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The dealer told me I have a bad 02 sensor in one side of the exhaust. As far as I can tell, It has performs just find. Should I spend the 235.00 and fix it? Or should I wait until there is a performance issue? The Check Engine light goes on and off occasionally. It now has been on for 3 days.

Thanks for you help
 

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White Diamond '03 DHS (with DTS floor shift)
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The Check Engine light goes on and off occasionally.
Pull the codes. Most likely there will be an O2 sensor code. You may never feel a performance issue.
 
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