I have 1994 Toyota Pick Up 4 cylinder 2.4 Liters. Fail NOx and I also notices that Nox cut point to low. At 15 mph MAX 386 PPM and at 25 mph 564 ppm. Why state changes the cut point to low comparing to 2002 Honda Civic at 15 mph MAX 477 and 25 mph MAX at 764 p... Login to read more.