How to reset check engine light on 2003 sunfire

Try resetting the check engine light by disconnecting the battery for a few minutes (While the battery is disconnected turn your key on and off a few times and run through some switches on the dashboard to drain out any remaining power that might still be in the system). If your vehicle is equipped with a backup power source for memory purposes it could take a bit longer. Reconnect your battery and everything should be reset as far as warning lights. If the check engine light comes back on i would say you have an unrelated issue.

Best to scann or reset but good to check what is going on.

if engine light is flashing it is not firing on all cylinders. a scanner will tell you what cylinders are misfiring. could be plugs. coil or other problem

Problem is at idle only ? How's it drive at highway speed ? Lack power ? Random misfire , vacuum leak ,

CHECK YOUR COOLANT LEVEL THERE IS A SENSOR THAT SENDS A TROUBLE CODE WHEN IT GETS BELOW A CERTAIN LEVEL.

The check engine light (yellow light) comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system u will seldom feel the car engine run any different, there are about 200 possible faults that turn the 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.

my pontic sunfire 2003 engin light is all the time .what can i do about it

i have a pontic sunfire 2003 and check engin light is on all the time

Are you reset the other store codes after to new O2 replace?

Try it and tell us news.

HI. please remove the negative battery post before you being this repair. Make sure you have depressurized the tank as well.

Replace the negative battery post after you have finished the sending unit repair.

The cpu will automatically reset once the negative battery post is reattached and the engine fuel pressure builds back up to its normal pressure.

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