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Assuming the engine is a 4.3L, bank 1 would be on the drivers side.
The 2003 GMC ambient air temperature sensor is located on the bottom of the drivers side mirror. If you look up at the bottom of the mirror you will see the sensor.
The temperature sensor on a 1998 Sonoma is located in the engine compartment just to the left of the distributor. Look for a plastic part that looks like a bolt that is held on with a clip and a small wire harness. It is on the top of the manifold.
The crankshaft position sensor on a 97 GM Sonoma 2.2 engine is located on the lower right side of the engine. It is near the ignition control module.
on the drivers side underneath the engine by the front tire. You will notice a pigtail leading to the exhaust in this area. This o2 sensor is the main sensor, there should be a catalytic o2 sensor located after the converter.
Coolant Temperature Sensor/Switch (For Computer)Locations View
The MAP Sensor on the GMC Sonoma is located in the engine compartment just to the left of the alternator. The MAP Sensor is usually colored silver or shows a gold tint.
The crankshaft sensor is located on the passenger side of the engine, close to the coil pack. It is easier to reach it from under a raised vehicle.
The sensor is down on the front of the oil pan just behind the crankshaft pully, which is located at the front of the engine.
On a 1998 it is about 3/4 of the way down the drivers side of the motor (4 cyl.) Middle of the block.
In the exhaust pipe in front of the catalytic converter...close to engine in crossover pipe
Depends on the engine, on the 4.3 TBI its on the passenger side screwed into the head between the first and second plug.