| Circuit Diagram |

Signal Waveform
Inspection 1. Turn the ignition switch OFF. 2. Disconnect the HO2S connector. 3. Measure resistance between the HO2S terminals 1 and 2. 4.
Removal 1. Disconnect the negative (-) battery terminal. 2. Remove the front bumper. (Refer to Body - "Front Bumper Cover") 3. Disconnect the front fog lamp connector (A). 4. Remove the front fog lamp assembly (A) after loosening the mounting nut.
Removal 1. If the compressor is marginally operable, run the engine at idle speed, and let the air conditioning work for a few minutes, then shut the engine off. 2. Disconnect the negative (-) battery terminal. 3. Remove the engine room cover.