Monnk13
Senior Member
- Thread starter
- #1
Hi, I have a 2019 civic si with a PRL cobra cold air intake (street maf) and a hondata CARB +6 base tune. I installed the flashpro about a week ago. Today I received check engine code(p0420) saying there was an emissions problem. How is this possible? I have a street maf and a carb exempt tune. Has anyone had this problem, or can you offer a solution to this? I cleared the code once this morning, drove the car about 40 miles and it came back on. Any help is appreciated.
Sponsored