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A catalytic converter has within its shell a fine honeycomb type clay “brick” with thousands of tiny “tunnels” tightly arranged so that the exhaust gas must pass through them as it exits the engine. The catalysts on today’s vehicles are “Three Way Catalysts,” meaning that they process three harmful gasses, namely NOx (Oxides of Nitrogen), CO (Carbon Monoxide), and HC (Hydrocarbons, which is unburned fuel).Ī “catalyst,” by definition, foments changes in other elements without changing itself – the other elements in this case are the three harmful exhaust gasses. ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information. Repair manuals, such as those from Chilton, are useful, but an ALLDATA subscription is even better. When troubleshooting and repairing diagnostic trouble codes, you should consult the factory repair information for your application.
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You’ll need to diagnose the code accurately, then perform any necessary repairs.Īlso, keep in mind that all vehicles are different. There isn’t a “magic bullet” fix for the issue. The code could be triggered by anything from a bad catalytic converter to a faulty oxygen sensor, so you must do your homework. Usually the catalyst needs to be replaced, and bolt-on catalysts are available for most vehicles. You’ll need to diagnose the code accurately, as outlined above, then perform any necessary repairs. Therefore, there isn’t a “magic bullet” fix for the issue.
There are multiple reasons why code P0420 might be stored.
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For an idea of how to troubleshoot the code, check out the videos below: There are numerous potential causes for OBD-II code P0420. But if the case is the latter, it can lead to engine performance problems, such as a lack of power, rough idling, and stalling, which are some of the common signs of a clogged catalytic converter. P0420 typically means that a converter has worn out or degraded-not obstructed or clogged. You may notice the following symptoms if you drive a vehicle with a P0420 trouble code: What are the Common Symptoms of the P0420 Code? Damaged wiring and loose connections are possible causes of the P0420 code.Ĭontaminants like coolant and engine oil can also damage the cat. These include engine performance issues, such as a misfire or improper air/fuel ratio, which can cause the converter to overheat. The catalytic converter can also fail due to a number of other problems.
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Computer issues (e.g., software in need of an update) (not very common).Circuit problems, such as damaged wiring and loose connections (not very common).A faulty oxygen sensor (not very common).A failed catalytic converter (very common).Issues that can cause this OBD-II code include: What are the Possible Causes of the P0420 Code?Ī faulty catalytic converter is the most frequent cause of a P0420 trouble code. The opposite side of the engine is Bank 2.
The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter.īank 1 refers to the side of the engine that houses the number one cylinder. What Does the P0420 Code Mean?Ĭode P0420 stands for “Catalyst System Efficiency Below Threshold (Bank 1).” Put simply, this code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter.
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However, if you use an OBD-II scanner and get a P0420 code, you may be having issues with your catalytic converter.įor a full rundown of what this code entails, read on. There are many issues that could trigger the Check Engine Light to illuminate.