I have a Honda civic 2003 1.7L with check engine light on
I tried everything (changed all 4 coils and the spark plugs.)
The light is still on and the error code is P1259.
What else I need to fix, can anybody help?

 

Did you try searching?

https://honda-tech.com/forums/honda-civic-2001-2005-78/diagnosing-vtec-code-p1259-2972424/

 

from searching I found this is a common vtec problem with the either the oil pressure switch or solenoid for the vtec.

 

I would start with an oil change, good chance its low oil level.