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OPR EGR Vacuum Modulator (98-04 V8; 01-04 V6)

AmericanMuscle no longer carries the OPR EGR Vacuum Modulator (98-04 V8; 01-04 V6). Please check out 1999-2004 Mustang Valves, Sensors and Sending Units for an updated selection.
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  • Item 100989

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    Features & Details

    • Exhaust Gas Recirculation Vacuum Modulator
    • Direct Fit Replacement
    • Ford Motor Company Equivalent Part# F63Z9J459AA
    • Sold Individually
    • Fits 1998 to 2004 V8 & 2001-2004 V6 Mustangs
    Improve Performance. Is your Mustang suffering from poor acceleration, rough idle or failing emissions testing? Then you may need to replace your old stock EGR Vacuum Modulator with a brand new replacement from OPR.

    Reduce Emissions. The EGR (Exhaust Gas Recirculation) system recirculates a portion of your exhaust gases back into your engines combustion chamber to more efficiently and completely burn the fuel to reduce your Mustangs toxic emissions. In this system the EGR Vacuum Modulator uses exhaust backpressure to precisely control (or modulate) the strength of the vacuum sent to the EGR valve.

    OEM Quality. Made to the original factory specifications from OEM quality materials, this OPR EGR Vacuum Modulator is a perfect fit replacement that provides reliable maintenance-free operation.

    Application. This OPR EGR Vacuum Modulator is a direct fit replacement for 1998 to 2004 4.6L V8 Mustangs, including the GT, Bullitt, Mach 1 and SVT Cobra models, as well as 2001-2004 3.8L and 3.9L V6 Mustangs.


    Fitment: 1998 1999 2000 2001 2002 2003 2004 Details

    MPN# 100989

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) EGR Vacuum Modulator
    Installation Info
    Tech Specs
    Will it fit my Mustang?

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        Questions & Answers (1)

        1 Top Rated Question

        Why is this sensor not listed for use with 2000 V6 mustangs? I checked under my hood and the sensors look identical in terms of both ports and the plug in?

        • The connection point for the OPR EGR Vacuum Modulator on the 99-00 V6 Mustangs do happen to be slightly different than the 01-04 versions. It is this reason that this modulator would not work for a 2000 V6.

        Helpful (0)
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          Customer Reviews (12) Write a Review

          Overall Rating 2.8

          out of 5 stars

          • 1/5

            November 19, 2018

            Doesn’t fit!

            Didnt fit ! Just go to your local autopart store its about the same price.


            Year: 2001 Submodel: V6

            Helpful (8)

          • 1/5

            June 04, 2018

            Elec connector too small

            Stop selling from this mfg.....the elec connector would not snap into place. Ran like it had a monster cam....tried to push it on further while running and it gave me an elec shock/burn. Bought an American made one and no problem. Waiting on return authorization.


            Year: 2004 Submodel: GT

            Helpful (12)

          • 1/5

            November 14, 2017


            Installed part as soon as I turned the car on It started bogging engine down . I installed the old one it was back to normal


            Year: 2003 Submodel: Mach 1

            Helpful (15)

          • 1/5

            October 17, 2017

            Faulty part Made issue worse!

            The check engine light turned on, P1443. So I bought this part, thinking it could solve the problem. I was wrong. As soon as I started the motor with this part installed, it surged BIG time. I put the original one back on and it went back to the way is was before. I checked twice with the OPR product, it failed twice. It turned out being the vapor canister purge solenoid, check engine light turn off. This part failed.


            Year: 1998 Submodel: GT

            Helpful (13)

          • 1/5

            June 12, 2017

            Would give 0 stars if I could

            The part came broken! My car is far worse with that part then with the 14 old stock part! The car is choking out and idling very hard. I got a P0402 code ( exhaust gas recirculation A flow excessive detected). So I called AM and they want me to spend more money to get a shop report so they can exchange it? That's stupid they are gonna say the same thing I did, all the while wasting money. I'm just gonna return the part and shop somewhere else.


            Year: 2003 Submodel: V6

            Helpful (15)

          • 4/5

            April 27, 2017


            Just what i needed. Now my car riding real smooth.. Made a difference as soon as i installed it


            Year: 1999 Submodel: GT

            Helpful (13)

          • 5/5

            April 11, 2017


            Did what I needed it too do.. Great price ..easy to put on. Got my check engine light too stay off..


            Year: 2002 Submodel: GT

            Helpful (12)

          • 5/5

            January 11, 2016

            Good stuff

            Great product. Fits like a glove and got here real quick. I recommend this


            Year: 2003 Submodel: GT PORT CHARLOTTE, FL

            Helpful (13)

          • 1/5

            December 17, 2015

            Faulty out of box

            Ordered to replace broken one had no issues with factory one. Put this one on out of box started to apply the EGR valve bogging the engine down. Got one from the salvage yard no issues.


            Year: 2004 Submodel: GT Orangeburg,sc

            Helpful (14)

          • 5/5

            May 29, 2015


            I've replaced the tps sensor, bbk throttle body and the egr. My stang rides like a stallion now


            Year: 2001 Submodel: GT Monterey Park, CA

            Helpful (13)

          • 5/5

            August 23, 2014


            My car now sounds better than before with the brand new part.


            Year: 2001 Submodel: V6 Houston, TX, USA

            Helpful (11)

          • 4/5

            July 18, 2014

            this was a great part

            This is a great part for your car it really did change the way my car runs


            Year: 2000 Submodel: GT Hobbs, NM, USA

            Helpful (13)

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