A/F Sensor Heater Inspection: Notes

WARNING:

A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system.

CAUTION:

Do not allow flammable objects such as the taping for bundling a wiring harness to come into contact with the exhaust manifold and silencer.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Disconnect the A/F sensor connector. (See Air Fuel Ratio (A/F) Sensor Removal/Installation .)
Measure the resistance between A/F sensor terminals A and E.

Fig 1: Measuring Resistance Between A/F Sensor Terminals A And E And Connector End View
Courtesy of MAZDA MOTORS CORP.
- If not as specified, replace the A/F sensor. (See Air Fuel Ratio (A/F) Sensor Removal/Installation .)