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Message: <blockquote data-quote="a1awind" data-source="post: 1438436" data-attributes="member: 575886">car info: 1996 Buick Roadmaster wagon, lt1 v8 85k milesproblem: service engine light  comes on when climbing a longer grade.....(though it will do it when starting and stopping on short hills  when cold) ...it seemed to have happened when put on my K&N cold air kit.  the code i have is 0174 which means lean condition bank two. the way i know it happens on hills is i borrowed a reader off a friend and clear it out when it comes on,  and it always happens on top of a hill!  Allied auto parts says O2 sensors, 1 mechanic says pcv valve, K&N said clean my Maf,....im confused...and replacing sensors at random is expesive work!</blockquote>