A/F Sensor Heater Inspection
WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
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 cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
- Disconnect the A/F sensor connector.
- Measure the resistance between A/F sensor terminals A and E.
- 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]