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  • P0171

    Hi, new here, i have code P0171 fuel trim too lean bank 1, have changed o2 sensor, smoke test done and no leaks, breathers are fine and injectors fine, my mechanic is now going to change MAF if this doesn't work we are stumped. I have a 2014 1.8 petrol sri

  • #2
    Hi,

    Can't help with your issue but hopefully someone will be along who can.
    2017 Vauxhall Insignia Grand Sport Sri Nav 1.5 (165ps) Turbo petrol in Lava Red - Keyless entry and start - 18” five spoke alloy wheels - Front fog lights - Tinted rear windows - Aluminium sports pedals - Ambient interior led lighting - Front and rear parking assist - Active emergency braking - Forward collision assist - Front pedestrian alert - Traffic sign recognition - Lane keep assist - Cruise control - Speed warning and limiter - Voice recognition - Bluetooth - Duel zone climate control - Front and rear electric windows - High beam assist - Auto lights - Auto wipers - Wifi hotspot - 8” colour touchscreen Navi 900 with Android Auto, Apple Car Play and DAB

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    • #3
      Fuel filter,vacuum pipes worth checking.Hello btw
      Insignia Elite 16T,Royal Blue non Nav. + added,
      Heko Wind Deflectors,Alloy Pedal Covers.Led full Interior,Polished Alloy Door Pins,Osram Diadem Opel Rear indicator Bulbs,Led Reverse Light Upgrade,Gear Surround Red Leds,Led reg plate lights,Nighteye Fog lamp Bulbs,Osram Night Breaker Laser Cornering Bulbs,Rear Sunblinds,Nextbase 522GW front/rear window cam,upgraded front speakers,SS Exhaust,6000k Xenon Bulbs,Thinkdiag Diagnostic Tool

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      • #4
        Lift off themace and welcome to the insignia uk merrymakers.
        Check PCV , check oil cap for seating correctly ,
        Before changing the MAF get them to clean it with some electrical contact cleaner ,
        Could just be dirty ,
        Also what kind of air filter have you got ?
        It's not one of those ones you clean and oil is it ?
        What's your MPG like ? Has that suffered lately?
        Also get them to unplugg the MAF and see if the symptoms get worse or better .
        And if they are good at diagnostics you can get them to check if there is a good signal from the MAF plug and there is 5v reference with ignition on .
        A live data readout should lead them in a good direction.
        Before they start swapping out parts that may not be the culprit.


        .K.M.P.C.U
        YEEEEEEEEHAAAAAAAAA

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        • #5
          Welcome
          LED interior lights. Chrome mirror caps & door handle covers. LED reverse light bulbs. Pedal box. Atomic Alloys. Steel Structure spare wheel. Boot floor risers. Rear exit exhaust & rear valance. M Y ‘15’ front grille.

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          • #6
            Finally found the problem, purge canister valve was faulty, thanks for the advice

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