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P0721 Diagnostic Trouble Code Discussion for June 2005

Output Shaft Speed Sensor Circuit Malfunction

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Trouble Ticket Help Requests for DTC P0721
Help Request Posted
2000 Ford Mustang GT 4.6L Surge, o/d light flashing VIN: 1FAFP42X5Y
P0721: speed sensor. PO721 OUT PUT SPEED SENSOR. The speedometer will bounce between 30 and 50 and the trans will shift up and down. it might go 3 hours or so before it will act up. we replaced the sensor twice twice with ford parts. if i scope the sensor at the pcm it doesn't dro...
June 24, 2005