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On the Carrera, if you spent not a whole lot of money and replaced the O2 sensor, the reference sensors (can use BMW parts for those, around $70 each), the cylinder head temp sensor and the DME relay, you will have taken care of 80% of the things that cause running issues. That would be a few hundred dollars in parts.
If you add in the general "tune up" parts, i.e., plugs, cap and rotor, air and fuel filters, valve adjust (again, not much $ for those parts), you are very likely to have a car that will run reliably for many more years.
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