Will the MIL be illuminated on a Toyota after the sensor replacement is the sensors have not transmitted to the ecu?

Yes, the Malfunction Indicator Light (MIL) may remain illuminated on a Toyota even after replacing the sensors if the new sensors have not successfully transmitted data to the Engine Control Unit (ECU). This could indicate that there is still a communication issue or that the ECU is not receiving the correct signals. It’s important to check for any additional fault codes and ensure that the sensors are properly connected and functioning. A diagnostic scan may be necessary to resolve the issue.