Get a second hand ecu and solder the map sensor out and into yours.
Replace the ecu completely, but then you need to code the immobilizer.
Check with bba-reman if they can repair your ecu.
Those are your options, sensor is not sold by Bosch.

But before doing that check the hose going to your ecu for cracks/leaks/contamination.
Also check INSIDE the ecu, there's a very short hose here.

Could you post the trouble codes that were read?