It relates to and O2 sensor heater circuit failure. The ECU measures resistance through the heater wire, and if it breaks it will produce that code. Dirty or corroded contacts can also cause the fault.
cant its the computer
unpluge & repluge the negative terminal of yr battery.
Trouble code P0420 means:Catalyst system efficiency below threshold
Trouble code P1259 means: VTEC SYSTEM B1 FAILURE
Trouble code P1281 means: Cooling System Performance
EGR Circuit (Faulty system operation)
Trouble code P0174 means: System too lean (Bank 2)
Trouble code P0507 means:Idle control system RPM higher than expected
Trouble code P0700 means:Transmission control system malfunction
Evaporative Emission Control System Vent Control Circuit Malfunction
Trouble code P0420 means:Catalyst system efficiency below threshold
Trouble code P0174 means: System too lean (Bank 2)