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Message: <blockquote data-quote="TheBoss8907" data-source="post: 485769" data-attributes="member: 10240">You're going to get an 02 sensor code whenever you have fuel codes. *not all the time, but it shouldn't suprise you.If it recently blew a head gasket, I would check to make sure all the vaccum hoses are connected back, and make sure you don't have any hoses that could stand to be replaced. Just check for a leak, and if you can't find it, spray some carb cleaner. Make sure ALL the connectors for the injectors are plugged in ALL the way, and make sure the injectors are in the seats ALL the way. Then, I'd run a fuel pressure gauge, to make sure you're getting the right amount. If you're not then you know where to start looking.If that fails I'd hook up a noid light, to make sure you're getting power at all the injectors. I bet its just something that came loose or wasn't plugged in, if its right after you had the head work done I'm sure you had some kind of warranty, hell I'd take it back to the shop/person.</blockquote>