I don't think it's the ECU, absent other codes I don't think the EGR parts are the issue either. Which state are you in? I want to look up your states inspection rules, most allow for one unset monitor. You have no lights on but they work with the bulb test correct? Did you use an OEM Mistu EGR or other?
Try this full drive cycle. This one should run all the tests.
A. Begin from Cold Start. Ensure your fuel tank is between 1/4 and 3/4 full. Engine coolant temperature must be below 122 F and within 11 F of the ambient air temperature with all accessories off.
B. Idle. Run engine for 2 1/2 minutes. Put the vehicle is Drive while holding the brake pedal, and hold for 15 seconds. Put the vehicle in Park and turn the ignition to OFF position. Repeat this step once.
C. Start the vehicle and begin to drive. Apply half throttle until 55 MPH is reached.
D. Hold your speed steady at 55 MPH for five minutes. Coast down to 10 mph do not brake.
E. Accelerate again at 3/4 throttle until 55-60 MPH is reached. Hold steady at 55-60 for 2 minutes. Coast down to 10 MPH do not brake.
Repeat this process 2 times. Not in the same day as you need to start with a cold engine both times. Now see if all the monitors have set.
Wednesday, April 14th, 2021 AT 7:57 AM