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Audi A3 07 Reg - NO Engine Mgmt Light but Code P0171

Discussion in 'A3/S3/Sportback (8P Chassis)' started by 37, May 14, 2013.

  1. 37
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    37 Member

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    [May 14, 2013]
    Hi guys,
    I was hijacking someone else's thread and the replies I was getting weren't making sense so I thought I might as well start a thread and ask once in for all.

    I recently purchased a stock A3 with absolutely No mods at all and everything is absolutely fine with the car. I took it to one of these free health checks. They said everything is fine but the OBD came up with error Code P0171. The guys there said it best to change this sensor, which I now believe is the O2 Lambda sensor. The car runs absolutely fine, there is nothing unusual. Although I wastold that the mpg might be affected because of this. I managed 225 miles in half tank around London, which I think is pretty good.

    My question is if there is no engine management light and the OBD came up with that error, how would I know it is an error for sure? I wouldn't have known about the error if the guy had ran the OBD and would have been driving normally. I think the light does come on when I switch on ignition and then goes off, like other lights do when you switch on ignition, so in other words its not been disconnected or anything.

    Moving on, if it is an error indeed and I wanted to get it changed, is this what I will need? I was told it is an O2 Lambda sensor and this is what I can match. Also, how would I know about this error in the future? I mean I don't have an OBD and I can't just pop into garages every now and then just for fun to get my car OBD'd!!

    Where can I locate the MAF to clean that thing? I can't find any videos for A3

    Thanks for all the help.
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  3. Mikemc
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    Mikemc Active Member

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    [May 14, 2013]
    I'd just get it scanned with VCDS before wasting money
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  4. 37
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    37 Member

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    [May 14, 2013]

    Thanks for that Mikemc. Anyone around West London Area with VCDS :blush:

    One thing I should also add is that it does say on the report "Intermittent" which would mean it's not consistent.
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  5. gen.heinz guderian
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    gen.heinz guderian Well-Known Member Regional Rep VCDS Map User

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    [May 14, 2013]
    Have a look on the VCDS users map to see if there is anyone near you who can scan it.
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  6. Sidhu88
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    Sidhu88 Active Member

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    [May 14, 2013]
    What engine do u have? And where r u located?
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  7. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [May 14, 2013]
    could just be an old code
    id clear it off and recan in a few days see if it comes back
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  8. RedDejavu
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    RedDejavu Well-Known Member

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    [May 14, 2013]
    was fitted with a **** air intake by previous owner and potencially remaped etc
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  9. 37
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    37 Member

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    [May 15, 2013]
    Thanks for replies chaps. Sidhu88; I've a 1.6 Petrol. Pl check PM.

    The car has Full Audi Service History right from the start so I wouldn't imagine that would be the case but the intake could have gone !!
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  10. RedDejavu
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    RedDejavu Well-Known Member

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    [May 15, 2013]
    could be loose piping after MAF section or you need to check if MAF sits in properly. Good to check cam follower too.
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  11. 37
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    37 Member

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    [May 15, 2013]
    Pardon the ignorance but with only 3 weeks with my first Audi - I can't locate the MAF ..
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  12. 37
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    37 Member

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    [May 18, 2013]
    Hi guys,
    Thanks to Ash187's help, I've now got the log.

    Could someone please let me know if it is indeed the O2 lambda sensor that I would need to change? If yes, where/how do I find the part number. If not your input would be appreciated.

    Please bear in mind that there is No engine management light on and there isn't anything wrong/alarming with the car when I am driving it around. Funny enough, it says Fuel level too low at the end when I've got half a tank of Fuel.

    Cheers

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  13. 37
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    37 Member

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    [May 19, 2013]
    erm - anyone chaps? :/
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