trouble code p 1131

superglide57

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says upstream heated o2s sensor ,lean condition. Does anybody have any tips on why this sensor may be reading this condition? Is there a common problem with the 96 conti causing it? Thanks Tony
 
If you stuck your hand into the exhaust stream for as long as it's been in there, it would need replacing too....LOL. All kidding aside, after 15-16 years, things wear out. It a common accurance.
 
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