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Wont pass smog, code P1491 and P1698 - Grand Caravan Dodge Cars & Trucks

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: car wont pass smog.

Is it running rough? Is the check engine light on?

Posted on May 27, 2009

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SOURCE: I have a 98 Ford Explorer that wont pass smog and

take it to garage that tests the emmisions with a probe up the exhaust pipe ,they should not be allowed to test by OBDII and read codes ,this code is nothing to do with the engine .On a europeon market vehicle any car from 2005 cannot be read anyway owning to encrypted software only the dealer who connects vehicle to internet to factory can read the software .

Posted on Oct 28, 2010

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SOURCE: wont pass smog , check

This code relates to the operation of the electronic EGR system. You can remove the EGR valve and make sure that the ports are not "carboned" up. If they are, use a good carburettor cleaner and a screwdriver to aid in removing the build up. Once that is accomplished, reinstall the EGR and see if the system cleans up. this can also improve gas mileage. If the light remains on, replacement of the EGR valve may be required. Let me know of you need anything else.

Posted on Aug 13, 2011

  • 459 Answers

SOURCE: My 1994 Toyota pickup is showing code 25, and I am

The code 25 is an O2 sesnor code lean condition, the problem is usually not the sensor but another problem, it can be caused by an engine misfire, if that's the case the cause for the misfire has to be corrected first.

Posted on Aug 24, 2011

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I would take the car to an Auto Store like AutoZone, Pep Boys, O'Reilly etc. Ask then to read any stored codes with their code reader. If you find one or more codes it may point to a defective part. Until you do that you can't tell why it won't pass smog.

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4 Answers

What does the diagnostic test code P1491 means?

Hello jhonney21,

The P1491 is Radiator fan control relay circuit code. It is set if an open or short circuit is detected in the radiator fan relay control circuit.


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