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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 765 (Engine Controls - Powertrain DTC Charts & Description (Except Diesel & Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P0721: Output Shaft Speed (OSS) Sensor Circuit Range/Performance

DTC P0721: Output Shaft Speed (OSS) Sensor Circuit Range/Performance

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0721 - OUTPUT SHAFT SPEED (OSS) SENSOR CIRCUIT RANGE/PERFORMANCE

Description:  The OSS sensor signal is very sensitive to noise. This noise distorts the input to the powertrain control module (PCM).
Possible Causes: 
  • Wiring misrouted
  • Aftermarket add-on
  • Wiring damaged
  • Wiring insulation wear
Diagnostic Aids:  Check the routing of the harness.
Check the wiring and the connector for damage.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Manual transmission - - GO to TJ: Output Shaft Speed (OSS) Sensor STEP TJ1.
All others Refer to AUTOMATIC TRANSMISSION .
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