EGR Valve

Code p0401 is for incorrect flow, this does not mean the egr valve is faulty, which apparently you found out the expensive way. There is no vacuum hose on this vehicle that goes to the egr. the valve bolts directly onto the intake and there is a tube that goes to it, that tube is exhaust. If something is clogged, it would be clogged with carbon. You'll need a high powered solvent. Something that is safe for the engine. Throttle plate cleaner will do, but there are better products out there.first spray the visible carbon, let soak and soften. you should be able to eventually poke through it then clean really well with pipe cleaners, keep using your solvent though, you do not want to knock chunks of carbon into the intake, they'll get sucked into the engine and may cause engine damage. It may be better to remove intake altogether, easier to clean and less chance of damaging the engine.