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O2 sensors S70

do you have a quote for them to change out both O2 sensors from this guy?

Does anyone know if the ECM specifies which O2 sensor is bad when the CEL is lit? I'm trying to understand why they seem to do both sensors. Is it that they're money-grubbing or just necessary? After all, they seem to die anywhere from 55,000 mi. to >130,000....






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