Do you have P0401 or P0402 code as well? P 1410 and P1411 usually because of the malfunction of EGR Position sensor. You might measure the resistance of the sensor between the terminals VC and E2. It should be between 1.5-4.3K. If the resistance is not specified, replace the sensor. You need to buy 89455-33020 (I'm assuming you have a 97-01 Es300). 89455-33020 is a new PN replaced for 89455-33010. They are exactly the same.
If your sensor is good, then you might have the trouble. You will need to inspect the ERGvalve, VCV or ECM.