Mazda 2: Heated Oxygen Sensor (HO2S)
HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION
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.
1. Disconnect the negative battery cable.
2. Remove the air cleaner cover. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).
3. Disconnect the HO2S connector.
4. Remove the HO2S using the SST.

5. Install in the reverse order of removal.
HEATED OXYGEN SENSOR (HO2S) INSPECTION
HO2S Inspection
1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following:
- Vehicle speed (PID: VSS)
- Engine speed (PID: RPM)
- HO2S voltage (PID: O2S12)
3. Drive the vehicle and decelerate the engine speed by releasing the
accelerator pedal fully
when the engine speed is 3,000 rpm or more.
4. Verify that the HO2S outputs a voltage of 0.6 V or more, one time or more,
then verify
that the HO2S voltage (PID: O2S12) is 0.3 V or less while decelerating as shown
in the
figure.

- If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S)
REMOVAL/INSTALLATION).
HO2S Heater Inspection
1. Disconnect the HO2S connector.
2. Measure the HO2S resistance between terminals C and D.

- If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S)
REMOVAL/INSTALLATION).
HO2S heater resistance
READ NEXT:
CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION
CAUTION:
When replacing the CKP sensor, make sure there is no foreign material on
it such as
metal shavings. If it is installed with foreign
CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION
CAUTION:
When replacing the CMP sensor, make sure there is no foreign material on
it such as
metal shavings. If it is installed with foreign ma
KNOCK SENSOR (KS) REMOVAL/INSTALLATION
1. Disconnect the negative battery cable.
2. Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).
3. Disconnect the KS connector.
4. Remo
SEE MORE:
Manual Transaxle Shift Pattern
The vehicle is equipped with either a
5-speed or 6-speed manual transaxle. The
shift pattern for each is shown above.
Depress the clutch pedal all the way down
while shifting; then release it slowly.
Your vehicle is equipped with a device to
prevent shif
Power/Volume/Sound Controls
Clock
Operating the Radio (Type A)
Operating the Radio (Type B)
Operating the Compact Disc (CD) Player
How to use Auxiliary jack/USB port
Error Indications
Power/Volume/Sound Controls
The figure is an example showing the type A unit.
Power ON/O
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