DTC P012B-21: Turbocharger/Supercharger Inlet Pressure Sensor Circuit Range/Performance - Signal amplitude < minimum: Action

Refer to the appropriate system wiring diagrams and check manifold absolute pressure sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance

Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
Using the Jaguar Land Rover approved diagnostic equipment, check throttle position voltage at ignition on
Check intake manifold for leakage, loose or missing components
Check air filter for blockage or restriction
Check engine breather system for leakage
Check throttle blade for carbon obstruction
Check and install new manifold absolute pressure sensor as required
Check catalytic converter for damage
Check exhaust system for blockage
Clear the DTCs and retest