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Sometimes removing the positive battery cable for a minute then reconnecting it will reset the codes. If this does not work the Auto Zone can hook it up to the OBD meter for free and read/reset the codes. If your check engine light continues to come on then I would recommend you have the codes read and the problem fixed by your local trusted auto technician.
p1259 is a problem with the VTEC system. this system is for improved performance at higher rpm's. oil can get sludged up and clog the system, or the VTEC solenoid can just go bad. you can always have someone with a scan tool clear the codes to turn off the light, but until the problem is fixed, it will just keep coming back on
I have a 1998 Honda Accord EX. I had the check engine light come on as well and I had the code read by PepBoys. The code was:P1259 or VTEC SYSTEM Malfunction.
I Don't know jack about were to start to fix this problem, so I bit the bullet and took the car to my Honda Dealer. The problem was checked out and was told this.
( REPLACE VTEC VALVE ASSEMBLY)
I had them do the work because I dont know how to do this. So after $204.00 in Labor and $162.29 in parts, for a grand total $366.29, The car was fixed!!!!!!! Run's great and no check engine light on anymore. So to help you out as best I can, here is the numbers that are on my work sheet. I dont know witch numbers represent the part number but this is how it looks on my paper.
There you go! I hope this gives everyone a place to start. maybe get your self a Haynes Repair Manual (#42014 is for the 1998-2002 Honda Accord, all models) and try to do the work your self. Good luck to all of you form Donald M. in SoCal.
P1259 is a code for vtec malfunction usually cause by a bad vtec solenoid, vtec pressure sensor, low oil level, bad connection. Was oil change done? May want to check the oil level. P1166 is a code for a primary o2 sensor 1.