HO2S 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.
NOTE:
- If penetrant lubricating spray penetrates the airflow hole of the HO2S, it could cause interference with the HO2S function.
- When removing the HO2S, wrap a rag around the lower position so that penetrant lubricating spray does not get sprayed into the airflow hole.
- Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
- Lift up the vehicle.
- Remove the floor under cover. (With floor under cover) (See FLOOR UNDER COVER REMOVAL/INSTALLATION .)
- Disconnect the HO2S connector.
- Measure the resistance between HO2S terminals C and D.
- If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION .)
HO2S heater resistance
2-50 ohms [normal temperature]