This is my first time trying to change one, I have a 91 Accord Coupe EX Auto, Has any body changed the Oxygen Sensors themselves? is it fairtly easy? and how many sensors do we have I beleive there is one by the Headers and one by the Cat? Is this right?

Thanks,
Tschaedle

 

I would first unplug the battery (+) that would just reset the ECU. Then spray the old sensors with WD40 and unscrew them its simple. Trace the line and unplug the old sensor, plug in the new one. Then reconnect your battery (+) back and you should be set.