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Anyone know the Motorcraft part numbers for oxygen sensors after the cat? 1991 GM

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    #1

    Anyone know the Motorcraft part numbers for oxygen sensors after the cat? 1991 GM

    Hi,
    Does anyone know what the Motorcraft part numbers are for the downstream O2 sensors?
    What length would the wires be?

    This is for a dual exhaust 1991 Grand Marquis.
    Are HO sensors the same part number?

    I thank you again,
    Mike
    90 Colony Park LS with GT 40 heads and intake. HO cam, 65 MM TB, 67 MM EGR spacer. Has a 75 MM Pro Flow mass air sensor. Borla XS mufflers. 3L55. Shift kit, 2000 stall Tq convertor...Bilstein shocks, front and rear sway bars.
    90 Colony Park LS 64,000 miles all original. 3L55 tow package....front and rear sway bars.
    91 Grand Marquis GS....HO motor..Bilstein shocks poly bushings and police swaybars. This one handles the best.
    70 Torino Squire with M code 351 Cleveland 3.00 has Magnaflow mufflers. Hidden headlights and power windows. All original
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    #2
    Downstream o2 sensors? Only sensors you should have are in the manifolds.
    2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
    2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
    2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
    1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIP

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      #3
      when I switched to dual exhaust and mustang headers the muffler shop put the bung holes in after the cats
      90 Colony Park LS with GT 40 heads and intake. HO cam, 65 MM TB, 67 MM EGR spacer. Has a 75 MM Pro Flow mass air sensor. Borla XS mufflers. 3L55. Shift kit, 2000 stall Tq convertor...Bilstein shocks, front and rear sway bars.
      90 Colony Park LS 64,000 miles all original. 3L55 tow package....front and rear sway bars.
      91 Grand Marquis GS....HO motor..Bilstein shocks poly bushings and police swaybars. This one handles the best.
      70 Torino Squire with M code 351 Cleveland 3.00 has Magnaflow mufflers. Hidden headlights and power windows. All original

      Comment

        #4
        fill with plugs then (or old sensors with the wires cut off). Only OBD-II cars (96+) are required to have those or were even equipped in the first place.

        Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
        rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

        Originally posted by gadget73
        ... and it should all work like magic and unicorns and stuff.

        Originally posted by dmccaig
        Overhead, some poor bastards are flying in airplanes.

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          #5
          There is no spoon. The sensors are upstream only. Plug the new holes. If they did not put any upstream have them fix it.

          posting from mah phone. plz to be forgiving bad speeling.
          86 Lincoln Town Car (Galactica).
          5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

          91 Lincoln Mark VII LSC grandpa spec white and cranberry

          1984 Lincoln Continental TurboDiesel - rolls coal

          Originally posted by phayzer5
          I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

          Everything looks like voodoo if you don't understand how it works

          Comment

            #6
            Since you are using the Mustang H-pipe, the 02 sensors should screw in to the original location for the sensors on that pipe. As noted, you do need a longer pigtail to plug in the sensors. when install Mustang H-pipe on my car, I extended the wires on the original sensors, but later learned the Mustang/Mark 7 sensors already come with a longer pigtail.

            The motorcraft part # for the mark7 sensors is DY-606

            If the exhaust shop installed new bungs after the cats for the sensor location, this is 100% wrong. The sensors should be as close to the exhaust manifold as possible. In the manifold is actually better because its more accurate.

            Also make sure the correct side sensor is plugged into the correct side of the harness, there is a left and right and it matters which is which. If you cross them and plug the right harness into the left sensor it will totally screw up your fuel trims. Ask John aka 86VickyLX... he knows all about this.
            2003 Town Car Signature - 3.27 RAR, Dual exhaust and J-mod - SOLD 9/2011
            89 Crown Victoria LX HPP -- SOLD 9/2010
            88 Grand Marquis LS - The Original -- Totaled 5/2006

            I rebuild AOD/AODE/4R70W/4R75E transmissions....Check out my Facebook page: https://www.facebook.com/pages/North...48414635312478

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