S60 2.4 2001 P2037 OBDII Error Code

[10184911]

Recently I had the problem of stalling when:
- air conditoner is on,
- braking and,
- turning.
I had the throttle body replaced, which fixed the problem of stalling. but still she did not run as smoothly as she should. Idle can be jerky at times. so I pluged it into code reader in which the reader spit out the error code "P0237 Turbo/Super Charger Boost Sensor "A" Circuit Low."
Had my turbo replaced around a year ago
Do anyone know how to fix this problem?
Thanks