Dodge Durango Catalytic Converter

Replace both when diagnosis finds both failed or the required assembly includes both. A sound separately serviceable unit can remain. Individual 5.7L front-side options make a one-side repair possible when the other side does not need replacement.

The engine, failed position and replacement package affect the parts price and installation work. Rusted connections or damaged sensors add labor. Compare estimates for the same units and include any pipe that cannot be reused.

It can be worthwhile when the engine and the rest of the SUV are sound. An unresolved misfire or oil-burning problem needs repair alongside the failed catalyst. Correcting that cause protects the replacement from the same damage and makes the repair more likely to last.

Yes. A catalyst can lose treatment effectiveness while exhaust still flows through it. A restriction and an efficiency failure need different diagnosis. A code alone does not prove that replacing the converter will correct a separate power-loss problem.