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Bank One, Bank Two

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    Bank One, Bank Two

    On a 2001 4.6 Marquis, which side is which? Thanks.

    #2
    both sides i would guess, sooo both your o2 sensors are shot? i take it
    89 townie, mild exhuast up grades, soon to have loud ass stereo....

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      #3
      driver's side is bank one. I believe this is more or less universal to all V-configuration engines.

      85 4 door 351 Civi Crown Victoria - Summer daily driver, sleeper in the making, and wildly inappropriate autocross machine
      160KMs 600cfm holley, shorty headers, 2.5" catted exhaust, 255/295 tires, cop shocks, cop swaybars, underdrive pulley, 2.73L gears.
      waiting for install: 3.27's, Poly bushings, boxed rear arms, 2500 stall converter, ported e7's, etc

      06 Mazda 3 hatch 2.3L 5AT (winter beater that cost more than my summer car)

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        #4
        bank one is usally on the side that has cyl number one-four. bank two has cyl number five-eight. then if you have 4 sensors, number two sensors are the back sensors. number one sensors are the front sensors. lol

        1981 Mercury Marquis Brougham 2-Door 302/ 5-speed -special blend (GMGT)
        1987 Lincoln Mark VII 5-speed (Errand runner)
        1989 Mercury Grand Marquis (Base Runner)
        2007 Lincoln Town Car Signature Limited (Hustlyn)
        2011 Ford Crown Victoria Police Interceptor (Down with O.P.P)

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          #5
          ----<firewall>----
          <bank1>-<bank2>
          4----------------8
          3----------------7
          2----------------6
          1----------------5
          ----<radiator>----
          -My Homepage, Panther info & FAQs-
          My Mint 96' Mercury Grand Marquis LSE -
          Modifications
          Click My Merc for more Pics!

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            #6
            Thanks! I have a cat low efficiency code for bank 2 and needed to know which side to look at.

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