How do you reset a computer for a 2001 buick century for a check engine light. New computer 1 yr ago

How To Reset the Service Engine Soon Light in a 1999 Buick...

1. Put the key into the ignition and turn it to "Run." Don't start the engine.
2. Press down slowly and fully on the gas pedal, then release it. Do this three times in five seconds.
3. Watch for the "Service Engine Soon" light to start blinking. This indicates that the system is resetting itself. ...
4. Start the Century's engine

P0304 is engine misfire #4 cylinder Several things can cause a misfire #1 electrical which you have covered #2 Mechanical Test engine compression is should be around 150 cranking and 120 running . internal valve train components can cause bad compression and the valves then self. #3 fuel injector can be the cause suggest swapping with a know good cylinder and see if misfire follows injector.

flav96
Check:
Fuses
Wiring ( only if U installed yourself )
Go online to Buick Century

You can find the procedure to reset the light here

https://resetoillight.com/buick/oil-change-light-reset-buick-century-1994-1995-1996-1997-1998-1999-2000-2001-2002-2003-2004/

should be in your owners manual

I just put in new fron pads in my 2000 buick century and the track off and the anti lock brake light and the service engine soon stays on

You could be encountering computer failure. Needs to be looked at.

How to Reset the GM Oil Life System

After changing the engine oil, the system must be reset.
1. With the engine off, turn the ignition key to RUN.
2. Fully push and release the accelerator pedal slowly
three times within five seconds.
If the CHANGE OIL SOON light flashes,
the system is resetting.
3. Turn the key to OFF, then start the vehicle.
The oil life will change to 100 percent.
If the CHANGE OIL SOON light comes back on,
the system has not reset. Repeat the procedure.

Check the fuel filter, it might be clogged.

Must have engine computer scanned to get codes and determine cause of check engine light. Low tire light probably needs reset. Open passenger door and remove panel on side of dash. Reset switch should be located in that compartment.