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1997 Mercury Mystique Base 4dr Sedan

1997 Mercury Mystique
Trim Info:
Front Wheel Drive, 4 Door Sedan, Compact
24 mpg city / 33 mpg hwy
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April 25, 2009, 5:01 pm

Morgan 
 

Question: How many o2 sensors does my 1999 Mercury Mystique have?

I have found 4 devices on my car that look like o2 sensors. Does my car have 4 of the same exact o2 sensors or does it have an upstream and downstream? When I look for parts on line they say they have upstream and downstream but this doesn't make sense to me because 2 of each sensor are on the same exhaust coming off either side of the manifold. I would really appreciate some help with this.

Thanks,
Morgan


 
 



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