XG350 fuel injector and now EGR problems

I had a fuel injector go bad the other day on my 2002 XG350 - apparently it
was spraying gas all the time. I was able to limp home and then got screwed
by the local garage when they fixed it. $600 to replace a fuel injector and
do shoddy work like forget to plug one of the electrical connectors back
together, leave the back 7 bolts on the plenum lose, forget to tighten one
of the hose clamps on the air snorkel altogether, and over tighten the oil
filter when they changed oil (that I didn't authorize). But all that is in
the past, or is it?

A few days later the check engine light lit up and the code is P0401, EGR
flow insufficient. Needless to say, I don't want to bring the car back to
that garage (I'm sure they could scam some more money out of me - they were
really slick). From what I could get out of the web site and my service
book, this almost looks like a low vacuum problem rather than an EGR valve
problem. Any recommendations as to how to fix it? I have a second 2002
XG350 that I can swap parts back and forth with. Also, If the EGR valve is
a suspect, how does it come off? There are 2 bolts that hold it to the
polonium, but then there is a big nut connecting it to a tube...looks like
there isn't enough room back there to get a wrench on the nut. If the nut
does come off, is there some sort of thread sealant required when you
re-install? sparkplug antiseeze compound maybe? Also the manual stated
that the EGR gasket should be replaced. How important is this? - I've done
spark plugs a couple times and have never bothered with the EGR gasket.

Thanks

Dan

Check the small things first. Make sure the shop connected the vacuum
lines properly and that the EGR solenoid is plugged in. The shop may have
removed or disconnected the EGR valve when removing the plenum to access
the injector.

A quick check of the vacuum lines is to use needlenose pliers to pinch off
the hose with the yellow stripe while the engine is idling. This should
cause the EGR valve to open and the engine to run rough. If this occurs,
you can pretty much conclude that the hoses are run correctly and that the
EGR valve and passages are functioning normally, leaving the EGR solenoid
and vacuum bleed-off valve as possible culprits.

It's doubtful that the EGR valve is the problem, but I've seen it occur.
Before swapping parts, use the other XG to verify the proper installation
of all parts.

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