Answers: I own a shop, and do extensive computer diagnostics & repairs. I hold seen this problem plentiful times before, and the resolution is this; The position of your EGR spigot is in a place that adjectives that gunk they washed out of your throttle body go straight to, and is now cause it to stick. Once they start sticking, the only entity you can do, is have it replaced. What we do is this; When we verbs a throttle body, we shove a long type rag down into the throttle body contained by order to detain the mess it makes, and to hold it out of the rest of the engine, as this stuff is not sensor safe. A long cloth such as a whole sleeve from a shirt works really all right, and is easy to verbs back out once the cleaning is done. This is a "joke" if they told you it be a pre-existing conditon. What, are they doctors now?? Give me a break. Yeah... they messed your EGR tap up, and they ought to have to fix it. No, and, if, or but more or less it, they did it. Your light didn't come on earlier you took it to them, did it? Proving this is another thing, and the cost of merely having it fixed is cheaper than getting into a directive suit with them. Do this; Get a long pipe, or something that you can hit the EGR spigot with, drive to their shop, and enjoy them watch the check engine reading light when you rap on the EGR valve (at the stub where it bolts to the engine, and not the cannister part), the engine starts running fine, and the insubstantial goes bad. Now, point out the EGR is located under the throttle body, and ask them if they did anything to protect the EGR when they flushed adjectives that crap down into the engine? No one can just permit that stuff go into the engine minus causing this problem, and it is a severely common problem. I hold repaired many vehicle that were taken to the expeditious lube places. Some we have have to go take with the tow truck because they wouldn't even run after the guys within worked on it. They are not mechanics, or do they have any documents as a mechanic. They strip bolts, and do a lot of weaken to peoples vehicles, but I guess this is what you obtain when you go the cheap route. Sometimes cheaper is not other better, and in this suitcase, it will cost over a $100 for a new EGR tap. If they told you it "might" be the gas cap, after it "might" be the engine blowing up to. In other words they have no opinion, and should be ran out of town.
If you decision; you can print out this answer, and take it next to you when you go in that. I think its overwhelming that the authentic mechanics think they messed up.
Glad to back out, Good luck!
Sounds like doesn`t matter what they "cleaned" your fuel system with have damaged the O2 sensor or ruined the EGR spout. Sorry! Don't let folks mess next to your vehicle if it's been running fine to start beside! Good luck! ;-)=
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