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2.8L Duramax Problem


hsurles

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Just purchased a 2016 Colorado with the 2.8L Duramax. Vehicle has ~ 1300 miles on it. Check Engine light came on at ~600 miles. Went to dealer and diagnostics found two "failed" sensors....EGT4 sensor (temp) and NOX1 sensor (oxygen). Both were replaced. At ~1300 miles check engine light came on again. New diagnostic shows failed O2 sensor again. They want the vehicle now for an extended "analysis". Any ideas out there? Thanks.

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