Question about 2004 Chevrolet Impala

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Ggr valve light still on after i replace it - 2004 Chevrolet Impala

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Have you reset your computer codes since you fixed the egr valve? If you haven"t then go to Auto Zone and have then reset your codes with the scan tool,it is free to have this done..Then see if the light comes back on..

Posted on May 25, 2011

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There may be also a flow sensor in line with that valve, also check for split rubber hoses.
On mine, a dose of intake cleaner in the valve and sensor and a replaced split hose turned off the light.

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Service engine soon light on, obd says egr valve


You should be fine. Usually what happens is when such a part causes the light to go on, the light will continue to come on again a few time after replacement of the part.

Simply disconnect the battery and let it sit for about 1minute (oat least 30 sec). Then reconnect the battery.

Drive the vehicle and if the light still comes one, take it to an auto parts dealer that can do a diagnostics test and ask them to clear the codes.

Even after this the light may come on - drive for about a week more and if it still stays on, then have the test done again and replace any other part that any codes may present faulty.

Otherwise, sometimes it itakes the computer and engine to adjust to the new part and get an accurate (consistant) reading until the light will stay off.

A lot of the time a light will come on if the O2 sensor(s) are bad. This isnt' a huge issue right aways, will slightly affect feul mileage and the amount of exhaust return into the engine for being reburned. Replace these if necessar (and if affordable).

Please let me know if you need any further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

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1 Answer

EGR Valve replacement and Check engine light


Error code will have to be cleared. The way that cars know when to turn on the check engine light is that there is a recurring error for "x" miles or time, as long as that error exists in it's memory most cars will continue displaying the check engine light.

Dec 02, 2009 | 2001 Chevrolet Monte Carlo

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The check engine light stays on or comes back on when doing smog test. It passed everything on the smog test except check engine light. The indicator code is P0446.


Hi:
Your P0446 code is a Evap vent valve code: Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
copyscape.gif Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes A code P0446 could mean one or more of the following has happened:
  • Faulty vent valve
  • Open, short or excessive resistance on Vent valve control circuit
  • Blockage of vent valve
  • Bad PCM
Possible Solutions With a P0446 OBD-II trouble code, here are some things to try:
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM

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SERVICE ENGINE LIGHT ON FAILED EMISSIONS


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

Check engine light won't go off to pass inspection


No Biggy.. Get them to install a DPFE sensor,, ( its the one that regulates the EGR valve ) Most ppl mistake a 1409 Code as Being EGR and it is kinda.. but when the valve maint fails.. its almost always the DPFE sensor.. Try that and lemmie know

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4 Answers

Replace egr valve


If the replaced the erg valve and the light came back on, you still have a problem, probably different then what they fixed.

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