Question about 2002 Ford SVT Focus

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Check engine light ford focus

The check engine light came on in my vehicle I had it reset etc and it went off long enough to pass inspection but came back on shortly after passing

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If you go to your local O'reilly's or Auto Zone they will lend you a computer analyzer to run a diagnostic, Run the diagnostic, you will end up with a set of fault codes, make sure you right down all the codes, come back with Year, Make and Model and Fault codes that it shows, and I will be happy to give you some more input

Posted on Apr 13, 2014

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  • saltlakescot
    saltlakescot Apr 14, 2014

    Thank you so much Eric, I will do just that. I didn't know That they offered that type of service at O'reily's. That gives me someplace to start. I haven't owned a vehicle in over 15 yrs and I feel like a kid again. Only this time without my dad to give me sound advice etc...

  •  Eric Justad
    Eric Justad Apr 14, 2014

    glad I could be of help, I understand how tough it can be especially when you loose that one person that you could count on and be there to help out with these thing, I wont give any one any advise that I would not give my own daughter.

  • saltlakescot
    saltlakescot Apr 16, 2014

    so I went to O'Reilly's and the fault code Is PO420. The car is a 2002 ford focus which I am told is either an oxygen sensor or the catalytic converter. Is this something that I need to take care of immediately to prevent further damage? Or is it something that can wait a while. otherwise the car seems to be running fine.

  •  Eric Justad
    Eric Justad Apr 19, 2014

    probably the O2 sensor, if your cat was bad you would have a loss of power. Not a something you need worry about right away, just when evet you get around to it.

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Unless you can say what the code was ...it could be a number of things ...co2 sencor to bad plugs ,bad wire..bad fuel cap ...you say you had it reset well there had to be a code??

Posted on Apr 13, 2014

  • saltlakescot
    saltlakescot Apr 13, 2014

    It was code 419 or 420 I think but am not certain I believe it was an emissions code as he said something about the exhaust manifold

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When this happens (loss of all power or code reset), the computer will run all its tests on all systems, and set a 'ready' condition when the tests are passed. Some tests require multiple 'drive cycles' or specific conditions (less than full tank of gas but more than 1/4 tank) to complete the test. Until all (or a specific number - some non-critical tests may be exempted) tests are 'ready', the car will not be passed. The assumption being that until a test is successfully completed, the computer may discover a problem with a system, one that would fail the smog test.

If you're confident that all problems have been fixed, you need to run through enough drive cycles so the computer can complete all required tests. Most ODBII code readers can also read the readiness of the systems. And most parts stores will read your codes for you (and system status) or let you borrow a reader.

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2003 ford focus 2.0L everytime the key is turned off the emissions systems reset cant get it passed emissions because they keep going incomplete when the car is turned off


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Went to inspection yesterday and my Avalon passed then later that day my engine light came on


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If not, you lucked out and passed your inspection just before a problem cropped up! Use the codes you copied down and get code definitions at the auto parts store. This is the place to start for diagnosing the problem.

Mar 29, 2011 | 2005 Toyota Avalon

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