Where Are The O2 Sensors Located On A 2003 Mercury Marauder

I suspect that a faulty O2 sensor is causing variations in gas mileage.

Why Are Some Wheels Painted Instead Of Polished? Can You Polish The Painted...

Why are some wheels painted and not polished? Can you polish the painted wheels?


Are There Major Appearance Differences Btw A 2003 And 2004 Mercury Marauder...

I'm trying to figure out what year this is? :) Thanks!