The Jeep is home safe and sound. Finally.
They left a message last night to call them. I called them this morning. The Jeep was done, but get this. The service writer said he wouldn't release the Jeep until the plastic engine cover was back on because "it was a vital piece of the motor" (I had left it in my garage since I knew they were going to work on the engine). What a dork. So instead of picking it up after work I had to burn vacation time to go get it and inconvenience my girlfriend to take me up there.
Good thing I went unarmed to the dealer.

I walk in and John the service writer says there was a mixup and your Jeep isn't done yet. He checked and it still needed the boost sensor. He said the part had arrived this morning. They would give me a call later when it was done and I could come back and pick it up. At this point I could feel my blood boiling. I told him I had a boost sensor at home that I could put in myself. He then starts lecturing me about how I've changed my exhaust, and since I know the boost sensor is bad that I've obviously been messing with the motor, and how I need to leave the plastic engine cover on since it's a vital part of the motor, yada, yada. I'm one of those people who never get mad at anything, but I was thoroughly p!ssed at this point. I held up my hand and said, "John, I understand your position. Give me the keys. I'm taking the Jeep home." He started into how it needed to be done there under warranty and I repeated myself. He gave me the keys and I drove it home.
Despite the Check Engine still being on it never went into limp mode on the way home. I'll fix it tonight and hopefully be done with it.
I'm sitting at home now drinking a Coke trying to calm myself down before I go to work. What a bunch of idiots.
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My Jeep Liberty pageORM, air filter mod, and less restrictive exhaust has increased my 'everyday' driving 3 mpg.