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 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Mercury Grand Marquis, and 2009 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
DTC 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: |
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| Diagnostic Aids: | Check the routing of the harness. Check the wiring and the connector for damage. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Manual Transmission | - | - | GO to Pinpoint Test DP . |
| Automatic Transmission | Refer to the AUTOMATIC TRANSAXLE/TRANSMISSION - 5R55S Cooling Symptom Chart, Diagnostic Trouble Code (DTC) Index to continue diagnosis. | ||