![]() ![]() Burning oil (overheats converter, usually no code).Overheating converter (usually caused by a misfiring engine, there should be codes).Here are the most common causes of P0420 in the Ford Escape: Likely Causes Rotten Smell– A rotten egg or sulfur smell is a telltale sign of a bad catalytic converter.Service Engine Light– Often, this is the only symptom.Here are the typical symptoms that something is wrong when you have code P0420: For most people, the first sign that anything is wrong is the service engine soon light coming on. There are rarely drivability issues associated with P0420. The P0420 code in a Ford Escape will often be thrown if one of your vehicle’s oxygen sensors is not functioning correctly. The bank 2 version of this code is P0430. A quick Google search for your vehicle’s engine and model year can quickly confirm that. Typically, the first cylinder is closer to the front of the engine. Most vehicles only have one catalytic converter But, if your vehicle has dual exhaust, you’ll need to determine which side of the engine is the bank one side.īank one is the side of your Escape’s engine with the first cylinder. You can ignore this section if your Escape has an inline engine or if the exhaust manifolds merge into one pipe before the catalytic converter. The O2 sensors are not reporting the right readings from the exhaust.The catalytic converter is losing efficiency and needs to be replaced.The exhaust is escaping before it is measured.When the readings from each O2 sensor get close, the software in your Escape’s PCM believes that the catalytic converter is no longer doing its job. These readings shouldn’t match since the catalytic converter is supposed to scrub the pollutants from the exhaust. When the readings from the upstream and downstream oxygen sensors show similar readings (not enough pollutants expelled from the exhaust), your vehicle will throw the service engine soon light (P0420). Efficiency Below Threshold An upstream O2 sensor Catalyst system efficiency is the percentage of these chemicals removed from the exhaust system. Your Escape’s exhaust contains hydrocarbons, carbon monoxide, and other harmful gasses. P0420: Catalyst System Efficiency Below Threshold (Bank 1) Catalyst System Efficiency Here’s the technical definition for your vehicle: P0420 is generic (has the same meaning for all vehicles made in 1996+) OBDII trouble code. O2 sensor replacement is easy, but the catalytic converter can be a challenge P0420: Catalyst System Efficiency Below Threshold P0420 is the most common OBDII code and is virtually never a breakdown risk.Ī failing oxygen sensor or bad catalytic converter are the most common causes of P0420.įord Escape P0420 Quick Info Table Definition It covers the P0420 code’s meaning, symptoms, causes, and possible solutions. This page is meant to help you troubleshoot the Ford Escape P0420 trouble code. ![]()
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