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well, i don't know anything about the foxwell unit, but you should have a code at -9 so perhaps you are reading the wrong value?
otherwise, while these are interference engines (ie, the piston can hit the valve if the timing gets way off) i've run my car at -16 without breaking it. it ran rough and i didn't do it for long (drive to the mechanic) however. if truly at -9 expect to be down on power.
me, i'd (a) confirm the reading, (b) confirm the sensor, (c) determine mechanism behind bad deviation (pads, failed/stuck solenoid, tensioners, etc.) (d) determine cost for repairs, (e) make the call to live with it or fix it. if fix it, realise that tensioner pad replacement is such a standard repair (albeit pricey) that porsche even updated the part for the tensioner pads as the originals failed on such a regular basis. so i'd find a new mechanic.
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