MHK000210 - Oxygen Sensor – HEGO – 4.4L V8

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Heated exhaust gas oxygen (HEGO) sensor, front (pre-catalyst) position, for the 4.4L V8 petrol engine (M62 B44). The sensor sits in the exhaust upstream of the catalytic converter and measures residual oxygen in the gas leaving the cylinder head. Its signal is the primary feedback the engine control module uses to trim injector pulse width and hold the air/fuel ratio at stoichiometric. An integral heater element brings the sensing tip to operating temperature quickly after a cold start, so closed-loop fuelling is established sooner. The engine carries one front sensor per bank. A lazy or failed sensor shows as poor fuel economy, rough running, elevated emissions and a stored fuelling or sensor-heater fault code. Show more