MONITOR DESCRIPTION The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst informat
COMPONENTS ILLUSTRATION *1 BATTERY SERVICE HOLE COVER *2 HYBRID BATTERY SERVICE PLUG COVER *3 SERVICE PLUG GRIP - - N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 NO. 1 ENGINE UNDER COVER ASSEMBLY *2 REAR ENGINE UNDER COVER LH *3 REAR EN