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i bought a 2000 s10 ls with a 2.2 from a friend . they were driving it down the road and it just died and they never figured out the problem. the day i went to get it i decided to check the fuses under the hood and the ecm 1 fuse was blown so i replaced it and drove it home. today i took it on about a 60 mile drive and when i got 1 mile from home it blew the ecm1 fuse again so i replaced it 4 times to get it home . i ran the codes on it and the only one is p0138 bank 1 sensor 2 voltage high can a bad o2 sensor short the ecm and blow the fuse ?
 

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Maybe if the O2 heater circuit was shorted to ground.

The P0138 is from the rear sensor on the driver's side, actual in your case (4 cylinder) it's the rear sensor.

The P0138 means the rear is not following the front and reporting voltages that makes the computer happy.
It could be from an exhaust leak somewhere between the 2 sensors
It could be from a poor wire connection at the sensor connector, or a damaged sensor wire.
Or, it could be a bad O2 sensor.

I doubt if it is blowing the fuse unless the wiring is burnt wire and grounded on the exhaust pipe.
 

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Check for a pinched wire at the ECM mounting or corroded connectors on it.
 
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