HO2S Heater Resistance Inspection
WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the HO2S connector.
- Measure the resistance between the HO2S terminals C and D.
- If not as specified, replace the HO2S.
- If the HO2S heater is okay, but PID value is out of specification, perform the CIRCUIT OPEN/SHORT INSPECTION (HEATER) .
Specification
Front: 3.0-3.6 ohms
Rear: 5-7 ohms