remove secondary catalytic converter?

2023 NISSAN ALTIMA
63,000 MILES • 2.5L • 4 CYL • 2WD • AUTOMATIC
Avatar
CHRISTIANMONRO
  • MEMBER
  • 4 POSTS
If I remove what I think is the secondary catalytic converter on my Altima, will it cause engine damage or check engine light? It’s after the two sensors it’s super small. I just wanna know if we’re moving that will cause any damage. i’ve already done a muffler delete and a resonated early. I know there’s two catalytic converters.
Dec 8, 2025 at 9:18 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 POSTS
Either one of these is safe to delete and will not cause engine problems, as long as there is no sensor behind the one you want to take off. I assume this is a track car correct? If not the car may not pass inspection FYI. Check out the images (below). Let us know if you need anything else.
Image (Click to enlarge)
Attached Media
Dec 9, 2025 at 11:30 AM
Advertisement