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If a check engine light is flashing that means an engine cylinder misfire has been detected
how to check fuse for horn in a 1998 Pontiac sunfire
cant you need a scanner to check codes from 1996 and newer
Unhook battery cables (both) for about 5-10 minutes. Then rehook. This may reset the system. If problem persists, then the CEL will come back on.
The check engine light has nothing to do with an oil change. The check engine light is reset with a scan tool after repairing the failure that caused it.
it probably needs an O2 sensor they range from about 40-90 dollars
Reset with an OBD2 scan tool, after the repair of whatever triggered the light.
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camshaft sensor - signal low could be that or check the wiring to it. Other possibilities MAF or TPS
check if your battery is low than usual ..might be alternator problem
after the cause of the code is repaired, you reset with a scan tool, or by unhooking the battery.
You mileage will vary dependent on the condition of your car, your driving habits and which engine/transmission you have. Check the web site below for exact specs. http://consumerguideauto.howstuffworks.com/1995-to-2005-pontiac-sunfire-6.htm