Air/Fuel (A/F) 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 which includes cylinder No. 1. Bank No. 2 refers to bank without cylinder No. 1. A/F sensor refers to sensor No. 1 in exhaust manifold/pipe in front of catalytic converter.
Disconnect A/F sensor connector to be tested. Measure resistance between terminals B+ and HT of A/F sensor connector. See Fig 1. Resistance should be .8-1.4 ohms at 68°F (20°C) or 1.8-3.2 ohms at 1472°F (800°C). Replace A/F sensor if resistance is not as specified.