Possible causes

– EGR passage clogged
– Faulty EGR Vacuum Modulator Valve
– Faulty EGR Valve
– Faulty EGR solenoid valve
– EGR solenoid valve harness is open or shorted
– EGR solenoid valve circuit poor electrical connection
– Dead (Weak) battery
– Faulty EGR temperature sensor and circuit
– Exhaust gas leaks

Tech notes

EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages. If the tubes are clean you may have to replaced the EGR Pressure sensor to fix the problem.

There is a factory service bulletin for the following Lincoln models:

2001-2002 Lincoln Town Car
Lincoln Factory Service Bulletin OBDII Code P0401 Code

When is the code detected?

Low EGR flow control is detected

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Possible engine hesitation

P0401 LINCOLN Description

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control