P0173 - Mass airflow sensor

Question

After the mass airflow sensor has been replaced, does the O2 sensors have to be replaced a well. Check engine light is still on, won't pass emissions.

Answer 1

P0173 Fuel trim malfucntion Bank 2

This year make and model it would help. but may not resolve any issue, How the sparkplugs.

The sparkplug condition should be check for any worn condition , this would also help to lower the emission for your emission test.