What Does SYSTEM LEAN Mean For Your Car

What The Heck Is SYSTEM LEAN? No one 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. 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 me today as we discuss:

One of the most asked questions I get
Perception of unmetered air/not enough fuel
Calculation based on feedback from sensors
How does it happen
O2 sensor voltage
Correction by ECM
VCDS Reading
VCDS Demo
System Rich VS System Lean
Diagnose system lean on my Passat
and more

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