Po401 Code
The EGR system needs to be cleaned every 25k in these things. Computer changes/richens fuel mix in response to decreased flow/washes out rings/delutes your oil with fuel. A lot of blown engines were the result of this.
Great way to trash your bearings.
Had the same code and just had mine done, it was so bad that my EGR valve inlet was plugged solid. Had to replace the EGR valve a couple weeks after attempting to clean/save it during the EGR service. Blew an excessive flow code. Valve would stick open, still too contaminated with carbon.
I'll bet you also have an oil consumption problem with your VX as well. They tend to go hand in hand. You probably have a carbon pugged valve and it can't open enough or at all. BUT! Get that Egr service done as soon as you have about $400 to spare. TAKE THIS SERIOUSLY. Let go for too long, it can drastically reduce the lifespan of your engine. Service will be around $200 and (if you need it) a new valve from Isuzu cost $150 wholesale. There are aftermarket valves available from Napa/Carquest/Checker, etc for much less than Isuzu retail.
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