Can a p0138 code be caused by a bad upstream o2 sensor? P0456 wrangler jeep evap P0137 jeep p0138 has substance cable looks similar
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P0123 error code
Jeep wrangler p0456: evap system – small leak
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Codes p0137 and p0138
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Jeep wrangler p0304: cylinder 4 .
