Oxygen Sensor Heater Resistance

NOTE: Bank No. 1 refers to bank that includes cylinder No. 1. Bank No. 2 refers to bank without cylinder No. 1. Sensor No. 1 refers to sensor closest to engine block. Sensor No. 2 refers to sensor furthest away from engine block.

On ES300 (except California emission vehicles) bank No. 1 sensor No. 2, is located under driver's seat carpet, next to center counsel. On GS300 and SC300 bank No. 2 sensor No. 2 connector is located under left front passenger seat carpet. On LS400 bank No. 1 and 2 sensor No. 1 connector is located under rear air ducts. On GS400 and SC400, bank No. 1 and 2 sensor No. 2 connector is located under carpet. On all oxygen sensors, disconnect oxygen sensor connector. Measure resistance between terminals +B (No. 2) and HT (No. 1) of oxygen sensor connector. See Figure. Replace oxygen sensor if resistance is not 11.0-16.0 ohms.