HELP--OBDII System Too Lean Bank 1,2

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Author Message   Brian Bonham (Brianbonham) Posted on Sunday, September 01, 2002 - 01:01 am:    I finally got some useable codes from my 99 DII. It just hit 50k and the Service Engine Soon light came on. It threw codes 171 and 174, which are O2 sensor codes. Is it possible both went bad at the same time? Or were they tripped by the mileage? Thanks, Brian