Air Flow Meter/Sensor: Service and Repair

Removing And Installing Air Flow Sensor

Information












Removing air flow sensor - Cayenne S (type M48/00)
1. Remove left and right engine compartment cover.
2. Separate electric connections on the air flow sensor.







3. Disconnect the air flow sensor connections. To do this, undo the hose clamps to the left and right on the bellows and pull the bellows off the air flow sensors.







4. Pull out retaining clip on the air flow sensor. Clamp for hot-film mass air flow meter







5. Pull out air flow sensor.

Installing air flow sensor - Cayenne S (type M48/00)
1. Insert air flow sensor in the pipe on the air cleaner housing cover. When doing so, observe the flow direction. There is a small arrow on the housing which must point towards the engine. Then connect the retaining clip.







2. Connect the bellows and tighten the hose clamps.







3. Connect electric connector to the air flow sensor.







4. Fit engine compartment cover.

Removing air flow sensor - Cayenne Turbo (type M48/50)
1. Remove engine compartment cover at the front.
2. Disconnect the relevant connection on the air cleaner cover. To do this, turn the pins through 180 degrees and pull them out. Then pull off the intake manifolds.







NOTE: Items 3 to 5 must only be carried out on the right-hand air flow sensor.

3. Remove the air tube on the right air cleaner cover. To do this, unclip the green cap. Insert a screwdriver into the notch of the cap and lever the cap off.







4. Push the snap ring into the flange -1- and then pull it off together with the flange -2-.







5. Clip the green cap on again after disassembly.







6. The coolant bleeder hose on the coolant expansion tank should be unclipped from the air cleaner housing cover of the cylinder bank 1 - 4.







7. Remove the relevant air cleaner cover. To do so, loosen the two fastening clips on the top side and remove the cover from the engine compartment in an upward direction.







8. Disconnect the electrical plug of the air flow sensor.
9. Loosen the hose clamp on the bottom of the air flow sensor and remove the component from the engine compartment.







10. Then undo the two fastening screws and remove the flange.







Installing air flow sensor - Cayenne Turbo (type M48/50)
1. Place the air flow sensor on the flange of the air cleaner and tighten the two fastening screws.







2. Insert the air flow sensor in the connection for the turbocharger and tighten the hose clamp. Connect the electrical plug to the air flow sensor.







3. Place the cover on the air cleaner housing and run in from top to bottom. Make sure that the three mounting elements run into the mounting points on the underside. The figure gives a clearer view of the dismantled air cleaner housing.







4. Push cover up against the air cleaner housing and release the two fastening clips.







5. The coolant bleeder hose and the coolant overflow hose must be clipped back onto the cylinder bank 1 - 4 on the air cleaner housing.







6. Push the air suspension line onto the right air cleaner cover.







7. Push the connections onto the cover of the air cleaner housing and mount and lock the fastening pins.







8. Fit engine compartment cover.