Fuel and ignition system 9112 · Voltage characteristics of oxygen sensor 2445 Hot film air mass

Fuel and ignition system 9112 Voltage characteristics of oxygen sensor 2445 Hot film air mass flow sensor (HFM 5) The modified hot film air mass flow sensor HFM 5 is used, as was already fitted to the Boxster in model year 2000. With the C-shaped air duct, this air mass flow sensor is more resistant to contamina- tion and water droplets, as these can only reach the sensor element after deflexion. A cross bore through the air duct reduces pulsation faults. Note: This air mass flow sensor must not be fitted in pre 2002 996 models, as the data rec- ords of the control unit are adapted to the corresponding air mass flow sensor. 2_12_02 Us – voltage of oxygen sensor ? – air/fuel ratio a – rich mixture (air deficiency) b – lean mixture (excess air) 2_13_02 A – Sensor element B – Cross bore C – C-shaped air duct 2 - 10 Service Information 2002