I have a 2006 auto WRX, 59K miles. I was told I need to replace my air pump and air injection valves. The error codes are P0410, P1410, P2431, P2433. Cost for parts is $1000, labor is $600. I read on the internet that the air pump is not required for the car to run, its used for passing smog tests. Can I forgo this repair?