2006 Mitsubishi Lancer 2.0i Injector Problems

Fuel injectors stuck open, Errors P0141 O2 sensor heater circuit and P0170 Fuel Trim

Recently I did not start my car for 2 weeks due to very cold weather. Obviously I ran out of battery and a neighbor gave me electricity from a portable jump start device. I think the device must have been too powerful as my dashboard became a Christmas tree, and all the lights started flashing (headlights, taillights, interior lights). After the car started, the engine rapidly overheated and one cylinder was misfiring, running in 3 instead of 4. I took the injectors out and tested them and number 3 remained in the open position. Changed it with a spare one, started the car, it worked fine, but next day after I turned it on and off, same. It remained in the open position. I have to mention that for the last 2 months I had the errors P0141 O2 Sensor Heater Circuit and P0170 Fuel Trim but the injectors were fully functional before (they have been cleaned using an ultrasonic cleaner) and the car did not overheat so my question is: Because of the powerful jump start device, could the injector connectors fry so that is the reason why the injectors remain in the open position? Or can it be a ECU malfunction? Or can it be a blown head gasket? Is it related to those codes as well? I also have an LPG system on it, and when i switch the car from gas to LPG, it runs perfectly in all 4 cylinders. No misfire. So that's why I'm thinking that the ECU is good. How can I check all these things? Thank you

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