P0171 & P0173 codes
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Thread: P0171 & P0173 codes

  1. #1
    Join Date
    July 3rd, 2019

    P0171 & P0173 codes

    Hi all,

    I have a 2006 Range Rover Sport 4.2 V8.

    The check engine light is on and giving P0171 (System too lean bank 1) & P0173 (Fuel trim malfunction bank 2).

    I have cleaned the MAF sensor but this has not changed anything.

    Has anybody else experienced this and have any advice?

    Thanks in advance.

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  3. #2
    Join Date
    July 21st, 2011
    Virginia Beach, VA

    Re: P0171 & P0173 codes

    When I had this issue, infrequently, on my 08 RRS/SC, I usually ran a can of good fuel system cleaner (Gumout's best, Lucas, SeaFoam, or BK44).

    Might also check the piping from the MAF sensor to the throttle body for air leaks.
    Cheers, Jim

    2017 Lincoln Continental Select 2.7 AWD; 2013 RRSport HSE, 40000 miles (traded); 2001 Jaguar XJ8L X308 BRG 89000 miles (traded on RRS); 08 RRSport SC (sold); 08 LR 3 (traded); 05 LR 3 4.2 (traded); 04 BMW Z4 sold; 01 XJ8 anthracite (for LR 3); 98 Z3 (traded on Z4); 01 S-type 4.0 V8 (traded on XJ8; 99 323 IC (traded on S-type); 94 Deville traded; 88 325IS sold

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