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original code was misfire #4. car repaired but still shows misfire #4 won't reset. Repair shop thinks the injector was shut off by computer and may need reset by dealer? Car actually had been running good with just a slight miss, getting 30mpg on hiway. then check engine light came on. After repair shop diagnosed problem car would barely run and check engine light was flashing. Then they did the heads and can't get it to reset that injector?
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If the misfire is totally fixed, then a normal scanner can erase the code. You can also leave the battery disconnected for a while. I would get a second opinion. Use this link to find a shop near you. https://repairpal.com/repair-shops Alex