02 sensors on a 2004 Mercury Grand Marquis

Asked by Oct 10, 2015 at 10:25 PM about the 2004 Mercury Grand Marquis

Question type: Maintenance & Repair

How many are there? 2 or 4? The dealership is trying to tell me there's only 3.
Doesn't make any sense to me.

1 Answer

73,845

The dealer is correct. There's 3. One is the upstream oxygen sensor and the other two are the downstream oxygen sensors. You have 2 catalytic converters. That's why there's 2 downstream oxygen sensors. HTH. -Jim

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