Rear HO2S Heater Resistance Inspection
WARNING: This page is about a different car, the 2005 Mazda RX-8 and 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the rear HO2S connector.
- Measure the resistance between rear HO2S terminals C and D.
- If not within the specification, replace the rear HO2S. (See REAR HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION .)
Rear HO2S heater resistance
- 14.1-18.9 ohms [20 °C {68 °F}]