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Hello, the dealer said there wasnt any codes stored? How many miles are on this engine?
no codes, what prompted the coils and plugs?
Ok typically when the wrench light comes on it is a throttle body fault, it may or may not set a diagnostic trouble code, but a way to check for faults using a scan tool is to check the difference between the elecrtonic throttle angle actual and the desired data input, they should be within 3 percent of each other. You can replace the throttle body as an assembly and clear codes and reset the keep alive memory and retest for the wrench light coming back on
Need to check the electronic throttle body first, this can and will turn the wrench light on, if it is a trans concern, it should show some sort of shifting issue which you havent mentioned, only a wrench light on. Is it shifting incorrectly, slipping?
Ok well that is a big difference from just a wrench light on. This will be a broken overdrive servo piston clip. The clip breaks and floats into the valve body and jams the a shift valve open so it neutrals when it shifts into 4th, if you turn the od off it will downshift into 3rd gear. This is an in car repair that requires removing the valve body and removing the broken clip and replacing the od servo piston. If there is metal in the pan then there is more damage and a full blown overhaul would be needed.
Yes, big difference in a diagnosis with all the details. If you need more help please let me know. If I was helpful, please use the 5 stars above to leave a positive rating so I get credit for helping you.