July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

A/F Sensor Heater Resistance Inspection

Disconnect the A/F sensor connector.
Measure the resistance between A/F sensor terminals A and E.
- If not within the specification, replace the A/F sensor.
A/F sensor heater resistance

1-10 ohms

Fig 1: Identifying A/F Sensor Heater Connector Terminals
Courtesy of MAZDA MOTORS CORP.