DTC C1124-29: Height Sensor(s) - Signal invalid: Action

NOTE: If any height sensor fixings were slackened or found to be loose or if a height sensor was changed, the vehicle ride height MUST be re-calibrated

Inspect height sensor(s) for damage or loose fixings. Confirm that the correct height sensor part number is installed, as specified in the service parts database
Inspect height sensor brackets for damage or loose fixings. Repair as necessary
Inspect height sensor electrical connector(s) disconnect electrical connector to height sensor(s) and inspect connector pins and terminals for evidence of corrosion or water ingress. Repair as necessary, clear the DTC and retest
If the fault persists, install a new height sensor as necessary