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2004 BMW 325i Question: what is code P0171 and P0174



weedkill, Lighthouse Point, FL, June 08, 2012, 18:59

CODE P0171 and P0174

3 Answers
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  • Answer #1

    TowerAuto from Tower Automotive Repair LLC, June 08, 2012, 21:26

    P0171 means the Bank 1 oxygen sensor is showing a lean condition
    P0174 means the Bank 2 oxygen sensor is showing a lean condition

    I would inspect the PCV system and the Air intake system for leaks

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    stelidan, July 28, 2014, 11:37

    I had the same problem with the SES light coming on, failing a smoke check, and then the car would not start after I filled up with gas. I took it to a station and will get a possible problem result later today. They were thinking possible fuel pump failure. could that be the problem also, or just a system leak, or cracked intake hose near the engine?

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  • Answer #2

    Greg's Orange Auto (15216 Answers) , Orange, CA - (714) 361-9386
    globalhelper June 08, 2012, 21:54

    have a smoke test done to look for vac leaks but could be a bad mass air flow also

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  • Answer #3

    July 10, 2012, 15:39

    Just had the same problem with my 2004 BMW 325i. Service Engine Soon was on as well. Mechanic said everything seemed fine but then found that a hose (intake) was cracked near engine. Replace hose for$15 and $86 for the time. Runs great now. SES light off. Codes off.

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