Question about 2008 Buick Lacrosse

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Egr valve replaced and check engine light still on

Replaced egr valve and drove over 100 miles thinking it needed to reset itself but light is still on

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  • 78 Answers

You may need to disconnect the battery for 60 seconds to get it to reset.

Posted on May 13, 2014


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Posted on Jan 02, 2017

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SOURCE: "Service engine soon" light is on

If you have the 3.1 engine, they are prone to having the egr passage clog up in the intake. There are 3 solenoids on the valve that open under differant load conditions. Sometimes during high egr flow demands the passageway is clogged enough for the computer to see not enough change in map or o2 sensor readings. Take off the valve, open up the throttle and see if there is carbon deposits caked up where the egr port is. If so get some GM top engine cleaner spray and a wire and clean the passage. This is a common problem.

Posted on Nov 27, 2008

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SOURCE: replace egr valve

Your 2001 Buick has digital linear EGR valve, and should be able to be replaced and the SES light cleared. When the conditions are correct, while driving, the computer will open the EGR valve and watch inputs from the valve itself, as well as the MAP sensor, and Oxygen sensor to verify proper operation of the EGR valve. There is no reprogramming required to change an EGR valve on a 2001 model year Buick. General Motors may have a re-flash available to correct an EGR issue, and sometimes they recommend this re-flash with a new part. I checked my sources for you and could not find any TSB (Technical Service Bulletins) that are associated with EGR valve replacement, or re-flashing of the computer to correct erroneous EGR codes. Regrettably, it sounds like you have an issue with your mechanic, and POSSIBLY a misdiagnosis. Hope this helps!

Posted on Feb 01, 2009

  • 5158 Answers

SOURCE: DTS-P 1404(EGR Valve)

unhook the battery for ten minutes and hook it back up... that will clear the code... if your stereo requires a code make sure you know it first.


Please take a moment to rate this solution thanks

Posted on Feb 09, 2009

  • 147 Answers

SOURCE: Check engine light on. Code P0440.

wow thermostat >>>> shucks i believe its evep emissions code like faulty gas cap can reset any computer the chck eng light will come on in 50 to 100 miles if not fixed....

Posted on May 08, 2009

  • 33 Answers

SOURCE: 1996 buick century, I had a tune up and egr valve

Have an auto parts store check for the code. It is possible that you have a bad O2 sensor or your catalytic converter is clogged.

Posted on Apr 10, 2010

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