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Cobra Forums
2013-14 Shelby GT500
P0420, P0430 codes. Check engine light came on and I scanned and came up with those codes.
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<blockquote data-quote="Vinnie_B" data-source="post: 16935367" data-attributes="member: 201678"><p>DTC sets when bank 1/2 catalyst system efficiency is below the acceptable threshold.</p><p></p><p>Possible causes for P0420/P0430 DTC to set:</p><p></p><ul> <li data-xf-list-type="ul">Damaged heated oxygen sensor (HO2S)</li> <li data-xf-list-type="ul">Exhaust leaks</li> <li data-xf-list-type="ul">Damaged exhaust manifold</li> <li data-xf-list-type="ul">Damaged catalytic converter</li> <li data-xf-list-type="ul">Oil contamination</li> <li data-xf-list-type="ul">Cylinder misfiring</li> <li data-xf-list-type="ul">Downstream HO2S wires incorrectly connected</li> <li data-xf-list-type="ul">Damaged exhaust system pipe</li> <li data-xf-list-type="ul">Damaged muffler/tailpipe assembly</li> <li data-xf-list-type="ul">Evaporative emission (EVAP) purge valve stuck open</li> <li data-xf-list-type="ul">Leaking fuel injector</li> </ul><p></p><p></p><p>Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage which reduces the frequency and amplitude of the downstream HO2S as compared with an upstream HO2S signal. As catalyst efficiency deteriorates, its ability to store oxygen declines and the downstream HO2S signal has an increased amplitude and frequency, approaching the amplitude and frequency of the upstream HO2S.</p><p></p><p></p><p>*For vehicles with universal HO2S, the PCM compares the signal line length of the downstream HO2S to an expected signal line length of the downstream HO2S with a deteriorated catalytic converter.</p><p></p><p></p><p>*For all others, the signal line lengths of the downstream HO2S are compared against the signal line lengths of the upstream HO2S.</p></blockquote><p></p>
[QUOTE="Vinnie_B, post: 16935367, member: 201678"] DTC sets when bank 1/2 catalyst system efficiency is below the acceptable threshold. Possible causes for P0420/P0430 DTC to set: [LIST] [*]Damaged heated oxygen sensor (HO2S) [*]Exhaust leaks [*]Damaged exhaust manifold [*]Damaged catalytic converter [*]Oil contamination [*]Cylinder misfiring [*]Downstream HO2S wires incorrectly connected [*]Damaged exhaust system pipe [*]Damaged muffler/tailpipe assembly [*]Evaporative emission (EVAP) purge valve stuck open [*]Leaking fuel injector [/LIST] Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage which reduces the frequency and amplitude of the downstream HO2S as compared with an upstream HO2S signal. As catalyst efficiency deteriorates, its ability to store oxygen declines and the downstream HO2S signal has an increased amplitude and frequency, approaching the amplitude and frequency of the upstream HO2S. *For vehicles with universal HO2S, the PCM compares the signal line length of the downstream HO2S to an expected signal line length of the downstream HO2S with a deteriorated catalytic converter. *For all others, the signal line lengths of the downstream HO2S are compared against the signal line lengths of the upstream HO2S. [/QUOTE]
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2013-14 Shelby GT500
P0420, P0430 codes. Check engine light came on and I scanned and came up with those codes.
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