Question

P1121 Honda - WHERE IS IT LOCATED ON THE CAR AND HOW CAN I FIX IT

Answer 1

P1121 is for the throttle postion sensor, which might be dirty along with the throttle body.

clean both parts with throttle body cleaner and disconnect both battery terminals and touch them together for 30min to clear the ECM put everything back and start the car and let it idle for 15min dont drive it or anything