Description

Mass Air Flow Sensor for the air intake system of the M47 Td4 2.0L four-cylinder turbo diesel.

The sensor sits in the intake tract downstream of the air filter housing and upstream of the turbocharger inlet, where it measures the mass of air drawn into the engine. The engine control module uses this signal to set fuelling quantity, boost control and exhaust gas recirculation rate.

A contaminated or drifting sensing element typically presents as reduced power, black smoke under load or an unstable idle. The element is not serviceable and the unit is replaced complete.