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Thread: Audi A3 Poor Staring & Misfire (any help appreciated)

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  1. Audi A3 Poor Staring & Misfire (any help appreciated) 
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    Hi Guys,

    I have a 2009 Audi A3 1.9TDI, Engine code BLS.

    My car struggles to start, and when it does it misfires and smokes from the exhaust. I had a diagnostic tool plugged into it and it gave me the following fault:

    P0407 - Exhaust recirc. position sensor, signal too low.

    I have replaced the EGR itself an it has made no difference.

    My next thing to check would be wiring to the EGR and the EGR pressure solenoid valve.

    Any help would be greatly appreciated.

    Thanks.

    Rob
     
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  2. Re: Audi A3 Poor Staring & Misfire (any help appreciated) 
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    So you have replaced the EGR valve unit 03G 131 502 B and cleaned the housing?

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  3. Re: Audi A3 Poor Staring & Misfire (any help appreciated) 
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    Quote Originally Posted by Crasher View Post
    So you have replaced the EGR valve unit 03G 131 502 B and cleaned the housing?

    Yeah, thatís right I replaced the full unit.
     
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  4. Re: Audi A3 Poor Staring & Misfire (any help appreciated) 
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    Which make of unit did you fit and do you have the part number off of the box?
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  5. Re: Audi A3 Poor Staring & Misfire (any help appreciated) 
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    It was a Pierburg, brand new and the part number was the same as the one I took off - 03G 131 502.

    Cheers
     
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  6. Re: Audi A3 Poor Staring & Misfire (any help appreciated) 
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    So you are still getting code P0407? I would have expected P0403 instaed.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  7. Re: Audi A3 Poor Staring & Misfire (any help appreciated) 
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    Yeah, still P0407...that's the only code in there.

    Cheers.
     
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  8. Re: Audi A3 Poor Staring & Misfire (any help appreciated) 
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    I looked at the wiring diagram and the known issues folder and there are known problems with the EGR valve but that should give code P0407. The EGR valve is driven directly from the ECU with no separate fused power feed (not a great idea) so you need to use a multimeter and the diagram (I can email this if you need it) to measure the continuity of the wiring from the ECU plug to the EGR valve plug, there are no connectors in the wiring where faults can occur which vastly reduces the potential for a wiring fault but you have to check it. If the wiring is good and the code your reader is showing correct (what are you using) the it comes down to a faulty new valve or faulty ECU which is unlikely but does happen and the design of the valve wiring could lead to a faulty valve damaging the ECU. The ECU plugs are a right sketch to get at.
    Last edited by Crasher; 10-11-2018 at 11:47 PM.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  9. Re: Audi A3 Poor Staring & Misfire (any help appreciated) 
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    Hi thanks for your help, emailing me the diagram would be greatly
    appreciated...I believe the guy who plugged it in used a snap-on code reader.

    roberttaylor1997@hotmail.com

    i will have a look on Sunday and let you know how I get on.


    Thanks a lot.

    Rob
     
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