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SVT Shelby GT500
P0139 CEL code?
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<blockquote data-quote="VNMOUS1" data-source="post: 15011616" data-attributes="member: 36794"><p>It's because your front HEGO isn't reaching the prescribed temperature in the set amount of time. </p><p></p><p>It happens frequently with headers. </p><p></p><p>The stainless steel of headers doesn't get as hot nor does it heat up as quickly as stock manifolds. So, the system sees it as though part of your emissions system isn't ready to work. On many years it means the system won't go into closed loop fueling in the "correct" time frame. </p><p></p><p>e85 runs much cooler and exacerbates the problem. </p><p></p><p>The time frame can be extended in the calibration but that's not a guarantee that it won't come back (it will, as the O2s degrade more quickly from the ethanol)</p></blockquote><p></p>
[QUOTE="VNMOUS1, post: 15011616, member: 36794"] It's because your front HEGO isn't reaching the prescribed temperature in the set amount of time. It happens frequently with headers. The stainless steel of headers doesn't get as hot nor does it heat up as quickly as stock manifolds. So, the system sees it as though part of your emissions system isn't ready to work. On many years it means the system won't go into closed loop fueling in the "correct" time frame. e85 runs much cooler and exacerbates the problem. The time frame can be extended in the calibration but that's not a guarantee that it won't come back (it will, as the O2s degrade more quickly from the ethanol) [/QUOTE]
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SVT Shelby GT500
P0139 CEL code?
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