dmico2

Recently replaced the front left air strut but would occasionally get Visit Workshop light with the arrow pointing up, not the fatal red failure. Yesterday the back of the car was lowered and running the codes I received:

5501
5503
5507
5508

Not seeing any leaks with the old spray bottle test on the lines, compressor is kicking on but I'm suspecting it's not running full strength. Rear right strut feels firm while rear left is mushy.

Any suggestions on what the codes may be pointing towards?

Onyxthecat

The bag itself is leaking or there is a crack in the line somewhere.

Plutoe

Take that Snapon tool and throw in a river and invest in XDOS

Chest Rockwell

Agreed with Pluto. Fill out your profile to let nearby users know approximately where you live. I have access to aa Sta/xEntry for troubleshooting my pair of Mercedes and it has become an invaluable tool.