Heated Oxygen Sensor Heater Resistance

WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Bank No. 1 refers to bank that includes cylinder No. 1. Bank No. 2 refers to bank without cylinder No. 1. Air/Fuel sensor refers to sensor closest to engine block. See AIR/FUEL (A/F) SENSOR HEATER RESISTANCE . Heated oxygen sensor refers to sensor furthest away from engine block, behind catalytic converter.

On RX300, bank No. 1 sensor connector is located under driver's seat carpet, next to center counsel. Remove driver's seat to access connector. On all models, disconnect oxygen sensor connector. Measure resistance between terminals B+ and HT at oxygen sensor connector. See Figure. Replace oxygen sensor if resistance is not 11.0-16.0 ohms at 68°F (20°C) or 23-32 ohms at 1472°F (800°C).