I recently got some bad gas in my car, so I took it to my mechanic and he replaced several fuel injectors and flushed the system and also replaced the fuel pump for the car. After all of this work, unfortunately, the check engine light is still on. He read the code, said it was the fuel cap (code indicated low emissions leakage, so he immediately said it must be the fuel cap, so I bought a new one and he cleared the code and he replaced the fuel cap). However, after replacing the fuel cap, the light would go off for a while then come back on again after normal driving (usually by second day
– Check engine light