How to fix P0406 Code: Exhaust Gas Recirculation Sensor A Circuit High
What is the EGR Valve?
The EGR valve reduces emissions by allowing burnt exhaust gases to go back into the engine.
This lowers the engine combustion temperature, which reduces Nitrogen Oxide (NOx) emissions.
An EGR valve can be vacuum-controlled and electronically-controlled with many different designs.

Possible Causes of a P0406 Code
Bad EGR Valve (EGR Clogged or Passage Clogged)
Wiring (Open/Short)
Bad Sensor (differential pressure feedback (DPFE) sensor, manifold absolute pressure (MAP) sensor)

By using this information user assumes all risk of use.

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