service engine light checked. code P0301 - cylinder 1 misfire. help?

[frankiG_]

Had the Check Engine light on past few days. I've had engine hiccups accompanying the light on at idles. Sometimes subtle, sometimes rough and aggressive. When I had the Check Engine light checked today got code P0301 - cylinder 1 misfire. Was told it could be a multitude of things. I know that its more than likely the spark plug(s) and ignition coil(s). Thinking of just replacing all of them. However I was also told it could be the injectors among other things. Has anyone encountered this before on a 2009 128i, or in general and got it resolved? Thinking of getting Bosch coils and plugs. Any recommendations? All help will be appreciated - thanks.

[Dackelone]

First try moving cylinder #1 coil to another cylinder. Then see IF the mis fire code moves to that cylinder.

Of course you could always just replace all your spark plugs and coils too.

[JimD]

If you are close to 50K miles I would replace the plugs. They need to be replaced anyway and it might solve the problem. If that isn't it, then moving components to find what is bad makes sense. The info I googled up indicated it could be injectors. I'd try the plugs, then the coil, then maybe the injector.

[frankiG_]

Would you recommend getting Bosch brand coils and plugs?
As for injectors, know a good site to buy some off of? Might as well change them out too

[Lexington]

Below is a quote from Mike Miller on spark plugs.

Like just about everything else on the modern BMWs, Bosch spark plug choice is complicated and confusing. The short answer is if you order the spark plugs from BMW (sometimes there is a choice between Bosch or NGK), then you are good to go and there is no confusion. But they are expensive.

Savvy enthusiasts have found that Bosch has a part number for commercially-available spark plugs that cross-references to the BMW original equipment Bosch spark plugs, often at a fraction of the price. The problem is, the commercially-available (aftermarket) Bosch spark plugs are not always the same as the original BMW Bosch plugs even though they cross-reference and they do work.

Dealership technicians report problems with the commercially-available Bosch Platinum +4 spark plugs in BMW engines. I have never seen this personally, but physical inspection does reveal differences in insulator design between the original BMW Bosch spark plugs for the modern cars and the commercially-available Bosch Platinum +4.