Pilot 2004 engine check lot and vtm light on dash error code p1491 reset still comes back car runs fine?


Asked by Aug 08, 2016 at 08:43 PM about the 2004 Honda Pilot

Question type: General

EGr issue not gas cap prob new one error p1491 don,t know what to do next
reset several times

3 Answers


Normal lift sensor voltage on a closed EGR valve is 1.1 or 1.2 volts. Watch the voltage on the scan tool or back probe the White/Black (WHT/BLK) wire. Remove the Pink (PNK) wire out of the connector at the EGR valve and apply battery voltage to that terminal to operate the EGR valve manually, the EGR valve should open and the lift sensor voltage should increase from 1.1 volts to around 4.0 volts. Always verify that the voltage does not drop out when the valve is operated, or the code will also set. The EGR valve is a common failure. Also if the EGR passages are restricted, it can set this code.

Best Answer

Will try this. Thank you


Replaced Egr valve all is good .couldnt get pins out of plug to check. Thanks for the help

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