Check engine light comes on after last 3 visits to the dealer.

It depends on the gasket , a valve cover gasket would be less then an oil pan gasket ! Both valve cover gaskets $150- $ 190 , Intake manifold gasket $ 547 - $698 , Head gaskets $1,000 - $ 1,200 oil pan gasket $ 211 - $ 269 These are just estimates , not all repair shops charge the same . Here in Pennsylvanian local shops like pep boys charge $115.00 per hour , AAMCO does general repairs too , an they charge $ 95.00 per hour . I found the local Chevy dealer to be one of the cheapest around at $86.00 per hour ! It just depends on where you live ! you have to check around , Do let them bully you either , Ask what they charge to do you particular gasket an if they give you the run around tell them you'll try someplace else ! They always say well we will need to check it out first ! good luck hope this helps an may god bless you !!!!!!

We don't know your level of expertise

I would say, never go to a dealer & only
to a repair shop, if you can't do ALL your
own work

I think we all just live in a world of automobiles,that have
too much high tech technology,when not so much is needed,
just to keep exhaust emissions at an acceptable level

At least you kept going back to the dealer & not keep driving
as most people do

You gave the dealer techs several chances at resolving the issues,
all be it, expensive, to say the least.

I don't see anything where you went wrong, or they let you down,
assuming your good to go & no more issues

I assume that the head gasket was something that only moved
& leaked internally under certain conditions & I don't know why or
when the ECU came up as a problem,they don't fail often

if the dealer charged you to fix it the should fix it for no extra charge

Check engine could be any of many faults but instead of going to dealer, stop by a local Autozone, Advance,etc auto parts store and have them perform a FREE fault scan. They'll come out to your car, plug in their scanner, read the codes, print you out faults found (in ENGLISH - not code) and advise you, then they'll reset your lights - best part - FREE

dont have it disconnected make them fix the problem the computer needs to be reprogramed

dearship parts are high.you can buy a factory catalytic converter or universal converter cheaper at auto parts place.they basic the same parts the.dealership has same catalytic converter.they put their price and labor rate charge an hour your pocket book will be empty.i have used universal catalytic converter.had no problem with it.the only difference is universal converter body a little shorter.but has same lengh as factory.if check engine is coming on you cant turn it off .if computer showing you a code.you could have a misfire causing rich exhaust emission.that can ruin a catalytic converter have it scan.dealership charge you about $130.00 .you can have it scan at advance auto or auto zone.to see what pcm code is.it could be oxygen sensor somethinh minor.

GO TO AUTOZONE OR YOUR LOCAL DEALER AND HAVE THEM PLUG IN THE DIAGNOSTIC MACHINE. IF THERE IS NOTHING WRONG HAVE THEM RESET IT. AUTOZONE WILL DO IT FOR FREE. DEALERS WONT

this problem could be caused by the mass air flow censor, i had the same problem with my car. it is really pricey at the dealer so you might want to check elsewhere for this part. I found one at a scrap yard for 85% less that the dealer and i also got life time warranty, the dealer does not offer any warranty on this part.

check the wire and connection at the ignition switch