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My 2010 Subaru feels like it has been tampered with and is now throwing a bunch of random codes as well as the radiator fan kicks on and off repeatedly while the car is off but the key is in the on position.

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    Check under the driver dash there should be a green connector that should normally be unplugged. Was any work done recently?
    – Ben
    Commented Sep 21, 2017 at 22:34
  • Blinking check engine light is usually a bad misfire. What codes is it throwing? Commented Sep 23, 2017 at 2:05

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Look for a bad ground or grounds. Battery, battery to block, etc. Clean those junctions down to bare metal. Multiple random codes means you are seeing back feeding from circuits that are looking for a ground path. That confuses the ECM's diagnostic process. Normally a flashing SES light is due to a misfire that will cause imminent catalytic converter damage. Code 300 is the misfire code. Sometimes code 301 is cyl #1, 302 cyl #2, etc. depending on manufacturer. Use star washers on your grounds to bite through paint and rust.

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