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1997 993 Oxygen Sensors

Engine

Vehicle Information: Model: C2S; Year: 1997; Body Type: Coupe; Total Mileage: 89,000;

My uncle was told to clean the O2 sensors in his 993. They said it would get off-the-line faster. Is there a good way to clean them? I just bought my car about 2 years ago and don't know when/if they have ever been cleaned/replaced. Should they be cleaned or do you just wait until they fail and you get a check engine light? Is there any type of anti-seize compund you can use on them to keep them from sticking.

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