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well a p0138 is an o2 sensor problem and as for the P0455 the evap system has a very large leak over 40 microns and it may need a fuel cap the P0442 and the P0455 usually go together one is the cause of another

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Q: If you are getting codes PO138 PO455 and PO442 would this be a O2 sensor causing all the problems or an emission leak causing the problems or both?
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