Question about 2004 Nissan XTerra
Failed Emissions at MA State Inspection
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Posted on Jan 02, 2017
SOURCE: pcv valve and emissions
when you are looking at the motor it is located on the valve cover it has about a half inch diameter hose attatched to it. i belive it threads into valve cover. also try going to local auto parts store and look at a haynes manual
Posted on Dec 27, 2008
if the scanner will not communicate with the ECm, First check all the fuses under the hood. If all is well, make sure you have the key on and not off or running. If all is good there then the computer for the car has taken a vacation on you and will need to be taken to the dealership for repair/re-programming.
Posted on Aug 10, 2009
I had the same thing but it was my sparkplug wire was arching on the valve covers. my rmps would drop at idle so i look at the engine at night time and could visualy see the electrical arch real easy ,and the computer on your car reads the arch as a misfire, which it is, but the cause isnt your knock sensor just one cylinder is not having a fuel mixture ignition due to the spark not conducting throught the plug and ignighting the mixture.hence ur miss fire. Also ur can hear it, it kind sounds like a snaping noise once you have poped the hood that helped me find where it was at.
Posted on Feb 22, 2010
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Knock Sensor Circuit High Input (Bank 1)
Knock sensor signal circuit is open.Knock sensor signal circuit is shorted to VREF or system power.Knock sensor is damaged or has failed.Trouble Code: P0420
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