Question about 2003 Ford Crown Victoria

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My engine light is on and sometimes flashes. I'm 99% sure it it the passenger side cat convert, performance is down, shudders, fuel cosumption is up and one exhust is cooler that the other. I've also been told that there is a way to show the codes by turning the key a certain way or a certain number of times. Is this true and if so how do I do it.

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  • Matthew Lepine
    Matthew Lepine May 11, 2010

    The only way you are going to figure out whats wrong with your vehicle is to hook up a OBD II Scanner and read the codes. Also you stated that the check engine light flashes, which means that the engine has a misfire.



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Sounds like a misfire. take your car to the auto parts and have the hook up their obd II scanner . if its is a misfire check the plugs olso meke sure there is no water. i own a 98 vic with a misfire it was water and turns out my intake manifold need it to be replace. iif not check the coil. good luck

Posted on Apr 28, 2009


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Also if you want to test the catalytic converter before you replace it. To do this remove the Oxygen Sensor thats located after the converter and hook up a pressure gauge to the whole and check for pressure. If there is any pressure build up then your system is clogged after the converter, either in the exhaust pipes on in the muffler.

If there is no pressure build up reinstall the O2 sensor and remove the O2 sensor before the catalytic converter. Insert a pressure gauge in the whole and if there is pressure build up then replace the converter, if there is no pressure build up then the exhaust system seems fine.

Posted on Apr 23, 2009


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