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Old 10-17-2017, 04:14 PM   #2
wdchparks
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Re: 2006 Highlander P0420

The Plan

I read as much as I could on what was posted out on the wild web. I think I read the Pre O2 sensor controls the engine, and the post O2 sensor monitors the cat.

Since the code is ambiguous at best I am going to replace the post O2 sensor as soon as I can get my daughter to bring the car by. Also it seems my scanner does a little more than clear codes so I will read the data it holds when the code comes in.

As soon as I do it I will post back the results in a few days
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