Nates86lxi

Hi I'm trying to find the location of my baro sensor on a 1986 Honda Accord Lxi .I was told it's either in the Ecu or behind the kick panel on the passenger side b.I'm not sure which one I checked my book and I'm getting 13 flashes from the Ecu. And it says is the baro sensor and I don't know if they just sell the sensor or do I have to either get a new ECM could somebody please help me??????