Question about 2002 Nissan Sentra

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P1456 code will a p1456 code cause a miss, or do I have two problems

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  • ken hane Apr 01, 2014

    replace your gas cap, as far as your miss goes, replace the spark plugs and plug wires, and fuel filter. start there and also change the distributor cap and rotor. winter weather clogs your fuel filter, you should be good to go

  • Todd Arndt
    Todd Arndt Apr 02, 2014

    Ken is correct, the Gas Cap is normally the most common problem with the EVAP System but there are a few more that it could be. His comment to give the tune up will take care of your misfire. Thank you Ken..... Spot on recommendations...

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  • Nissan Master
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Your Code P1456 is a EVAP (Evaporative Emission Control System Leak Detected). Normally this is a leak in the System and will not cause a Miss. The Fuel goes to the Fuel Rail and the Excess is sent back to the Fuel Tank via the EVAP System. There is a Purge Valve on top of the tank that is probably causing the leak. The Miss is another issue (Spark Plugs, Ignition, Coil, or clogged fuel filter) would be where I would start.

Posted on Apr 01, 2014

  • Ron Townsend Apr 02, 2014

    replacing the fuel cap is a cheap fix and no one ever thinks about it. you've probably still have the orginal cap.as far as the miss check your pressure make it's up to par, keep in mind the timing belt if it's never been done before

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I'll try tighting the gas cap.
clear check engine.
if code come back, replace gas cap and clear check engine light again.

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in this case you need to see a dealership-they will perform evap function test and determine if problem is worse-1457 is the bad one indicates large leak and can be expensive,. hope this helps.

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