3 L4-2.3L (2004)
Upstream HO2S graph line example
Downstream HO2S graph line example 1
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)