i have just gone through this same situation, in my case it follows with i think 1157 or 1137 regardless they are o2 sensor codes. funny enough this , in my case, led to the MAP sensor found center rear of intake manifold. worked for me 100 CAD new pop it out and replace it should be good as new!
Good luck
PO341 Camshaft Position Sensor Circuit Range Problem
Trouble code P0463 means:Fuel level sensor circuit high input
Trouble code P0461 means:Fuel level sensor circuit range/performance
Trouble code P1326 means: ION Sensing Module Combustion Quality
Trouble code P0507 means:Idle control system RPM higher than expected
Trouble code P0442 means: Evaporative Emission System Leak Detected (small leak)
oxygen sensor
Not a valid code. If it's P0134 the it would be oxygen sensor bank 1 sensor 1, no activity detected.
4x4 indicator light
it is low coolant temperature, could be the thermostat could be the sensor for coolant temperature.
The check engine light on a 1997 Isuzu Rodeo could mean a failure in the ignition system has been detected or one of the cylinders has misfired. Hooking an OBDII code reader to the vehicle can determine the exact cause.
Well I just checked about 6 sites that list Isuzu specific obd2 codes. Problem is, not a single one of them list that code. Are you sure it's the right code? If it is, you're probably going to have to ask a dealer or mechanic. If you mean P0128 that's a thermostat insufficicent temp and it req's a t-stat