A/F Sensor Heater Inspection

1. Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION .)
2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION .)
3. Disconnect the A/F sensor connector.
4. Measure the resistance between A/F sensor terminals 2B and 2D.

Courtesy of MAZDA MOTORS CORP.

• If not as specified, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION .)

A/F sensor heater resistance 

1-10 ohms [normal temperature]