Thread: Turbo models with 4 O2 sensors?
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Old 05-15-2008, 04:39 AM   #2 (permalink)
alottaboost
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Default Re: Turbo models with 4 O2 sensors?
it uses the rear o2's to determine if the catalytic converters are working properly. it's on all 96+ cars (OBD2 diagnostics). it's just for emissions control
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