P0403 subaru - how do i fix it and how much will it cost?

Question

1996 subaru lagacy outback
check engine light is on
car runs great

Answer 1

Hi there,

Usually with this code you need to replace the BPT valve. This is the small green disc on top of the engine next to the egr valve. Take it off and see if there's water in it. If there is, then it needs to be replaced. With the code for the egr if the engine is running fine,this is usually the problem.