor is not in sync with the other. That means one sensor signal is out of sync, or there is a problem with the timing chain.
Codes 171 and 174 deal with the issue of the fuel system being too lean on both banks or heads. You could have compression or fuel problems that would cause those codes.
A mechanic would use a scanner to monitor data from the sensors and try to figure out whats going on.
you can test the cam shaft sensor ,but you will need a lab scope. depending on what type of sensor if its a 2 wire sensor it will produce a a/c signal, if it a 3 wire sensor it will produce a square wave signal. but with out a lab scope. it just a guess
Code 1345 is for a problem with the sync of the crank and cam sensors. Code 1250 is for a problem with the EVAP system that vents the gas tank. And code 300 is for a random miss. I would have the crank and cam sensors tested first. It could be a sensor or a problem with the timing belt.
error code p1345 ( gm and chevy) = camshaft and crankshaft position error code. a tooth or timing chain has excessive wears. BMW error code P1345 = cylinder 2 misfires, fuel cut off. all of it, cause the engine lose power.