Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20133 MAZDASPEED, 2.3L ENG VIN 3REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 24 (ENGINE CONTROL SYSTEM [MZR 2.0, MZR 2.5])HEATED OXYGEN SENSOR (HO2S) INSPECTIONHO2S INSPECTION
2013 Mazda 3 Mazdaspeed, 2.3L Eng VIN 3
HO2S Inspection
2013 Mazda 3 Mazdaspeed, 2.3L Eng VIN 3SECTION HO2S Inspection
WARNING: This page is about a different variant/trim than selected.
- Connect the M-MDS to the DLC-2.
- Switch the ignition to ON.
- Warm up the engine to normal operating temperature.
- Access the following PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST
.)
- VSS (Vehicle speed)
- RPM (Engine speed)
- O2S12 (HO2S output voltage)
- Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more .
- 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 .)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.