Dodge Durango 2004 Moteur 5.7 P0300 and P0157

Question

h,i i got preston on my air filter not much and now a code po 300 i thing i my intake gasket is the probleme ,what do you thing about that? tank you.

Answer 1

P0300 Random misfire

P0157 02 sensor circuit low voltage Bank 2 Sensor 2

A intake vacuum leak ,usually result in a higher idle and a lean Bank code condition. , Depending on where the leak is  at  on the intake it at it can cause a random misfire. Use brake cleaner or carburator cleaner and spray at the suspected area , It would make a noticable drop in the RPM.