obd2 means on board diagnostics failed not o2 sensor, 1st have to figure out why obd2 failed.
P1780 Push - Pull Sensor Mal, could you please explain what the push - pull sensor is please?
The code p1780 indicated a fault in the park/neutral position switch. It has either failed or is out of adjustment.
p0030 is ho2 sensor bank 1 sensor 1 heater curcuit
Either us an OBD2 (most auto parts stores have them) or remove the negative battery cable for a few min's. You will need to re-enter the code for your radio though
p1399 is manufacturer control ignition system or missfire, this code could be coils,plugwires, or plugs,
OBD2
It should be OBD2. I think 96-00 civics are all OBD2
OBD2
LOCATION OF OBD2 PORT?
Obd2 stands for on-board diagnostics computer system. Most vehicles today come equipped with OBD2 or OBD3 diagnostic systems.
The fuse for the horn and the OBD2 diagnostic computer is the same n recent FORD and Mercury models. The computer controls the check engine light. So replacing horn fuse is also isturbing the OBD2 computer