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Re: 2004 Nissan Frontier Service Engine Soon light ...
P0321 Ignition/Distributor Engine Speed Input Circuit Range/Performance. P1456 Leak Detected In EVAP Control System. Sounds like a vaccuum leak somewhere. I would clear these codes out and see if they come back first. Then if they do I would check to see if you have a vacuum line loose or broken off. If they codes stay off it would be ok to keep driving the truck, but if they came back I would definately get it looked at.
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hi, dear friend, this is an obd2 trouble code table. it can help you understand the meaning of code.
The best way to fix a P1456 error (small evap. leak) on your Nissan is to have a "smoke machine" test done on it. This machine is hooked up to your car and pushes smoke throught the evap. system. The smoke will shoot out of the leak and indicate its precise location. You can also try getting a new gas cap and make sure that it clicks 3 times when you close it after filling your tank. Also, NEVER leave your car running when your fueling up as this can cause your "service engine soon" light to come on. The best choice however is doing the smoke test as this will elimiate any guess as to the location of the leak. Nissan dealers can perform this smoke machine test for you for about $90.00 and can save you alot of money by pin-pointing the leak so you don't keep buying parts you don't need.
Take your Nissan to AutoZone parts store and have them put it on there computer to read what code the light came on for..its FREE...that will head you on the right path...they should tell you what the code means, if not...let me know what the code is and i will look it up for you....Hope this helped you ??
That means you have a failure somewhere in the system (Powertrain, Chassis, Body, Network). Just because the engine was serviced doesn't mean anything. You need to have the diagnostic codes pulled to determine what is causing the light to be triggered. Then correct the problem and the light will go out. If you just erase the light or code it wont solve anything.