Rep Power: 0

Okay so I have a 99 Honda civic Gx (cng) and its been acting really strange..I'll be driving and all off the sudden out of nowhere the battery light will turn on and my speedometer/odometer stop working aswell and the AC sometimes it will go right away but others it doesn't go back to normal until I turn the car off AnD back on..i have looked at the wire harness and took to intake manifold bracket off and really looked for a short but none to be found no fuses blown...when scanned with obd2 scanner p0501 p0135 p0141 come up any ideas /help is much appreciated