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Code Reader Podcast: P0172 System Too Rich, Again

I was looking through some TSB’s and realized when we did the original P0172 podcast, I completely forgot about one possible cause of the problem that has actually been fairly common for a long time. And in reality, it’s so simple and so basic, that it could be easy to overlook. Excess fuel in the engine oil causes DTC P0172 to set, and the solution is an oil and filter change.

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