Air suspension fault

[matt_ali_walsh]

Dear brains trust,<br>My D3 has been showing an intermittent suspension fault. I suspected the filter/dryer, so replaced the dessicant and exhaust solenoid. Two days later the fault has reappeared (see photo). Where should I check next?
Cheers,
Matt

[BradC]

Where should I check next?

The "Delivery valve". It's under the large nut on the head and is the non-return valve on the discharge side of the compressor.

[Grasshoppr]

See the post further up the page on a 2008 d3 compressor problem.
It gives you a few ideas