Question about 2005 Lincoln Town Car

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I have PO 401 code in my towncar 05. What 's the problem?

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I get a code PO 401, exhaust gas recirculation flow insufficient detected. What defected part will cause this code. my vehicle wont start but turns over.


P0401 typically is seen when the EGR valve itself is clogged with carbon, or the vacuum line leading to the diaphragm is either broken/leaking or disconnected. Also somewhere to check is the vacuum solenoid on the other end of the line attached to the diaphragm. If that solenoid is bad, the vacuum will not be applied to the diaphragm at the appropriate time. What year make model?

Sep 22, 2015 | Ford Cars & Trucks

1 Answer

PO 325 DTC was indicated on the diagnostic machine when checked. though i have just PO 105, 401, 1301 but all these have been sorted now left with PO 325. Pls does this imply?


code p0325 refers to knock sensor1 bank1--circuit malfunction===causes--wiring--poor connection ---knock sensor.. Check wiring and connections are clean and tight or replace the knock sensor.. The knock sensor adjusts the air /fuel mixture for proper combustion and reads when there is detonation occurring in the cylinder( Rattling-tinny sound under acceleration)

Nov 13, 2013 | 2000 Toyota Camry

1 Answer

I have 02 crown vic with the po 401 code i replace the egr valve but the code came back on any sugession


Go to You Tube Video & watch a video of the entire
EGR System, assuming you have no reference material,
factory manuals & such

Also Google the codes & study

You replaced a part that fails a lot on a ford, but now need
to find out what other item in that system,brought the light on

Need lots more research using the internet, before you start
installing parts

You have to learn how ALL Parts work & how to TEST them

Apr 05, 2013 | 2001 Mercury Sable

1 Answer

Recirculation exaust gas detected code po 401 2.2 camry auto.... switch?


code po412 refers to secondary air injection(AIR) solenoid circuit malfunction Cause may include Wiring---AIR solenoid and ECM I would replace the AIR solenoid or check for power to it first.

PLEASE RATE THIS REPLY FOR ACCURACY

Mar 23, 2013 | Cars & Trucks

1 Answer

Po 401


the EGR can be stuck wide open causing the code.

Mar 17, 2013 | 1997 Cadillac Seville

1 Answer

Ford winstar 1999 check engine code P0401


PO 401 --- EGR Gas Insufficient Flow

There could be more than one reason for that

Have to know the system & diagnose it

Aug 26, 2011 | 1999 Ford Windstar

1 Answer

230,000 MILES...CHECK ENGINE AND TCS POP ON. READ ON-LINE TO RESET AND TCS SHOULD GO OFF...IT DID. READ ABOUT P0 401 CODE. LOCAL HONDA DEALER REPLACES FOR $444. IN MIDDLE OF WYOMING ON ROAD TRIP...DID...


Yes you did

PO 401 -- is an egr valve, you could have
bought when you got home, at the local auto
parts store for $90.00 & installed yourself

You never clear any codes or dash check lights
They are used to look up codes & diagnose
OBD2 System issues.

NOTHING goes away.

Those dash lights have been on all
vehicle for 30 years & indicate you have
a sytem malfunction somewhere.

May 22, 2011 | Acura CL Cars & Trucks

1 Answer

My 93 towncar runs rough cold. it backfires up through intake i replaced plugs, wires and one coil pack, coolant sensor. i read codes 226 and 542. it runs ok warm, but can still hear misfiring, it feels...


YOU HAVE INTAKE MANIFOLD LEAK ALSO COULD HAVE BAD OR STICKING INTAKE VALVES. CODE PO 226 IDM SIGNAL NOT RECEIVED AND CODE PO 542 FUEL PUMP SECONDARY CIRCUIT.

Mar 12, 2011 | 1993 Lincoln Town Car

2 Answers

I have a OBD II Trouble Code PO401


PO-401
EGR Flow Insufficient Detected

May 15, 2010 | 1999 Chevrolet Lumina

1 Answer

I need to know how to take care of the Code PO 401 on my 1999 Acura TL


your code is insufficient egr flow
problem with your egr valve, 

Mar 30, 2009 | 1999 Acura TL

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