Emission light came on
SOURCE: how ton replace alternator in a 2007 ford focus
you did not state which engine you have but if you are not real handy and/or have experience this is not one you should tackle as your first alternator because...
all will require that you either drop the rear of the subframe or rotate the engine forward to remove the alternator.
everything else is the same...remove the belt, unbolt and remove
about an hour job with experience and two hours if a first time
SOURCE: 2007 ford focus emission light on rough idol
The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause. When the Check Engine light is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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