A/F Sensor Heater Inspection

Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI 3.7 V6] .)
Disconnect the A/F sensor connector.
Measure the resistance between A/F sensor terminals C and E.

Fig 1: Identifying A/F Sensor Connector Terminals
- If it is not within the specification, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION .)
  A/F sensor heater resistance
- 1-10 ohms