Evap System, 2003 Buick Century, PO446 , Engine light on

SOURCE: service engine soon light/security light

Probably the dealer will reset the system it for free.

SOURCE: 2003 Buick Century Custom and the Service Engine Soon Light

You will need to have a reputable mechanic do a diagnostic check on the car to determine the problem. This should pull up a code number in your car's computer and help point the mechanic and you in the direction of the malfunctioning part/s.

Just today, I had a diagnostic check done on mine for nearly $45.00. The mechanic was able to figure out the reason why my service engine light was staying on. I knew my car's radiator fans failed to run when car's engine was hot except when the A/C was running. I had changed out the sensors and was never able to get the light to go out or get the fans working. They were able to determine that the 25 amp fuse for the fans located under the hood was blown. After replacing it, the fans worked as they should, my car runs cooler and the engine service engine light is now out. Of course there are many possible reasons why the service engine light may come on including problems with the car's emissions. A reputable mechanic can solve your problem.

SOURCE: I have a 2002 Century Buick. My service engine

EGR valve sticking.

SOURCE: Buick Century 2003 service engine soon light

My service engine light was caused by a cloged passage from my EGR valve. Mine is a 3.1 with fuel injection 2003. All I needed to do was pull the two bolts over the intake plenum and remove the vacuum connection to the PCV valve. Then clean out the EGR port just below the vacuum connection in the throttle port. I would remove the rubber intake to vacuum it out. The carbon was like rock in there. Service engine light cleared on its own.
Dave

ZJ Limited

• 17989 Answers
• Posted on Jul 01, 2010

SOURCE: 2003 Buick Century Sevice Engine light

A check engine light doesn’t always mean a big problem or an expensive repair is ahead. However, driving a car with the check engine light on could mean that you are doing further damage to the engine, depending on the problem. It’s always best to get the vehicle checked at your earliest convenience.

Because there are so many possible reasons for the check engine light to come on, pulling the codes for the event can be helpful when the problem is not immediately evident. Even if the check engine light is only on a short time, a code will be stored in the ECU for later retrieval.

I suggest scannin your ECU to know which fault code there.

Hope helps (remember rated this).