EHC 74 is a code for the compressor, usually when it's running too slow, that's why it says "pressure remains constant"

The module is looking for the compressor to test ok in a certain time frame, over time, the seal on the pump weakens.

If you still have that fault I would buy a compressor seal rebuild kit off eBay (search for "wabco compressor rebuild"), and install it. It comes with a new seal and will run you 50 bucks.

There is a deviation built into the computer which will throw a soft fault if you are off on your ride heights by more than 3/8 from offset corners (aka opposite sides or opposite axles). If your ride heights are ok you shouldn't be worrying, even if they are 15mm higher than stock.

Did you clear the faults in the module when you scanned it? The faults won't clear unless you do it yourself, so those could be previous errors.

I would reset the faults, see what comes back. If the EHC 74 comes back repair the compressor, and re calibrate the heights using your function of choice (you can run the zero point function or re calibration routine)

Let us know

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