Pulled a P0171 Code? Humble Mechanic Helps Explain It
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From the Magazine

Pulled a P0171 Code? Humble Mechanic Helps Explain It

Too much air or not enough fuel at the engine. System lean is not hard to diagnose, once you understand it.

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Humble-Mechanic-System-LeanNo customer likes when the check engine comes on in their car. One of the more common issues with check engine lights is a system lean fault P0171 is the most common fault code.

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This fault can be tricky to diagnose if you don’t understand what system lean really means. This can be too much air or not enough fuel at the engine.

System lean is not hard to diagnose, once you understand it.

Join Charles today as he discusses:

– One of the most-often asked questions

– Perception of unmetered air/not enough fuel

– Calculation based on feedback from sensors

– How it happens

– O2 sensor voltage

– Correction by ECM

– VCDS reading and demo

– System Rich vs System Lean and more.

 

Click here for the video!

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