Mazda RX-8 Manual page 546

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}]
o
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)
Open circuit
(w) Engine Specifications
Page 309