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2004  Nissan xterra 3.3 l p1456 p0442 and p1706 Forums > > 2004  Nissan xterra 3.3 l p1456 p0442 and p1706 2004 Nissan xterra 3.3 l p1456 p0442 and p1706
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  #1  
Old 04-18-2016, 02:28 PM
[email protected] roothess@hotmail.com is offline
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Default 2004 Nissan xterra 3.3 l p1456 p0442 and p1706

Does anyone have any suggestions on how to clear these codes? I have had my xterra since February and it's been one thing after another. I love it, and I just want a fresh inspection s ticker on it. It won't pass emissions with 3 codes! Help!
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Old 04-19-2016, 07:30 PM
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The only way to "clear" the codes and pass the system readiness test to allow you to pass inspection is to properly diagnose and fix those problems. The P0442 and P0456 are likely related to the same problem as they are both related to the evaporative emissions control system (the system that includes the charcoal canister that stores fuel tank vapors until they can be sent to the intake manifold and burned through the combustion process). Unless a visual inspection turns up a split/leaking/disconnected hose or something else obvious (like mouse-chewed wires), it can be tough to diagnose, especially without a smoke machine, capable scan tool and/or Mighty-Vac pump. There is a technical service bulletin on testing the system (NTB09-020a) that can be used with the service manual to help diagnose the problem, which you can find here:

http://x.nissanhelp.com/forums/local...p=10&keyid=740

You might also find a service manual download in the "knowledge base" section, as well. That said, the majority of evaporative emission codes are caused by loose gas caps or a faulty canister vent control valve. Occasionally, you might run across a failed canister in which the foam liner deteriorates and tiny charcoal particles get sucked up into the system. This can be a real pain as you would need to disconnect all the components of the system and blow all of the bits out. To check for a failed canister, you can remove it, remove the purge valve, and shake it over some newspaper, looking for the charcoal bits to fall out. As far as the vent control valve, you can manually test it by apply power and ground to it to see if the solenoid "clicks." Often the valves will stick "open" and set leak codes, or stick "closed," and cause difficulty in fueling at the gas pump.

If you have a manual transmission, a P1706 code usually means you have a bad neutral position switch on your transmission. Of course, you would need to inspect the circuit and confirm this, but a bad switch is often the problem.
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