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If the ratio is 1.5 or more or there is no downstream HO2S inversion, the WU-TWC is functioning If the ratio is less than 1.5 , the WU-TWC is not functioning properly. Replace the WU-TWC. Upstream HO2S Graph Line Example Fig. 32: Upstream HO2S Graph Line Example Downstream HO2S Graph Line Example 1 Equation RATIO = 30 inversions (upstream HO2S inversions) divided by 5 inversions (downstream HO2S
2008 Mazda MX-5 Miata Grand Touring 2008 ENGINE PERFORMANCE Emission System - MX-5 Miata
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