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PO 401 CODE - 2001 Toyota Tacoma

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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

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

2 Answers

I have a OBD II Trouble Code PO401


PO-401
EGR Flow Insufficient Detected

May 15, 2010 | 1999 Chevrolet Lumina

1 Answer

My 2003 impala was showing the PO 401 code and I replaced the egr valve and cleaned out the line. The light will not reset even though I have disconnected the battery and done many silly things recommended...


You will need to reset the light with an OBD2 scan tool on this vehicle. If it comes back on the problem has not been fixed. It can be cracked hoses, DPF sensor, or the EGR valve solenoid.

Jan 27, 2010 | 1993 Saturn SC2

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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