23 is your intake air temp sensor. this sensor is either on the hose the goes between air filter or engine or air filter box, (most likely unplugged)
31 prndl switch this is the sensor/switch which tells the computer which position the transmission is in hence park, reverse, neutral, drive, and low. either the switch is bad or unplugged or wire problem or computer problem would need to be diaged
41 camshaft position sensor problem. this is not an easy problem to daig so don't replace any thing until 100% sure other wise will be very expensive. possible causes. bad cam sensor, bad ignition module, bad computer, bad wiring, I have seen the magnet on the cam sprocket fall off this is what the sensor uses.
