Transmission Solenoid Problems of Suzuki Forenza

My wife owns a 2007 Suzuki Forenza, at around 50k miles, we noticed that when shifting from park, the check engine light comes on and the odometer reads a blinking symbol while a violent jerk occurred. Then when accelerating, the car would have a loud low-pitch hum as if we were towing a bus on ice. I had a diagnostic test ran and discovered that my trasnmission range sensor and my transmission shift solenoid were faulty. Me being a mechanic and all, I call around to buy the part, no luck. So I finally call the dealership and guess what they say? only the dealership has the parts and you're going to have to bring it to us and pay a ridiculous price. I refuse to pay someone else to do a job that I know I can do, especially if were talking about a cost that exceeds $500 for a one and a half hour job. I don't understand why these parts are exclusive to dealers especially when the part is obviously poorly crafted by the makers. So many complaints about the same thing. Why hasn't there been a recall already? or at least make the parts available to the public. This is a serious safety hazard, left turns are a gamble, and I can just imagine the wear on the engine itself. At 50 mph the rpm's are at 3000 to 4000 rpm's! please help!.

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