where are the o2 sensors

Asked by Sep 15, 2017 at 07:56 PM about the Mercury Grand Marquis

Question type: Maintenance & Repair

1 Answer

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Depends on the year of the vehicle, some have 2 sensors (upstream) others have 4 sensors, (2 upstream and 2 downstream) upstream sensors will be located in front of the catalytic converters, downstream will be located behind the catalytic converters.

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