Close

Q: catalytic converter on 2003 Subaru Baja

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My car has an aftermarket exhaust system. I am told that the computer says that it is not ready for testing because I only have one catalytic converter instead of the two that came stock. Do I need the two in order to pass a PA emissions test, or is there something else wrong with the car?
(2) Answers
This is kind of a complicated one. Before you modified your emission system, it had been tweaked and tuned by Subaru to work with your engine computer to produce a very specific emissions result, so that you could pass a state emissions test. Altering the emission system will push you outside of that spec, and you will likely not pass a state emission test because of the change--but it totally depends on the state emissions test and how strict it is.

In California, you would almost certainly not pass. Maybe in Pennsylvania. Is your check engine light on? Did your upgrade come with some changes to your engine computer?
Didn't find what you were looking for?