Thread: Another code P0171 and P0174 thread (3.0) - ugh!
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Old 09-29-2018, 11:22 PM
cn90 cn90 is offline
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It is usually the CCV return hose to dipstick. Fix it then do the "BavarianE39 CCV Mod" to reduce oil consumption.

Another culprit is the Intake Rubber Boot.
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1998 E39 528i 5sp MT
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