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Re: LEAN P0171 & P0174
Posted to HD/Fleet Forum on 5/30/2018 2 Replies

Just had an 2012 NPR 6.0L gas came through with lean codes, both permanent and pending. No intake leaks whatsoever. Nonetheless, had massive exhaust leak downstream at exhaust manifold flange to pipe. Replaced the flange gaskets, was able to clear the pending ... Login to read more.

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