5 L4-2.3L (2007)
Equation: RATIO = 30 inversions (upstream HO2S inversions) - 5 inversions (downstream HO2S inversions) = 6.0 (good WU-TWC)
Downstream HO2S graph line example 2
Downstream HO2S graph line example 3
Equation: RATIO = 30 inversions (upstream HO2S inversions) - 27 inversions (downstream HO2S inversions) = 1.1 (bad WU-TWC)
