Question about 2000 Ford Focus

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Check engine on when scan code 171 comes out

I pass by the railroad tracks i wasn't speeding but the railroad tracks hit the bottom of my car and my front mirrow fell then later the check engine turn on i took it with my friend the mechanic he checked it with the machine and the code something 171 comes out it also says something about fuel system too lean or low so my friend ask me what kind of gas i put I said the cheapest one so he suggest to put the more expensive and that will make it ok but the next day the check engine turn on again checked it again and the same code came out . I don't know what to do now or what can i do please help me.

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  • smith14511 Oct 26, 2008

    P0171 code after hitting curb in medium strip.

  • Jordan Ratliff
    Jordan Ratliff Mar 03, 2009

    mine is an 07 , we fixed one problem the car couldn't idle for more than 10 min it would start dying, and have to be push started, and have to go about 60 for 20 minutes before it would work right, alternator. but it still says its running lean, and i have never dealt with this kind of thing or such a new car any ideas are helpful. I love my car she's a cheetah on steroids:), also the meat machine i wonder if my hitting a deer has anything to do with all this, body guy said everything was fine under the hood even thought he had to replace radiatior, fan and something to do with the ac.



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On your problem with your Focus.
The code P0171 mean Fuel system to lean.
But this code is involved on a Lots of causes.
I will call a few of them, Starting with the more important.

1--- Any VACCUM LEAK. First check the PCV Valve. and hose.
2--- Air leaking On the Hose from the Throttle Body to the Air filter cleaner.
Air filter and Fuel filter Damaged.
3--- Vaccum Leak on the Intake manifold hoses.
4---- Low or High Fuel pressure.
5--- Low Fuel Octane.
6---- Bad Spark plugs and wires.
7---- MAFF sensor defective.
8--- Exhaust system Restricted.
9---- Oxigen sensor below thresshold.

ok... Remember the First is the Vaccum LEAK..

I hope this help on your problem
Thank you for use fixya....

7----- Fuel Contaminated.

Posted on Oct 11, 2008

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I would seriously look at your exhaust and particuarly the engine pipe to the muffler. It sounds awfully like both cases have crushed that pipe on the railway tracks or the curbing and have therefore restricted the exhaust, thus the check engine light is now on, because the motor is now running too lean.

I wouldn't think the price of the petrol you are using would have a lot of bearing on that particular problem, however it could lead to other problems with the fuel system later if it is contaminated or of a lower octane rating that advised

Hope it works out OK

Posted on Oct 28, 2008

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My daughter experienced the same problem after hitting a medium strip curb. Could the extreme shock be relevant?

Posted on Oct 26, 2008

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