danielblade3

Seat Mii Jerking with Engine Light On

I'm having some issues with my 2014 Seat Mii gasoline. The engine light is on, and it's jerking when accelerating. I also hear a whistling noise and a loud hissing when accelerating. Sometimes the engine even stalls at idle. MPG has gone up and feels like reduced engine power. Could this be a faulty boost pressure sensor, maybe a defective cable or plug connection? Anyone else had this? Planning to get it checked soon.

4 comment(s)

Whoa, sounds familiar! I had almost the exact same symptoms in my Mii. Engine light on, jerking, the hissing... I bet it's a boost leak somewhere. Have you checked the turbocharger hoses for cracks or loose connections? Mine was doing the same thing, and a simple hose clamp tightening fixed it for me. Is the check engine light still on?

Thanks for the suggestion! Where exactly did you find the boost leak? Was it obvious, or did you have to really search for it? And you are sure yours was a gasoline engine Mii, right?

Yep, gasoline engine Mii. The hissing gave it away instantly; that's definitely a boost leak. Mine was a slightly loose hose on the turbocharger intercooler. The garage should be able to check the boost sensor and all the vacuum lines quickly. Might save you some time and headache. Definitely take it in!

It was the boost pressure sensor cable. The garage replaced the plug, and the engine light is gone. Runs like new now. Total cost was 95€. Thanks for the help!

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