REMOVE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR
Remove the 4 bolts and No. 1 exhaust manifold heat insulator from the exhaust manifold converter sub-assembly (TWC: Front Catalyst).
REMOVE AIR FUEL RATIO SENSOR
Disengage the 3 wire harness clamps.
Disconnect the air fuel ratio sensor connector.
Using SST, remove the air fuel ratio sensor from the exhaust manifold.
Note
If the air fuel ratio sensor has been struck or dropped, replace it.