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Here is my 2 cents.
When buying a new car i want to make sure that there are no Major issues. Even if you could detect that the injectors are not good, its not really a reason to not buy a car it would me more of a price haggle thing..
So To answer your question the sophisticated devices that can read all PID sensors through the CAN protocol will give you alot of information and people on this forum will recommend the Schwaben tool but i dont think these tools are necessary for detecting major issues.
The issues you listed are not major and not a reason again not o buy the car.
What i recommend is that you do a compression test. Check fluid condition.
Listen for odd noises and if you can use a tool check the oil pressure at normal operating oil temperature.
Oil Pressure tells you alot.
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