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What is a P131 sensor and what does it control?

(1997 Dodge Ram Van 2500)
in Springfield, AR on October 18, 2012
My van is acting like it can't go into any gear except first without a drag at times and then at times its's fine. I had them check it at O'Reillys and their scanner said it was a p131 sensor but they didn't know what that was.
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Popular Answer
on October 18, 2012
02 SENSOR B1 S1 LOW VOLTAGE. NEED TO CHECK THE CIRCUIT AND TEST SENSOR BEFOR JUST REPLACMENT.
COULD BE EITHER CAUSING LIGHT TO COME ON. BUT NOT TRANS. RELATED.
on October 18, 2012
Ive checked for trouble codes and cant find that code you can check for code numbers at obd-codes.com
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