I've had them replaced 3 times so far... The first two times i had the engine light on and it turns out it was the sensors and the last one it wasn't on and i trying to cure a case of bad throttle response at low revs and hesitation with the rev build up. The first two times i believe it was caused by bad fuel. I used to put 100 octane gas from a particular petrol company (EKO, Greek one). Ever since i switched to 98 i didn't have a Check Engine Light again.
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