Question about 1997 Nissan 200SX

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Resetting the Trouble Code after making a repair?

I just ran my 1997 Nissan 200SX Se through emmisiions. It failed due to an ERG valve issue, I have replaced the bad vaccume line on the EGR value so it should be good. How do I reset the trouble codes so I can run it through emmissions again?

Thanks for the help.

Arivn. B.

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Good Day,

It's real easy to clear the code, just disconnect the negative battery terminal, after a few moments re-connect and the code is clear.


Good Luck Hope this helps

Posted on Jun 30, 2008

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Posted on Jan 02, 2017

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1 Answer

Erg flow insufficient


  • The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (tube), most likely carbon buildup
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum
It is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
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  • Replace the DPFE sensor (with a good quality / OEM one)
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The EGR valve is located in the engine compartment. Its should look this

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Symptoms of a bad EGR valve are usually stumbling idle or the engine stalling when the car is warm (normal operating temperature). Find the EGR valve and locate the vacuum line attached to it. Start the engine cold and wait for it to warm up. When the engine starts to stumble, pull off the vacuum line. If the EGR is bad, the engine idle will stabilize and no longer stumble.

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ok you can take the egr valve off and clean it and if that works you my need to take it to get reset on codes other then that also check vacum lines if these do not work you will have to replace and i hate saying that because this part is high.. good luck to you and have a blessed day..

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there is an EGR vacuum solenoid somwhere that controls on/off vacuum to actuate the valve. i am not to sure of the location, but follow the vacuum line back from the egr until you find a device that looks like an electrical check valve for vacuum. that is a possibilty. but then again i am a ford,chrysler guy and am just giving you an answer based on my understanding of the functuality of a vacuum egr system

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