What do I do if I get a p0405 code on my 2003 ford expedition

Question

Egr sensor 'a' electrical circuit signal had low voltage

Answer 1

HI there

This code means the egr sensor isn't seeing the info it should. This could be the result of a bad egr valve, the sensor or the solenoid that supplies power to the egr. In a lot of cases this code is a result of carbon buildup on the egr tube that blocks the egr flow.

P0405 FORD - Exhaust Gas Recirculation Sensor 'A' Circuit Low

Read more: https://www.autocodes.com/p0405_ford.html