Touareg V8-4.2L (BHX) (2004)
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A 2-3 mm drop in suspension height overnight is normal.
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A 5 mm or greater drop in suspension height indicates a leak at that particular corner of vehicle.
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Check lines from the air spring damper to the valve block for leaks.
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Wiggle lines, as they often need a dynamic situation to show problems.
Tip:
There are no check valves in each individual air spring damper and the line is pressurized from valve block to each air spring damper.
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If more than one corner of vehicle drops in excess of 5 mm, leak is most likely in the valve block.
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Replace valve block.
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Repair any lines kinked or leaking.
Accumulator and line, leak test
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Lines to air spring dampers were previously verified.
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Follow blue lines from compressor to accumulators to check for leaks.
These lines are not easy to access:
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Rear seat and carpet have to be removed or peeled back to get to blue lines in some places.
Tip:
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One difficult leak to find is a poor line seating condition at rear accumulator
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Wiggle lines to determine if it leaks only in a dynamic situation.
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Repair any lines kinked or leaking.
Compressor insufficiency
If above DTC returns after actions above have been completed: