Middle HO2S Heater Resistance Inspection
WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the middle HO2S connector.
- Measure the middle HO2S resistance between terminals C and D.
- If not within the specification, replace the middle HO2S.
Courtesy of MAZDA MOTORS CORP.
- Middle HO2S heater resistance 2-50 ohms