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I have a 2002 Century Buick. My service engine

I have a 2002 Century Buick. My service engine line is on. Dignostic test gave P0401. What needs to be done.

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EGR valve sticking.

Posted on Nov 20, 2009


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Buick century service engine soon light

Theres somethin wrong...scan it at a partstore for codes. Dont rush into buying a part if car stil runs. Get mor info. It cud b just a vacuumleak or computr needs reboot by unhookn batt

Jan 15, 2016 | 2002 Buick Century

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2002 buick century brakes will lock after it has been parked for 5 min or 5 hrs and will not move until I go from forward to reverse several time. Intermittent but frustrating.

While I don't have a specific solution to your complaint, I did find a site that lists many, many service bulletins related to braking problems on the 2002 Buick Century. Why not take a look to see if any of these complaints sound like yours.

Good luck.

Oct 11, 2013 | 2002 Buick Century

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Service engien soon light on a 1999 buick century code 401pd

If the DTC is P0401 it means that the EGR Valve is clogged or air flow is insufficient.Take EGR valve off and clean carbon out or replace EGR valve with a new one.

Oct 28, 2011 | 1999 Buick Century

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On a 2002 Buick Century with 3.1 liter motor. "service engine soon" light remains lit. Last week it was the "low coolant" Light that stayed lit. Had a new coolant sensor installed and problem still...

No you need to have the vehicle scanned for the check engine light to see what the code is that has it on. Autozone will do this for free.

May 17, 2010 | 2002 Buick Century

1 Answer

Check engine light comes on with codes PO401 & PO442 where these sensors are its a 1998 buick century

P0401 sets when EGR flow test runs and fails. EGR may be moving too slow or not at all. May be a bad connection.
P0442 sets when vacuum decay test indicates small leak in the EVAP system detected during diagnostic test. Check for a loose or defective gas-cap. If the cap is fine it may be a false code or could be related to another EVAP component.

Feb 18, 2010 | 1998 Buick Century

2 Answers

Where do you put the freon in a 2003 Buick Century

On my 2002 century the low pressure connection is in tnhe center of the engine compartment at the top againt the firewall just below the hood. It has a black screw-on cover.

Aug 20, 2009 | 2003 Buick Century

1 Answer

I have check engine light on, trouble code p0401, how can I fix it. I'll appreciate. Thank's

P0401 = Exhaust Gas Recirculation, insufficient flow.

I would start with testing the EGR valve and checking the source line for a vacuum leak. EGR may need to be cleaned.

Jun 08, 2009 | 2002 Ford Explorer

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Egr valve p0401 showes up and replaced it and

i have 1998 buick century replaced egr check eng light still comes on what can i do

Feb 24, 2009 | 1998 Buick Century

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2002 buick centry

Start with a fuel pressure test first, make sure pump is good before you start throing money at it by gussing.

Feb 07, 2009 | 2002 Buick Century

1 Answer

Orifice Tube - 2002 Buick Century

Some are in the inlet to the evaporator and some could be in the condenser line. You can get a new orifice tube on autozone for $5 - 20,16301861/shopping/partTypeResultSet.htm

Jul 14, 2008 | 2002 Buick Century

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