<prompt> Human: Ive had a lot of issues since May with my 2012 Mazda6.I live in Houston, and my car was flooded by the Memorial Day storm. The car was towed to a shop where it sat for over three and a half weeks because of he saidshe said bullshit between the shop and Geico. Shop said Geico never sent over original estimates, Geico said no supplements were ever faxed over, etc. Got that shit sorted out, it was sent to my Mazda dealership by the shops request because it was mainly cleaning that needed to be done, and the repairs were done in just over two weeks. I can pull up everything that was replaced, but essentially all of the interior cloth was the water came up 34 of the way to the tires from the water lines, wiring was lubed and dried, etc. I got the car back probably sometime in the middle of July, and everything was fine.I did experience both headlights go out one after the other but replaced those, and everything was all right.Until last fucking week.On Wednesday, my engine light turned on. Awesome. The car rumbled a little, but I took it to work and back less than 5 miles round trip. Thursday morning, I turned it on, and while on the way to work, the light began to flash. The car stuttered and had problems accelerating. I turned around, drove home, and called the Mazda dealership that did the repairs before, explaining the problem. The earliest appointment was yesterday at 1:30pm, so I agreed to bring it there and did not drive it until absolutely necessary on Tuesday. They made no indication of needing to tow it there, and the dealership is right down the road, and the engine light did not blink yesterday.I have an extended warranty with the dealership bad idea and thought it would be covered. Nope. Apparently a number of things:1 bad spark plugs2 some sensor is out they spoke to my boyfriend, I can ask the exact name of it; this was covered by the warranty3 carbon is getting into the fuel injectors and fucking it up4 my drive belt is crackedThe repair cost is over 800, which I can pay, but would all of this happen within a month and a half of it being repaired? Mazda insists that it isnt flooding related and is maintenance repairs so that the warranty cant be used. My mother is suggesting I call Geico immediately, but can they do anything if the dealership is saying it wasnt a flood issue?I still owe 10k on this Mazda, otherwise I would dump it and get something older and more reliable. My boyfriend thinks Geico wont bother to help, but they did pay 6k to them, and now more shit is popping up...edit: Boyfriend has given them authorization to fix the vehicle and wants to just pay the 800 and get it over with. We fought Geico for months and are just tired. My mother is urging us to fight it and have Geico settle it, but if Mazda says its not water-related, I dont know what Geico will do.  <response>: Former ASE Master diagnostic tech here. A flashing engine light means severe misfire that will potentially damage the emissions systems. Its generally caused by major system issues like low fuel pressure or timingfuel metering sensor failures.The belt has nothing to do with the misfire and its literally impossible for an accessory belt alone to cause a misfire. It may be needed maintenance but its not caused by a flood either on that short of a timeframe.Bad spark plugs can definitely come from flooding but Id need to know exactly what was wrong... Carbon fouling or burnt electrodes would be maintenance but you might have a case otherwise. If water caused it, however, your ignition coil boots are smoked as well and would honestly be the more likely cause of failure. This would require the car to have been in around 3 feet of water in either case for the flood to be the cause. The code they pulled would also be a P030x where x is the cylinder number. If its P0300, its not going to be a plug on a flashing MIL.The injector fouling is just an upsell. Yeah, they get carbon on them but Ive never seen a fouled injector cause a major problem like a flashing MIL. Its generally a burnt out solenoid or clogging from bad fuel on the inside, not engine carbon.If I were betting on it, I would suspect the sensor is the camshaft or crankshaft position sensor or maybe the mass airflow sensor. It was probably bad and causing the light. Very, very commonly the cause of a flashing MIL as the computer will substitute best guess values to keep the car running. After replacing it, all will likely be OK and the rest was just gravy work for the tech.My recommendation when they pick it up is to make sure youre paying no diagnostic fee. That will be included in the warranty for the sensor. The plugs and all are simply maintenance and required no such diagnostic so theyd be double-dipping if you pay up.Tldr; two items would never be authorized so theyre on you. Two are potential causes but are mutually exclusive. Youd have to prove the plugs caused it and even then, thats the only item that would be reimbursed. 