I have a 2003 Saab 93 , Model Linear. I am unable to pass the State of Maryland emission test. I have changed all the parts, which concern the emission but the check engine light remains and I fail the test over an over.
I have changed the secondary air injection pump,
the vacuum pump,
the mass air flow sensor ; oxygen sensor (front),
the coolant temperature sensor, and the secondary air injection check valve.
I believe there is something else needs to be done to get the system working I trust your expert knowledge on cars will guide me solving this challenging problem.