Downstream– The downstream oxygen sensor’s (after the exhaust exits the catalytic converter) primary function is to verify the catalytic converter is doing its job.The Powertrain Control Module (PCM) uses this data to adjust the air-fuel ratio, ignition timing, and more. Upstream– The upstream (before the exhaust gas hits the catalytic converter) oxygen sensor measures the exhaust gasses as they exit the engine.Your Honda Odyssey has at least two oxygen sensors, one before and one after the catalytic converter (commonly referred to as the upstream and downstream O2 sensors). Test the Oxygen Sensors Typical Oxygen Sensor If your van doesn’t have an exhaust leak, you’ll need to test the O2 sensors and/or catalytic converter. You should be able to hear it easily when looking underneath your Odyssey.Īn exhaust leak can cause P0420 since it causes exhaust gasses to escape unmetered. It would be a good idea to check your van for an exhaust leak first. If your van has any O2 sensor-related codes, jump to section three. You should see P0128 along with this code. When this happens, the exhaust the O2 sensors see will be out of range, and it could throw P0420. If your Odyssey’s computer doesn’t know the engine temperature, it’ll keep the fuel mixture rich.
2004 honda odyssey oxygen sensor location code#
If you have a misfire-related code (such as P030X, where X is the misfiring cylinder) or P0300 (random multiple misfiring), it can cause the catalytic converter to overheat, which decreases its efficiency and throws P0420. Three types of codes can give clues as to what’s going on with your van. The first thing you want to do when trying to fix P0420 in the Odyssey is to verify there aren’t any other trouble codes. Here’s a good P0420 diagnostic order for the Honda Odyssey: 1. Before taking your Odyssey into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. The most common fix for P0420 in the Honda Odyssey is a new catalytic converter, followed by an O2 sensor replacement. 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 Honda Odyssey: 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 Honda Odyssey will often be thrown if one of your van’s oxygen sensors is not functioning correctly. The bank 2 version of this code is P0430. A quick Google search for your van’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 van 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 Odyssey’s engine with the first cylinder. You can ignore this section if your Odyssey 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.
2004 honda odyssey oxygen sensor location software#
When the readings from each O2 sensor get close, the software in your Odyssey’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 van 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 Odyssey’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 van: 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 Honda Odyssey P0420 Quick Info Table Definition 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. It covers the P0420 code’s meaning, symptoms, causes, and possible solutions. This page is meant to help you troubleshoot the Honda Odyssey P0420 trouble code.
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