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1999 Volkswagen Beetle Question: engine starts but stall immediately. fault codes P0171,P0725,P1857 and P1850

 

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negron99, 2.0L 4 Cylinder, Ocala, FL, March 23, 2012, 11:29
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have manual but these particular codes are not listed. I have replaced the fuel filter,fuel pump relay switch and two vacumm lines still have same problem even after reseting computer.

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  • Answer #1

    Miles Auto Services (884 Answers) , Richmond, VA - (804) 885-4176
    milesauto March 23, 2012, 12:14
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    P0171 is a lean air mixture code and P0725 is a engine speed sensor fault. I do not see the other codes in fault code list. You may be getting some bogus codes depending the scanner that gets the code for you. P codes are generic but VW uses codes like 5 digit numbers. Might try clearing codes and retry starting and see what comes back. VW has had a history of mass air sensor failures and the P0171 would relate to that.

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  • Answer #2

    April 16, 2012, 14:58
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    Your spark plugs must be set perfect. If not the vehicle will keep stalling. Check your spark plug wires also they wear out after time.

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