MHK000220A - Oxygen Sensor – HEGO – 4.4L V8

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Heated exhaust gas oxygen (HEGO) sensor, rear (post-catalyst) position, for the 4.4L V8 petrol engine (M62 B44). The sensor sits in the exhaust downstream of the catalytic converte r and monitors the oxygen content of the gas leaving it. Comparing this signal against that of the front sensor lets the engine control module assess catalyst conversion efficiency and apply a slow correction to the fuelling trims. An integral heater element brings the sensing tip to operating temperature quickly after a cold start. The engine carries one rear sensor per bank. A failed sensor typically shows as a catalyst-efficiency or sensor-circuit fault code and an emissions test failure rather than a driveability complaint. Show more