Special Tools Required
Disconnect the secondary HO2S connector (A).

Raise the vehicle on a lift.
Remove the supporters (A), then remove the secondary HO2S (B).

Install the parts in the reverse order of removal.
HandsFreeLink System Description
HandsFreeLink Control Unit Connector for Inputs and Outputs
...
Transmission End Cover Air Check Valve Inspection and Replacement (A/T)
NOTE:
There are two types of the transmission end cover; the type A and the
type B; and both types are available.
The differences between the types A and B of the end covers are:
...
Spark Plug Inspection
Remove the ignition coils and the spark plugs.
Inspect the electrodes and the ceramic insulator:
Burned or worn electrodes may be caused by these conditions:
...