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Originally Posted by Saulbadguy
1) What the hell is an EGR Valve?
2) How much am I looking at to fix this?
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The exhuast gas recirculation (EGR) system is an important part of the emissions controls in the nissan engine. This also has a large effect on the NOx emissions (my car recently failed emissions due to almost twice the limit of NOx ppm but passed the other parts). You can replace the part, but it's about $100 from the dealer and I've heard people having good results just cleaning it out so I figured I'd try that first. I was able to pass emissions easily after doing this cleaning; it made a huge difference my NOx levels.
If you put your fingers on the underside of the EGR valve beneath the disc part, you should be able to push up on the valve and feel it move. With the car running, you should feel the valve move up when you rev the engine. You can also pull off the upper vacuum line going into the EGR valve and you can feel the vacuum on it when you rev the engine if everything is working properly