DTC C1A11-64: Pressure Increases When System Inactive - Signal plausibility failure: Action

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

Check for an air spring leak. Check the air harness for evidence of melting, crushing, kinking or collapsing. Repair/renew as required, clear DTC and retest
If fault persists, check the reservoir pipes and the front and rear valve block pipes for correct routing and installation. Repair/renew as required, clear DTC and retest
Refer to the approved diagnostic system for corner, reservoir and exhaust valve checks. Check the corner valve for leaks. Repair/renew as required, clear DTC and retest
Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check air suspension air pressure sensor circuit for short circuit to ground, short circuit to power, short circuit to another circuit, open circuit, high resistance. Repair circuit as required, clear DTC and retest
If fault persists, check and install new air suspension air pressure sensor as required