1. Disconnect the negative battery cable..
2. Remove the inner garnish..
3. Remove the front door trim..
4. Remove the front door speaker..
5. Verify the resistance between the front door speaker terminals.

If not within the specification, replace the front door speaker.

Without Bose®: 3.4—4.6 ohms
With Bose®: 1.83—2.47 ohms
Front Center Speaker Removal/Installation
Front Door Speaker Removal/InstallationBack door
In the Subaru Solterra, the back door can be conveniently locked,
unlocked, opened, and closed using several intuitive methods, ensuring both ease
of use and a high level of safety during everyday operation.
WARNING
Carefully follow all safety precautions when operating the Subaru Solterra
b ...
Transaxle Fluid Temperature (Tft) Sensor Inspection [FS5 A EL]
CAUTION:
Water or foreign objects entering the connector can cause a poor connection
or corrosion. Be sure not to drop water or foreign objects on the connector
when disconnecting it.
On-Vehicle Inspection
1. Perform the following procedures.
a. Remove the battery cover..
b. ...
Air Fuel Ratio (A/F) Sensor Inspection [Mzr 2.0, Mzr 2.5]
A/F Sensor Inspection
1. Connect the M-MDS to the DLC-2.
2. Switch the ignition to ON.
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs using the M-MDS..
VSS (Vehicle speed)
RPM (Engine speed)
O2S11 (A/F sensor output current)
...