Resistance Inspection (HO2S Heater)

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 the wiring harness to come into contact with the exhaust system such as the exhaust manifold and silencer which reach high temperatures. Otherwise, it could cause fire damage.

1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
2. Lift up the vehicle.
3. Disconnect the HO2S connector.
4. Measure the resistance between HO2S terminals C and D.

Courtesy of MAZDA MOTORS CORP.

• If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [SKYACTIV-G 2.0] .)

  HO2S heater resistance 

  2-50 ohms