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The code 1125 is your throttle body, when they get dirty or stick they toss up a code. It will need to be replaced or cleaned. On Ford or GM cars we just remove them carefull not allowing dirt or tools to fall in after removing. Get some carb cleaner and clean all the dirt and carbon grime, out of it. be careful not to damage the sensor. Ask shop about cleaner you use not sure about safty on car made in Europe. Put back and things should be ok, If not you will need to replace it. Other code I believe is a junk code. readers seem to be not able to read sub codes unless it is from factory.
This indicates a problem in the transmission control module as it is not activating the solenoids/servos and consequently the sensors that read turbine speed and output shaft speed are not reading the correct difference of the two units . Have this checked out at an accredited auto transmission shop.
Higher octane fuels are used because they are more stable than lower octane fuel.
Low octane fuel is more likely to pre-detenate at high engine temps
Your cx7 has a high compression engine, meaning it compresses the air probably 10.5 to 11.5 times. This generates a lot of heat. Using a lower octane fuel will likely ignite before the engine has completed it up word compression stroke.
I would not advise using a low octane fuel. You can however use the mid octane fuel and you should be fine. Test it out. If it is hotter then 85 degree out constantly i would suggest not using the mid octane fuel