My 1993 Toyota Previa failed smog the smog tech said it was the cat converter or egr I replaced the cat converter and oxygen sensor both new it still failed at 15 mph meas 1232 checked egr works fine?

check fuel regulator, you might still have to replace the cat and the sensor because they might have been damaged already due to the rich gas check fuel regulator, you might still have to replace the cat and the sensor because they might have been damaged already due to the rich gas