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I have a 94 F150 5.0. The check engine light is on. Since its an older car it can't be read with an electronic diagnostic test, how can it be checked. I know with some older cars u can turn the ignition key forward n backwards a certain number of times to make the check engine light flash. The number of times it flashed could be used to help locate a particular problem. Can this trick be used? If so, what is the correct way? If not, then what? Thanks
 

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The pre OBDII (on board diagnostics 2), sometimes referred to as OBDI, can be triggered by a small jumper cable or a paper clip. A scanner with a FORD specific cable can also be used to read the codes. Note that a code indicates that the computer is not getting the signal it is programmed to expect from a given sensor, The code is a diagnostic tool, not a solution to the problem. You have to determine why the computer is not getting the signal, e.g. volts, ohms, etc, it is expecting. Is the wire connection corroded? Is the wire shorted or broken (open)? Is the sensor bad? Do not just assume that the code means you have a bad sensor.
 
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