missfire, esp,engine and service warning lights

Hello,
i have a 2.0lt petrol turbo grande espace and have a few issues.
Engine miss fire or limp mode. i have checked the spark plugs and that there is a spark at each plug, no issue there.
ABS and ESP warning lights on, found the metal retaining clip on O/S/F had corroded. i managed to secure the sensor back in place and ABS light has gone off.
Recently replaced battery as original not holding charge. Alternator ok as it would charge old battery.
I have no more ideas, apart from taking it to a garage. anyone had similar problems and any suggestions welcome.

Thanks

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missfire, esp,engine and service warning lights