want start code po340 i replace camshaft sensor eng still want start. .

once again, free code pull does not identify the failed part, just the area of failure. neons have a wire harness problem with both cam and crank sensors. disconnect the cam sensor and uncover the harness about 18 inches and see if the wires have been exposed and shorting together. if so, you need a connector repair kit to replace the harness and connector. Roy

You need to have a shop diagnose this with the proper equipment, it could be as simple as a bad wire or another sensor or as expensive as a new engine control module.