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On the drivers side of engine towards the back of the engine beside the knock sensor
Unfortunately there is no fixing an O2 sensor. If the "check engine" light is on due to an O2 sensor, it can only be remedied by replacing the bad sensor.
Front, lower, passenger side of engine.
Start by replacing the Engine Coolant Temperature Sensor
If an engine light is still on after replacing a fan's radiator sensor in a RFW engine the coolant sensor should also be checked. If the coolant sensor is bad it will send an error code to the car's computer.
The 2000 GMC throttle position sensor can be found on top of the engine. The throttle position sensor will be near the injector fuel pump.
The map sensor on Safari 4.3 L and Astro vans are accessed through the inside engine cover. Once you remove the engine cover you can spot the air intake for the throttle body . The map sensor is to the right of the air intake (passenger side) about 2 - 3 inches, towards the rear of the van
Try replacing the engine coolant temp sensor.
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Make SURE the engine is COLD. Then unscrew the old sensor and install the new one. Antifreeze will leak out of the engine so be quit when replacing it.
It depends on which 'sensor' you are replacing. The crankshaft positioning sensor is on the lower left side of the engine, behind the oil filter. The CPS attaches to the bell housing. Search youtube for videos on replacing this particular sensor. Other videos may assist with other sensors.
Try replacing the engine coolant sensor.