Code p0420

Hello, with a P0420 - this requires diagnostic testing to be performed. Bank one catalyst is showing inefficient. This can be due to an exhaust leak before the catalytic converter, a faulty oxygen sensor for wiring (have they ever been replaced? If so, with original Lincoln parts?), or a catalytic converter problem. The "smoke" and "hesitation" concerns me as these are likely not directly related to that code. Instead, they could be causing further damage to related parts such as the catalytic converter. Often times the cat or cats will fail due to excessively high temperatures, as occurs when fuel is dumped into the exhaust excessively, such as with an engine misfire from ignition components or open fuel injectors. Ultimately, you'll want to get help from a technician near you who can really evaluate the concern and provide advice. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.