Hi,
Too many vague questions. But, the MAF wouldn't have anything to do with an RPM sensor. Usually, an OČ sensor code is thrown on a bad MAF. It could be a completely separate malfunction and merely coincidence, but it is suspicious as it just came from Dealer Service. Also, they first admit and then retract their fault in the matter and a hiss indicates either a vacuum or pressure loss/leak which is what makes the sound. Since they replaced, disconnected, numerous hoses and sensors, this makes them even more suspect.
Bottom line, you're going to have to fix it, the question really is who pays? I would 1st get a quote on the work and then lean on the Dealer to either accept full or at least heavy partial blame and cost of that fix. If not satisfied, contact the local PCNA Service Rep to see if they will intercede on your behalf with the Dealer. Good Luck!...
Happy Motoring!... Jim'99
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