DTC P0721: Output Shaft Speed Sensor Circuit Range/Performance: Notes

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

1. -

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

No lock-up occurs.
The engine stalls when the vehicle is stopped.
Shift control malfunction

CAUTION:

After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure. Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE

CHECK DTC .
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)

Besides DTC P0721, is any of the DTC P1706 or P0500 displayed?

Yes : Perform the diagnosis according to DTCs other than P0721. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST

No : Perform the diagnosis according to DTC P0720. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0720 OUTPUT SHAFT SPEED SENSOR CIRCUIT