Question about 2001 Buick Century

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"Service engine soon" light still on

I came to you with the same problem in Nov. You suggested that we remove egr valve since we had already replaced it and open throttele to see if there wer carbon deposits clogging egr port. We did this and used a cleaner and a wire and cleaned out port. There was alot of carbon buildup and we though problem was solved. But light came back on. We hooked computer to it and it came up with 2 codes, P1404 and P1404P. Can you think of anything else to solve this problem?

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  • Coleen Bush Dec 17, 2008

    The light came back on after we reset codes. Any other ideas to fix this problem?

  • dalli37122 Jan 15, 2009

    I have a 2001 buick century with only 14,000 miles on it.. i just got an SES and scanned it.. It has a P1404 code which appears to be an EGR valve problem... I reset the code but it came back beofre i got home with the car... I scanned again and it is the same P1404 code... The car is like new so should i start by removing the EGR valve and cleaning it ? If anyone has the answer please respond.. Thank you

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Most EGR codes will need to be reset with a scanner after corrective action and will not clear on their own.
Hope this helps some.

Posted on Dec 17, 2008

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I meant how do you replace an egr sensor in a 2005 rendezvous?


A faulty egr would not create a high idle issue. if an egr valve were to open while idling then it would create a heavy stumbling engine or it would die right out. if there is a check engine light on (or service engine soon light) have the codes pulled. Failing that then I suggest taking it to a reputable shop

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codes p0402--p0403deal with exhaust gas recirculation control circuit malfunction as well as the performance of this circuit check connections

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Are you sure you have EGR flow?? Hold the EGR valve open the engine should run poorly, if not you have no flow.

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Engin light #po406 2005 ram quad cab


P0406 - Exhaust Gas Recirculation Sensor A Circuit High

Early Models : The EGR valve control the amount of exhaust gas routed to the intake manifold. Vacuum is applied to the EGR valve in response to the throttle opening. The vacuum control the movement of the taper valve connected to the vacuum diaphragm in the EGR valve.

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Late Models : The EGR volume control valve uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECM. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECM does not issue the pulse signal. A certain voltage signal is issued so that the valve remains at that particular opening.

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Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation

Possible causes
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control solenoid valve
- EGR temperature sensor and circuit

Possible solution
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve
When is the code detected?
- An improper voltage signal is sent to ECM through the valve


Hope helps.

Mar 06, 2011 | 2005 Dodge Ram

1 Answer

1999 Mercury tracer EGR Code making Service Engine Soon light come on How do I wipe the codes out? Failed test. Already replaced EGR Valve.


go to auto zone and ask for a there portable engine dianostic scanner. hook it up under the steering wheel inside the car follow the instuctions and write the code down and clear the code while the scanner is hooked up. if you have an employee do it they will not clear the code. when you go back inside they will run the code and it will give you a pretty close idea of what else could be wrong. egr was replaced but it could be an O2 sensor or your exhaust manifold.

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1 Answer

Service engine soon light


if it is for the EGR valve again, replace the valve and the DPFE sensor. Not sure what an EGR regulator is. Could be a bad hose going to the DPFE, or a clogged tube or EGR port also.

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Yes, take it back. The might of replaced the Egr valve to turn off the light. Don't let them charge you for retesting it, that's why you took it in in the first place.

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1 Answer

Service Engine Soon


Hi,

A couple of things you can try:
  • remove the negative battery terminal to reset your car's computer. There are some car stereos that would require a security code when the battery is removed;
  • on your next fill up, try if you can get a higher octane gas instead of your normal, say if you use to put in 91, shift temporarily to 95;
  • add a can of injector/carb cleaner in your gas tank;
  • on a long stretch, drive aggressively and hard. The idea is to clean your fuel system, combustion chamber, valves, exhaust manifold, catalytic converter, exhaust system including your EGR and O2 sensors.
If error indicator persist, trace the EGR wiring with special attention to the connectors at the ends.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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