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DTC P0720: Output Shaft Speed (OSS) Sensor Circuit

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
P0720 - OUTPUT SHAFT SPEED (OSS) SENSOR CIRCUIT

Description:  The OSS sensor inputs a signal to the powertrain control module (PCM) based on the speed of the output shaft of the transmission.
Possible Causes: 
  • OSS circuit short to ground
  • OSS circuit short to voltage
  • OSS circuit open
  • Damaged OSS sensor
Diagnostic Aids:  Verify the sensor signal output varies with the vehicle speed.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Manual Transmission GO to PINPOINT TEST DP .
Automatic Transmission Refer to the appropriate Automatic Transmission, Diagnostic Trouble Code (DTC) Index to continue diagnosis.
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