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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 753 (Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline) >> Diagnostic Trouble Code (DTC) Charts >> P0721 - Noise Interference On The Output Shaft Speed Sensor Signal

P0721 - Noise Interference On The Output Shaft Speed Sensor Signal

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0721 - NOISE INTERFERENCE ON THE OUTPUT SHAFT SPEED SENSOR SIGNAL

Description:  The output shaft speed sensor signal is very sensitive to noise. This noise distorts the input to the PCM.
Possible Causes: 
  • Wiring misrouted.
  • After market add-on.
  • Wiring damaged.
  • Wiring insulation wear.
Diagnostic Aids: 
  • Check the routing of the harness.
  • Check the wiring and connector for damage.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Manual Transmission - - GO to TJ: Output Shaft Speed (OSS) Sensor Introduction STEP 1
All Others - - Go to the appropriate AUTOMATIC TRANSMISSION article.
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