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

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2015 Lincoln Navigator, 2015 Lincoln MKZ, 2015 Lincoln MKX, 2015 Lincoln MKT, and 2015 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.

P0721 - OUTPUT SHAFT SPEED (OSS) SENSOR CIRCUIT RANGE/PERFORMANCE - DTC CHART

Description: This DTC sets when the OSS sensor signal input exceeds the calibrated threshold or has excessive electrical noise. The OSS signal is very sensitive to electrical noise. This electrical noise distorts the OSS input to the PCM.
Possible Causes: Incorrect OSS wiring harness routing Aftermarket add-on OSS wiring damaged OSS wiring insulation wear
Diagnostic Aids: Check the routing of the OSS wiring harness. Check the OSS wiring and the OSS connector for damage.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Manual Transmission	GO to Pinpoint Test DP .
Automatic Transmission	Refer to the service information , Automatic Transmission, Diagnostic Trouble Code (DTC) Index to continue diagnosis.