How can I diagnose and fix a sudden loss of power in my Audi 80?

Recently, whenever I accelerate in my Audi 80, the car experiences a sudden loss of power and the engine seems to struggle. The check engine light also comes on intermittently. What could be causing this issue and how can I solve it?

This could be due to a faulty oxygen sensor. Check the sensor for any damage and replace it if necessary. Also, make sure the sensor is properly connected. You can also try resetting the engine control unit to see if it helps.

It is possible that the fuel pump is failing and not providing enough pressure to the engine. Have a mechanic check the fuel pressure and replace the pump if needed.