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codes p2202 & p2203

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my truck has set these codes and my mileage has dropped

Vehicle: 2013 Chev 3500 6.6

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P2202 NOx 1 sensor circuit low voltage

P2203 NOx 1 sensor circuit high voltage

The code here point to the same sensor, and usually when you set a code for the same sensor , the fix in majority of replace the sensor, also be aware that this year make vehicle may have a ECM recall.

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