Guided Fault Finding

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Porsche Cayenne, 2017 Porsche Cayenne, 2016 Porsche Cayenne, 2015 Porsche Cayenne, and 2014 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Component arrangement - air suspension → 4300IN COMPONENT ARRANGEMENT - AIR SUSPENSION

Symptom	Fault detection	Possible causes	Solution
Gradual loss of pressure Vehicle lying to one side after a long time Longer than average regulating times No reaction to driver's request	Observe vehicle height over a long period of time and try to find the leak using commercially available leak detection spray	Leak in air-spring strut/air spring	Replace air-spring strut/air spring → 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) → 432519 REMOVING AND INSTALLING REAR SPRING STRUT (AIR SPRINGS) or carry out repairs
		Leak in air lines or valve unit	Check tightening torques for air line connections, check insertion depth of air lines (color marking), replace air line

Symptom	Fault detection	Possible causes	Solution
Vehicle lying to one side No leaks in the system	Carry out Guided Fault Finding using the Porsche System Tester	Vehicle level sensor faulty	Replace vehicle level sensor → 431855 REPLACING FRONT LEVEL SENSOR → 431955 REPLACING REAR LEVEL SENSOR
Vehicle lying to one side No leaks in the system		Linkage or holder for vehicle level sensor is bent

Symptom	Fault detection	Possible causes	Solution
Vehicle is too high Vehicle cannot be lowered	1.) Check that the vehicle has sufficient ground clearance	Vehicle position is raised	Look for signs of damage and check clearance around the air-spring struts/air springs and anti-roll bars
	2.) Check air line and line routing	Air line blocked, kinked or frozen Air line on front axle not inserted far enough (fault code 284)	Replace kinked air lines; carefully blow out frozen and blocked air lines using compressed air Insert air line on front axle as far as it will go; only one marking should be visible.
	3.) Levelling system: Upper/lower limit value exceeded	Compressor fuse faulty Air line on front axle not inserted far enough (fault code 284)	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM Insert air line on front axle as far as it will go; only one marking should be visible.
	4.) Carry out Guided Fault Finding using the Porsche System Tester	Check relays, plug contacts, wire harness and fuses in the vehicle electrical system Drain valve in the compressor faulty/leaking/open	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM
		Drain valve in compressor or control valves in valve block do not work Valve unit does not work	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM
	5.) Valve unit blocked	Dirt in valve unit	Replace valve unit → 430419 REMOVING AND INSTALLING VALVE BLOCK
	6.) Compressor/valve block blocked	Dirt in compressor/valve block	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM
	7.) If no faults were found after carrying out Step 6.), the compressor is faulty	Compressor faulty	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM

Symptom	Fault detection	Possible causes	Solution
Vehicle is too low Vehicle cannot be raised or can only be raised very slowly	1.) Check air line and line routing	Air line blocked, kinked or frozen	Replace kinked air lines; carefully blow out frozen and blocked air lines using compressed air
	2.) Valve unit blocked	Dirt in valve unit	Replace valve unit → 430419 REMOVING AND INSTALLING VALVE BLOCK
	3.) Compressor/valve block blocked	Dirt in compressor/valve block	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM
	4.) Carry out Guided Fault Finding using the Porsche System Tester	Check relays, plug contacts, wire harness and fuses in the vehicle electrical system Drain valve in the compressor faulty/leaking/open	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM
		Drain valve in compressor or control valves in valve block do not work	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM
	5.) If no faults were found after carrying out Step 4.), the compressor is faulty	Compressor faulty	Replace compressor → 431519 REMOVING AND INSTALLING COMPRESSOR FOR LEVELLING SYSTEM

Symptom	Fault detection	Possible causes	Solution
Rapid loss of pressure	Vehicle lying to the left or right; when you try to switch to a different level, you can hear air coming from the faulty air spring	Air-spring strut/air spring is faulty	Replace air-spring strut/air spring → 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) → 432519 REMOVING AND INSTALLING REAR SPRING STRUT (AIR SPRINGS) or carry out repairs → 4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM
Rapid loss of pressure		Air line torn off	Replace air line → 4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM

Symptom	Fault detection	Possible causes	Solution
Insufficient damping	Test drive: Adjust the damping level while the vehicle is in motion. You should feel a significant change in the damping effect when driving on uneven road surfaces. Also listen for "rumbling noises"	Damping adjustment valve faulty	Replace air-spring strut → 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) or replace rear shock absorber → 432537 DISASSEMBLING AND ASSEMBLING REAR SPRING STRUT (AIR)
Insufficient damping		Vibration damper worn	Replace air-spring strut → 433019 REMOVING AND INSTALLING FRONT SPRING STRUT (AIR SPRINGS) ; clean air line system or replace rear shock absorber → 432537 DISASSEMBLING AND ASSEMBLING REAR SPRING STRUT (AIR)
Error message "PASM failure" with significant inward/outward spring motion. The error message is gone after switching the ignition off and on again.	Fault code 322, 323, 324 or 325 stored in the fault memory.	Front level sensor holder bent.	Replace front level sensor → 431855 REPLACING FRONT LEVEL SENSOR .