{"id":643,"date":"2024-02-11T16:01:33","date_gmt":"2024-02-11T16:01:33","guid":{"rendered":"https:\/\/jeepadvices.com\/how-to-troubleshoot-fix-p0420-jeep-dtc-code-ultimate-guide\/"},"modified":"2024-02-15T08:25:35","modified_gmt":"2024-02-15T08:25:35","slug":"how-to-troubleshoot-fix-p0420-jeep-dtc-code-ultimate-guide","status":"publish","type":"post","link":"https:\/\/jeepadvices.com\/how-to-troubleshoot-fix-p0420-jeep-dtc-code-ultimate-guide\/","title":{"rendered":"How to Troubleshoot & Fix P0420 Jeep DTC Code? (Ultimate Guide)"},"content":{"rendered":"\n
Being a Grand Cherokee owner, it is quite common to experience sudden DTCs such as P0420. Other Jeep variants, like Patriot and Wrangler too, are not safe from this code.<\/p>\n\n\n\n
Fortunately, this problem has some straightforward causes and remedies, allowing you to fix it pretty simply at home without spending tons at a garage. <\/p>\n\n\n\n
So buckle up, and let’s learn more about the P0420 Jeep Grand Cherokee code, Wrangler, and Patriot and how to get rid of it easily.<\/p>\n\n\n\n
The P420 is a diagnostic trouble code for OBD-II-enabled vehicles. For Jeep vehicles with V6 or V8 diesel engines, such as Wrangler, Patriot, or Grand Cherokee, the P0420 code specifies that catalytic converter efficiency is below the threshold. <\/p>\n\n\n\n
However, there would be two catalytic converters for some variants of Jeep with dual exhaust systems. <\/p>\n\n\n\n
In such cases, the code would specify which catalytic converter fails to do its job, denoting the system as Bank 1 or Bank 2.<\/p>\n\n\n\n
If we break down the DTC P0420, we get the following estimations:<\/p>\n\n\n\n
In Jeeps, there are two oxygen sensors with each catalytic converter. The first one detects the composition of gases from the raw exhaust coming from the engine cylinder.<\/p>\n\n\n\n
The second oxygen sensor is attached at the end of the catalytic converter and detects how much the exhaust gas has been refined. <\/p>\n\n\n\n
Hence, the ECM analyzes the difference in the data from each sensor to know the efficiency of the catalytic converter.<\/p>\n\n\n\n
Therefore, if we sum up the code, P0420 means the downstream oxygen sensor attached to the catalytic converter fails to detect pollutant-free incoming exhaust.<\/p>\n\n\n\n
Now that you know what the P0420 code means on Jeep vehicles like Grand Cherokee or Wrangler, let\u2019s look for the causes of this issue. The most common causes for which the code is stored include the following:<\/p>\n\n\n\n