Engine Petrol Engines
Heated Oxygen Sensors (HO2S)
• Heated oxygen sensors are installed on the front and back of the TWC (Three-Way
Catalyst).
• The front HO2S is a wide-range air/fuel ratio sensor, which can linearly detect the
oxygen concentration in the exhaust gas in all ranges, from lean to rich (air/fuel mixture).
• The rear HO2S detects the oxygen concentration in the exhaust gas behind the TWC.
• Integral heating elements allow stable detection of the oxygen concentration even when
the exhaust gas temperature is low.
M6FL_01020
A 2WD B 4WD
1 Exhaust manifold 3 HO2S (rear)
2 HO2S (front) 4 TWC
Service Training Mazda6 Facelift 01-23
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