ludwig_hofmann10

Seat Mii Engine Troubles After Fuel Filter Change

I'm pulling my hair out here! My 2021 Seat Mii with a gasoline engine is giving me grief. It's got 75754 km on the clock, and suddenly the check engine light is mocking me. The engine stalls at idle sometimes, and there's a noticeable lack of oomph. Could a defective fuel pressure regulator cause all this? The error popped up right after I changed the fuel filter myself... coincidence, I think not! Is it possible to somehow damage the fuel pressure regulator during fuel filter replacement?

4 comment(s)

Whoa, sounds familiar! I had a similar experience with my Mii, though my mileage wasn't quite as high. Check engine light, rough idle, the whole shebang. Was there any noticeable pressure drop when it happened? Did you observe the fuel efficiency decreasing?

Pressure drop, you say? I didn't specifically measure it, but the rough idle and power loss definitely felt like something was off. How did you diagnose the pressure drop? Did you connect a pressure sensor or something?

Yep, that sounds exactly like what I went through. If the check engine light came on right after changing the fuel filter, it's highly likely the pressure regulator. In my case, the fuel efficiency took a nosedive too. Better have a workshop take a look!

Appreciate the insight! Turns out you were spot on – it was the fuel pressure regulator throwing a hissy fit. After a quick trip to the garage and 45€ lighter, the Mii is purring like a kitten again. They cleared the error code that popped up after I messed with the fuel filter, and bingo, check engine light is gone!

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