BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > Car starts, misfires then cuts out after 5 seconds
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      09-25-2023, 06:18 PM   #1
ReubenW
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Car starts, misfires then cuts out after 5 seconds

Hi all,

Iím wondering if anyone may have had a similar experience / know where to point me in the right direction.
I have a 2012 BMW M135i,

It has been giving me trouble in recent months, I have been getting a lean fuel mixture error code, but has been running ok.

One day, it had been running on the driveway, and it cut out. It was low on fuel so I filled it up. It started back up, ran for 5 seconds and cut out.

If I try to restart it, it just cranks. If I turn it off, then try start it again it will run for 5 seconds and cut out. In those 5 seconds, it runs lumpy.

I am getting error code 152008: Ignition circuit, voltage supply - cylinder bank or engine failure.

It is really bugging me now, battery is fully charged. I have checked all engine related fuses in engine bay, boot and passenger footwell (FEM). It has had new spark plugs, new coil packs, and a new ignition/injector loom.

Still same fault occurring.

Is there an ignition/fuel injection relay on the F20 135? Although I have tested the supply to each coil and they all get 12v even after it has cut out.

Could it be my DME? Ignition output? How do I test this?

My DME is loaded with Bootmod3.

Could it be injector related even though the code is ignition?

Any other ideas please? I just want it back on the road 🥹
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      09-26-2023, 12:02 PM   #2
ReubenW
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Here is the bootmod3 error codes, any ideas anyone?
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