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What are the signs of a bad O2 sensor on a 1999 Mercury Cougar?
Wiki User
∙ 13y ago
A bad O2 on this generation Cougar quickly throws a code and trips the check engine light.
If you don't have a light, get it scanned at autozone or such anyways, as the dash lights do burn out from time to time.
Fuel economy does take a bit of a hit with a bad O2, not by much. The worst parts of a bad O2 is that a) you can't tell if you have another code going off, and b) it will likely result in you not passing emissions testing if your state tests.
Wiki User
∙ 13y ago
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