MANIFOLD GASKET CAUSES ENGINE LIGHT TO COME ON?

Question

I HAVE A 2005 DODGE DURANGO WITH AN ENGINE LIGHT ON. IT IS NOT BLINKING

Answer 1

P0420 catalytst system below efficency Bank 1

P0456 Evap purge system small leak

P0457 Loose fuel cap

P0440 General Evap system failure

Yes a manifold gasket will cause a CK ENG LT to come on , you would also have a lean code condition, What you have as for the CK ENG LT are the Evap code, What the Evap system does is prevent fuel fumes from going into the atmosphere, P0457 can set P0456 and P0440,  For the P0420 a manifold gasket leak can contribute to the catalytic from working properly