can a missing nut and a loose nut on the exhaust manifold cause a p0430?

Question

I am missing a nut and another nut is loose on the rear exhaust manifold. Can that cause the check engine light to come on and read a p0430 code?

Answer 1

P0430 Catalytic below threshold Bank 2

Minor exhaust manifold leak, can but the exhaust leak has to be close to the catalytic convertor,