P1406 Isuzu -

Question

P1406 EGR pintle position sensor circuit fault.
Should I just replace EGR valve?

Answer 1

P1406 EGR valve pintle position circuit

What set this code is the pintle position is less than the desired EGR position that the ECM wants or greater than what the ECM wants. Its possible that carbon deposits can interrupt the opening and closing of the EGR valve, Depending on the EGR in most cases replace the EGR solves the problem,

 Here a EGR this is stuck open , being stuck open set a misfire condition at cylinder 3 and 4. If you push down here at the pintle it does not move properly, this would require a replacement of the EGR valve.

 Here the replacement EGR, it pintle position moves very smoothly.