Resistance Inspection: Notes

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 negative battery cable.
Disconnect the HO2S connector.
Measure the resistance between the HO2S terminals C and D using an ohmmeter.
- If the HO2S heater is okay, but the PID value is out of specification, perform the "Circuit Open/Short Inspection".
- If not as specified, replace the HO2S. (See EXHAUST SYSTEM REMOVAL/INSTALLATION .)
Fig 1: HO2S Connector Terminal Identification (All Connectors)
Courtesy of MAZDA MOTORS CORP.