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2004 silverado getting lean codes for two 02 sensors


wvcoalminer

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Hey guys I'm new here and need a little help I have a 2004 Silverado 5.3 with around 184,000 miles when driving with light load between 40 and50 mph and rpms between 1200 and 1500 the RpMs go down 50 to 100 then right back up it does this constantly while driving in this speed range scanner says to lean on back 1 and bank2 changed one sensor still throwing code and had pcm updated and changed MAF sensor its a headache trying to figure out any help appreciated.

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