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The BMW Range
5 Series
E39
Need Review from E39 SIFU'S for this 520i-2003 E39
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<blockquote data-quote="aidilj" data-source="post: 663858" data-attributes="member: 20536"><p>Yes, the pre cat O2 sensor is the one that controls your fuel trim. A bad sensor can cause the engine to run rich, using more fuel that you need to.</p></blockquote><p></p>
[QUOTE="aidilj, post: 663858, member: 20536"] Yes, the pre cat O2 sensor is the one that controls your fuel trim. A bad sensor can cause the engine to run rich, using more fuel that you need to. [/QUOTE]
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The BMW Range
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Need Review from E39 SIFU'S for this 520i-2003 E39
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