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      09-15-2012, 12:09 PM   #4
ga41
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Drives: Z4 M Coupe
Join Date: Jun 2009
Location: Paphos

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2006 Z4 M Coupe  [0.00]
Much less than 10.000km! The last set (on 98 gas) has lasted longer so far. Symptoms of bad O2 sensors are firstly the Check Engine Light and then bad throttle response, rough rev build up and hesitation and ultimately running very rich. But the latter symptoms occur only if you run it with faulty sensors for a long time. Which I foolishly did the first time it happened because the stupid service supervisor said it wouldn't hurt anything if I did...

The 3rd time they were swapped along with many other things to cure other gradual throttle response and hesitation problems but I cannot be sure which particular part made the difference. I'd also had the ECU reprogrammed to the latest, had the spark plugs replaced, the coils replaced, the injectors professionally cleaned, the catalytic converters replaced (they were indeed destroyed inside though, most probably because of the excessively rich mix the car had been running for a time.) and several sensors manually checked for correct voltages. Eventually the problem was almost completely cured but I cannot know which particular part was the one that fixed it. Maybe it was a combination of some of the above.
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