P0420 toyota 4runner

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Log in. Sign up. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. I have had other error codes. Car: 4Runner V6 Took car to pep boys.

P0420 toyota 4runner

Discussion in ' 3rd Gen 4Runners ' started by obx4runner , Dec 31, Log in or Sign up. Toyota 4Runner Forum [4Runners. Welcome to 4Runners. You are currently viewing as a guest! To get full-access, you need to register for a FREE account. Quick Links: A code scanner? O2 sensor in Computer codes and check engine light. Post Reply. I recently bought this 3rd gen with K miles.

If you have a bad cat, be sure you fix any major coolant burning or oil burning problems before p0420 toyota 4runner replace it, because it will ruin the new cat and or o2 sensors. AZBub Senior Member.

Remember Me? Site Navigation. Member's Picture Albums. I know there have been countless threads on this error code, but since I got my 4runner down to Florida it has been popping codes. I have had it cleared a few times, no big deal. Here's the strange part though. The other day I was playing around at one of the state parks, going a bit fast on the dirt roads with my 4wd on, and the strangest thing happened.

Remember Me? Site Navigation. Member's Picture Albums. Check Engine Light intermittently comes on and off, for almost a year. Done the following: 1. Replaced Bank 1 Exhaust Catalytic converter manifold. Ran cataclean in fuel system.

P0420 toyota 4runner

This page is meant to help you troubleshoot the Toyota 4Runner P trouble code. A failing oxygen sensor or bad catalytic converter are the most common causes of P Catalyst system efficiency is the percentage of these chemicals removed from the exhaust system. Oxygen sensors measure these pollutants. 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 P This can happen for three reasons:. You can ignore this section if your 4Runner has an inline engine or if the exhaust manifolds merge into one pipe before the catalytic converter. Typically, the first cylinder is closer to the front of the engine. The bank 2 version of this code is P

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Hope that helps a little bit. They were clean as a whistle, open and in goo shape. To get full-access, you need to register for a FREE account. Thanks for the response jimlaw3 I hope it's not the cat either. Rate Thread. I dont really know what to try next. Welcome to 4Runners. Originally Posted by Robb They should be different. Certainly keep us posted on what you learn. If you have a analog multimeter with needle or a digital meter you can backprobe your sensors and time the crosscounts thats really what the computer is looking at. Not sure though. Jonesy Replies. I have solved the issue.

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Jonesy Replies. Code P, Cat or O2 sensor? Forum Rules. National Wheel Seal. P is a code for the Bank 1 Catalytic Converter output. It is a limited 4wd with a v6. I replaced both o2's and it went away for 5mounths and then it came back--I had it reset a few times and it would stay off for a few tanks of gas and it did shut off by itself at least twice. On my 97 4Runner, the two O2 sensors are identical. Mark Forums Read. Thanks for respponding! Any help would be appreciated. Hopefully my light stays off. I have solved the issue.