Diesel Engines Engine
Heated Oxygen Sensor
• The HO2S is located behind the DPF and detects the oxygen concentration in the
exhaust gas. The HO2S is a wide range type oxygen sensor and uses the same
operating principle as the wide range oxygen sensors on petrol engines. It generates a
clear electrical signal in a wide range from λ = 0.7…∞ (∞ = air with 21 % oxygen). As a
result, the sensor is also capable of detecting the oxygen concentration in the exhaust
gas of a diesel engine, which generally works with an excess-air factor of λ ∼ 1.4 (at full
load) to λ ∼ 3.4 (at idle).
• The information of the HO2S is used for the calculation of the soot amount burnt off in
the DPF.
M6FL_01055
1 HO2S
01-70 Service Training Mazda6 Facelift
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