Self level susp. Inact.

[LinedDoor]

Last week I got self level suspension inact error. I have 2004 x5 3.0d 160kw. Scanned the car, got right height level sensor error. I have rear air suspension, left level sensor is replaced and both airbags replaced with arnotts. Also checked fuses, theyre ok. I replaced rear right level sensor and the error didnt go away, last time I changed left sensor it dissapeared with driving. Also sometimes compressor pumps either left or right air bag too high.

Now things get interesting, if I turn headlights on before turning ignition on, then my car wont show the error code, even with scanners. But if I turn the lights on after turning ignition on then the error appears and even in scanner. The error appears even if I dont turn headlights on at all.

Is there a chance that also right front level sensor might be faulty even tough I have only rear air suspension. Or does the front right level sensor show different error?