Welcome to NZ Autospares.
Part numbers
Audi: 4Z7616007, 4Z7 616 007
Audi: 4Z7616007A, 4Z7 616 007 A
WABCO: 4154031060
Fits the following
for Audi A6 (4B C5) 1997-2005
for Audi A6 Allraod (4FH C6) 2006-2011
for Audi A6 Allroad 2012-2016
The electronic air compressor installation instructions
The Air Compressor Installation and Operation Instructions
1. When the air compressor being replaced, the matching relay must be replaced according to the corresponding vehicle. If there is something wrong with the relay which leads the compressor to continuous operation without any break, it will burn out the electric motor or other plastic part.In severe cases, it can cause fire and cracking of the dryer.
2. When the air compressor being installed, the critical parts such as rubber shock pad and damping spring must be fully fixed on the stand without short installation or missing installation (The air compressor is unequipped with parts).With the anti-vibration parts of short installation or missing installation, a loud noisy instance will happen when the air compressor is working for the sake of resonance. Aging of the rubber cushion will cause the suspension failure and produce a metal collision sound.
3. Distribution valve, shock absorber, air tank and tube connector must be checked after air compressor installed to ensure air-tightness. The lifespan of the air compressor will be shortened if the leakage exists
What are the common air suspension issues in an Audi A6?
The most common Audi A6 AllRoad Air suspension issues are:
- Corner Sagging
- Suspension leaning to one side
How does Audi A6 AllRoad Adaptive suspension work?
The Allroad adaptive suspension was first introduced in 1999 in the A6 Avant as a variant called the A6 AllRoad Quattro. It is now available in the A4 and A6 Allroad Quattro Wagon models, namely the A4 Avant and the A6 Avant.
Main Issues
Corner Sagging
Root Cause:
- There are 3 potential reasons for ride height loss on parking:
- Faulty Ride height sensor
- Air Spring Leakages
- Valve-Block Defect
- Faulty Air Compressor
- Shock Absorber Leakage
- Air leakage related suspension sagging generally is seen when the car is parked overnight and sometimes even over a period of days.
- This fault can be confirmed using the VCDS Scanning/Diagnosis tool
- Before starting the scan clear all Fault codes that have already been stored
- Start the vehicle and try to lift the vehicle by selecting “Lift” option
- Corner suspension loses ride height after parking
- In some cases, both sides (left and right) have lost height
Troubleshooting A6 Corner Sagging: Compressor Failure
- If the compressor ‘humming’ sound can be heard, and the suspension is not able to lift, it could be a case of a failed compressor
- The Air Compressor tends to corrode over long-term use and internally wears out. Even if the compressor runs, it fails to develop the required pressure.
Troubleshooting A6 Corner Sagging: Ride Height Sensor Linkage
- You need to Scan the Fault codes with the Ignition ON
- Error codes like “Level Control system sensor : Mechanical malfunction” point to the ride height sensor linkage as a probable issue.
- The faulty linkages need to be corrected or replaced.
- Once the linkages have been rectified the “Air susp.: Wheel change” needs to be changed back to OFF
- Visually inspect if there is a difference in height between the left and right side in the front and the back
- Any difference in height can be corrected by doing a height calibration
Troubleshooting A6 Corner Sagging: Air Spring Leakage
- If the Ride height sensor linkages were not the issue, the next most probable cause would be an air leakage somewhere in the air suspension air circuit.
- In the case of air leakages, the system does often detect and display the error code.
- But, however, there have been many cases where confirmed leakages were not detected by Diagnostics.
- Air springs are known to wear out and crack at the rubber bellow surface gradually after accumulating mileage. They generally would last 70 to 80Kms depending on usage.
- In a high mileage vehicle, the air springs would be the first place to check for leakages.
- Fill the Air springs by either
- Turning ON the ignition, or
- In the Diagnostic tool, use the “Air Filling/Venting Set-up” Inspection/Test to fill air into the system, OR
- If the diagnostic method is not possible, then you can pressurize the air spring through the inlet using an external air compressor
- Once the air springs are inflated, you need to spray springs with soap solution to check for leaking.
- After spraying the soapy water solution, wait to see if there are white foam bubbles that stay at one spot even after wiping it with a finger.
- In cases where the leak is major, you even hear a hissing noise coming from the leakage point and be able to locate it by ear.
Troubleshooting A6 Corner Sagging: Valve-Block Leakage or Defect
- The DTC (Diagnostic Trouble Code) will mostly show up as : Level control system
The Valve block is in the boot near the spare wheel. Use a soapy water spray to detect bubbles at the valve block air connector fittings. If there is a crack or damage at the valve block body, then it will need to be replaced
Note: Suppose there were no cracks/damages or leakages, then you need to check whether the valve is properly sending air to the individual air struts. This can be done using the diagnostic tool
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