05 GC - P0404 and P0406 - EGR Valve and XZZ option code questions
I am getting these 2 codes on my 05 grand caravan (3.3L), it has 118,300km on the clock right now and has had a light throttle 50-80km/hr stumble for the last couple of weeks (~1200km) that has been getting progressively worse. I was planning on changing the spark plugs at 120,000km (have them on the shelf just waiting) and just assumed the stumble was related to old plugs or wires as mileage was unaffected and the van ran great at higher throttle positions. Yesterday I decided to plug my scanner into the van to see if anything looked off and I found a pending P0404, then while I was logging spark timing at about 95km/hr coasting down a hill it set a P0406. Neither code will clear for me so the problem must be persistent.
I have done some digging around and it looks like I am in for an EGR valve replacement as either the valve or the sensor has gone bad and they are integrated into each other.
I checked my local parts store and they wanted to know if I had option code XZZ on my van to establish which EGR valve I require (EGV823/EGV830). Unfortunately I have no idea what that option code is or how to tell. Any hints here? It looks like maybe if I have the valve with part number 4861636AB, 4861636AD, 4861635AF or 4861662AA then I do NOT have XZZ, and if I have the valve with part number 4861662AA, AB, AC, AD, AE, 4861663AA then I do? I am only guessing this based on parts descriptions on Rock Auto so I am not super confident in this.
Also, before I go shelling out the $190 for a local EGR valve, or ~$80 for one shipped in from rock auto, can somebody tell me if there is a method to test the EGR valve and it's wiring? I looked in my FSM and it only has a very short section about the EGR system on the 2.4L, I see nothing in there for the 3.3L. I searched around the forums and found various mentions of testing for 5V at the connector, but without knowing more details I can't make a conclusive test out of that. Can anybody give me some insight on this? Can I test the valve to ensure it is faulty electrically? If it isn't faulty and is just jammed up I would prefer to just clean mine instead of replacing it.