2002 Buick Century "egr" Questions

1998 Buick Century Custom 3.1--service engine soon light is on, I check the computer and it says EGR insufficiant flow code P90401. I changed the egr valve lite still on. Went back to Autozone checked

need buick century egr diagram need buick century egr wiring diagram. Need to know what color wire goes to what number. If your car runs bad with an EGR code then I would suggest that the EGR valve be

...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 p0401 showes up and replaced it and egr valve p0401 showes up and replaced it and still engine stillserges at idale coast speed also replaced all vac hoses i have 1998 buick century replaced

"Service engine soon" light is on We have replaced EGR valve and the light will go out for a little while and then it will glitch and come back on. We think it may be one of the 5 wires leading to it ...

...on Driving is good. I changed;fuel filter ,air filte,spark plugs ,wires.coil pack. Car reads bad EGR and bad OXYGEN SENSERS. Also fuses for sensers blowes out. need to have a fuel pressure test ...

egr flow came up got one from junk yard still no change should i get new or take the car in to a shop I assume you retrieved an EGR FLOW error from your cars computer. Could be 2 or 3 different things

...on my 1998 Buick Century. Auto Zone did their little read out and it said somethings wrong with EGR valve functioning...but then another Auto Zone person said no it could be the selonoid so dont ...

...same. Can you help me? You might have your computer checked to make sure the circuit that controls egr valve is working. On my vehicle, I had several egr valves changed and failed the emissions test ...

i have a 99 buick century po401 code came up? I changed the EGR value and the code still comes up? 99% of the time when a egr code is set its not the egr its the sensor.Now i have only replaced a ...