The code p1780 indicated a fault in the park/neutral position switch. It has either failed or is out of adjustment.
obd2 means on board diagnostics failed not o2 sensor, 1st have to figure out why obd2 failed.
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
== ==
Plug in an OBD2 code reader. You can borrow, rent or purchase an OBD2 code scanner at most auto parts retailers.
The obd2 plug is under the knee board (under the column).
Yes, it is called the OBD2 code list.
There is no OBD2 connector on a 1994 Honda Accord. Your car is not OBD2 compliant. You car is OBD1. Click the link for detailed instructions with photos on how to retrieve the code.
No, you need an OBD2 scanner in order to retrieve the code.
Trouble code P0302 means: Cylinder #2 misfire detected
Trouble code P0101 means:Mass or volume circuit range performance problem
With an OBD2 scan tool.