Last week my car slide into a ditch full of water. The computer was under water and it messed it up. I got another obd2a ls computer sent to me and the car starts up now but is throwing the codes

P0450 - EVAP Emission Control System Press Sensor Fault
P0453 - EVAP Emission Control System Press Sensor High


Now this car is completely stock and I've never had an integra before. But plent of civics/crxs. Im just not sure where to start troubleshooting because I dont know where these sensors are on the integra. I read a post on civic forum that seemed to state its in the gas tank. Is this true? Also is it possible that the computer I'm using had a sensor that my car didnt have if they were both obd2a integra ls? The car is running ok but its idling high now. Please point me in the right direction. Thanks



Josh.b.austin@gmail.com