Question

2006 Lincoln LS 3.9L V8 has the engine codes P0108 and P0406 any ideas? car runs great

Answer 1

P0108 MAP (manifold absolute pressure) sensor circuit high

P0406 EGR (exhaust gas recirculation) sensor A circuit high

These codes are for the EGR module the EGR and MAP are one unit, what monitors the EGR system is a MAP sensor built in one unit, Because the EGR is in a closed position and is non-operating it takes a CK ENG LT to tell you it has failed. The purpose of the EGR is to limit the amount of Nox that is produced and emitted into the atmosphere which is a contributor to air pollution.

 

This is the EGR system it houses a MAP and a EGR

Answer 2

P0108 LINCOLN - Manifold Absolute Pressure/Barometric Pressure Sensor High Input
Read more: https://www.autocodes.com/p0108_lincoln.html

P0406 LINCOLN - Exhaust Gas Recirculation Sensor 'A' Circuit High
Read more: https://www.autocodes.com/p0406_lincoln.html