I have a 2004 Neon. 134K, always done appropriate maintenance. Been a great car. Noticed 2 weeks ago, engine running rough at idle, going away after warm up. Took it for an oil change next day. About one week later, went to start it in the morning to warm up, and check engine light came on. Engine sounded "rough". Turned it off immediately. Discovered how to pull the P codes myself. It shows a oil pressure sensor low voltage, speed control switch stuck..and small leak in the emissions system. Went to the gas cap, it was basically not on at all, so I fixed that. (17 year old daughter driving it)
Went to start the car, to begin checking it, and the noise is louder than a ping..def a KNOCK now. Turned it off immediately, not wanting to cause further damage. Will the bad pressure sensor cause that noise? Going to get the part to replace it tomorrow. Hoping its not the pump itself. Any suggestions/comments?