emissions warning light keeps coming on, computer says cylinder 4 missfire, new coils fitted! light comes on, same problem, heated coil pack replaced, light comes on, same problem, help! please! had a brain scan, still same problem!
I have similar problem ... Zafira 1.6i 05.55. You need to replace the Coilpack and the Spark plugs together. The spark plug is more than likely buggered. Vauxhall tend to not take care to adjust their spark plugs when putting them in....this can cause the coilpack to fail.
You need to get the cylinder pressure checked first.....if ok then its not a cylinder issue phewww! in my case.
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