Need to know where the o2 Sensor is located on a 1998 Rodeo.

which engine do you have, the 2.2 or 3.2
an O2 sensor looks very much like a spark plug with a any where from 1 to 4 wires coming from the end
theses photos are rodeo O2 sensors

I don't know what an "01 Sensor" is, but the O2 sensors which sense oxygen (O2) in the emissions are located on the exhaust pipes behind the engine and before the mufflers. If you have a V6 engine, there will be a total of 4 O2 sensors, 2 on each side of the exhaust system. You will need an open ended wrench to remove the old ones as you need to be able to get around the sensor and the wire that goes to it. Unplug the connector before loosening the sensor, it'll be easier than twisting the cable/wire until the sensor come out. You may need some WD-40 also to loosen up the sensor if they've been there a long time, but don't start your vehicle until the WD-40 or whatever you use dries off. It could ignite from the heat in the exhaust pipe when the engine is running.

follow your exhaust system starting at the exhaust manifold to the catalytic converter could be 2 or may have four

The O2 sensors are located in the exhaust pipe just off the exhaust manifold. Here is a picture of your particular O2 sensor, some are slightly different looking it depends on the manufacturer. You will need to get under the truck to replace the sensor it takes a special 7/8" O2 sensor socket, about $5 from Autozone.

this code is oxygen sensor heater circuit range/performance(bank2,sensor1)
the ECM detects the heated oxygen sensor internal resistance is not in specs for 6 seconds code sets
disconnect O2 sensor,switch ignition on engine not running and measure the voltage with a multi meter between O2 sensor reference signal circuit and low reference signal circiut(vehicle side of wiring) should read 350-550mV
possibly O2 sensor broken(faulty) replace

There is no oxygen sensor there, it is located in the exhaust.

The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.

check to see if AC and HEATER blower motor is getting power .if yes replace blower motor.if no you have problems in relay- fuse- or ac and heater switch is bad.for sun roof check for power at switch if yes sun roof eletric motor need replace.or sun roof in a bind.if no power to sun roof switch.blowed fuses and bulbs or turn signal switch is bad.

Tune it up and replace the 02 sensor that keeps setting the codes bank 2 sensor 1. Have your oil and filter changed right before you go for a retest to. That will clear up 3 codes P0300, 0155 and 0154. You might have to replace the fuel sending unit to get rid of P0463 but if the gauge works OK I'd leave it alone.

You need to replace the speedometer gear that drives the sensor.