S4Turbo67

Hello

I have a yellow suspension light on the wife's Audi Q7.

The following fault is present:

01772 - signal from level control pressure sensor (g291) 009 - open or short to ground

I get the 008 and leak detected fault when over working the compressor to try and find the fault.
But theses disappears when dtc's are cleared but the 009 fault remains.

All wiring harnesses seem to be in good condition.
The suspension work fine and I can select all levels. When the compressor is on and the level is adjusting the yellow light disappears but comes back on a few seconds after the adjustment.
I have fitted the piston repair kit and performed a level calibration but still have a fault. There are no leaks on the valve block.
When leaving the car in lift and jack mode overnight there is no drop in the suspension.

I believe there maybe an issue with the rear shock/airbag as the height of the left rear is 15mm lower than the rear right. the default height should be 465mm but the rear left is 451mm.
Would this cause the yellow suspension warning light to stay on? Do you think there is a leak on this corner?

Anyone had a similar problem? Please help?

dreadlocks

Your level sensor is faulty, its attached to the lower control arm.. real easy to get too, its likely the rear right.

S4Turbo67

Thanks for the advice.

Can I swap both rear level sensors over to see if I get the same problem on the other side?

In measuring blockers the rear left is -10mm and rear right is 2mm out.

dreadlocks

hard to say, dunno where the calibration is stored.. but it'd be worth a shot I suppose.

S4Turbo67

Hello I managed to remove the connectors to rear sensors, cleaned and put back on.

Could not get the rear left sensor of as the nut was rusted and everything was spinning. Going to get it up on ramps and see if i can do from underneath.

When I ran the vcds scan got the fault for rear right sensor as the connector was removed but nothing flagged up for rear left sensor.
Cleared the faults in level module 34 but still got the 009 fault.

I've got the part number now so wasn't a complete waste of time.
When I cycle through the height levels all sensors go up and down in measuring block 4?
Just to confirm If the sensor was faulty would the block give no reading at all? Do you still think it is the rear level sensor?

The connector on the rear left sensor was on solid took some shifting to get it off.

S4Turbo67

Sorry forgot to mention.

The lower for loading option in mmi is grey out in set up. This function can not be selected.

The adaption is set to default level. When I calibrate the suspension and store and save new values all corners are within 1mm.
However, when I turn the engine off and come back to the vehicle the adaption resets to default values.449 front and 465 rear.

Any idea please?