I just bought a used 2000 Rodeo. It does have a few issues with it the check engine light is on. I took it in to auto zone and had the electrical test done and the two codes came up. The first one is P0140 the Isuzu HO2S12 Sensor Circuit, and a list came up with what all could cause the problem. Not really sure where to start or what to do to replace it.

P1627 Isuzu Module Supply Voltage Out Of Range. That is all I found on this. I replaced the battery connectors and of course I have no idea if this worked or if it is something completely different for the problem because of the first code is not yet fixed so the check engine light is still on.

Also the AC doesn't work, the dash lights won't work and the temp gauge doesn't work. I know this sounds like a lot but the vehicle itself runs good still and it starts right up. The gas gauge shows gas and the gas light comes on even if there is gas in there. Clearly it is inaccurate but it is trying to work. The speed/tachometer does work along with the blinkers and brights and blinkers. Another thing is that the radio was ripped out and the wires were just laying around. I am not sure if that caused a short somewhere or not. For $500 can't expect too much right from the start.

If anyone can help I would greatly appreciate it. Thanks.