Dorman 911-609 Exhaust Gas Recirculation (EGR) Vacuum Modulator Compatible with Select Lexus / Subaru / Toyota Models

Works perfect Nice product

Perfect fit for my FJ80. Needed to replace it to pass smog, the OEM was clogged. Worked great & my FJ80 passed smog. I would definitely recommend this product. Easy & cheap fix.

Hi, this item is doing a good job, i'am happy with this Dorman part, good price good company, this is for a 2000 Toyota Camry, thanks

Purchased, installed, Check engine light cleared, passed smog inspection. Been working a month or so now. VERY EASY to install. I walked my daughter through it over the phone.

Passed smog with this with no problem. Old one's filter was clogged causing issues

Was getting P0401 on my '96 Camry 2.2, towards the end it was coming on daily. Watched a few youtube videos and everyone was saying this modulator is the rarest thing to be wrong, usually it's the EGR valve is clogged where it attaches to the manifold. Took it off and it had a little bit of gunk, nothing major. The other thing typically wrong is the VSV, see my review on the APDTY 022715 on how to test that.Bought a vacuum pump / brake bleeder at Harbor Freight (63391) to do troubleshooting, it can both pull a vacuum and act as a vacuum gauge. You'll also want a Dorman 47309 adapter so you can adapt to different size vacuum lines easily.EGR valve diaphragm was fine, no leaks at all. Vacuum test with engine running on Q port of the modulator at 2500 RPM showed nothing. Hooked to the port on the bottom of the modulator and tried to pull a vacuum and couldn't, so figured the diaphragm in it was the problem. With new one could pull/hold a vacuum on that same port. Installed it and P0401 is gone. See youtube video "sRjVDcvUYH8" for other troubleshooting hints.

I switched the VSV along with this to clear the P0401 on a 1997 toyota Rav4. This part is so cheap and easy to replace you should do it anyway if you get an EGR related code. I aso recommend cleaning the throttle body when you replace this since the 2 hoses are connected to 2 endings that always get clogged. Replaced VSV, Mudulator and cleaned the Throttle Body since its got 2 hoses connected to the EGR Modulator and car runs like new.

I was a Toyota tech for a number of years and have seen my share of modulators fail. I have a 1998 Camry 4 cylinder 5SFE motor. My modulator diaphragm was blown. It caused exhaust gasses to enter the “R” port on the throttle body causing the aluminum to corrode, blocking the port. I cleared the port and replaced the modulator with this one and ended up with the car bucking and surging so bad at high speed that the car was misfiring. Riding with my scanner hooked up; the long term fuel trim was reading around -16 to -20, meaning that the car was trying to lean out the fuel to air mixture. This is because too much exhaust is entering the intake.Now for the nitty gritty... The modulator is supposed to be calibrated to effectively control the amount of exhaust gas entering the intake. It's a balance of exhaust back pressure on the modulator diaphragm vs. vacuum from the 2 supply vacuum ports on the modulator. The modulator has 3 vacuum ports on it. the "Q" port is the port that goes to the EGR VSV. The "P" port is the all-time vacuum port from the throttle body. The "R" port is ported vacuum also from the throttle body; it's ported, meaning that it is only active when the throttle plate is at a specific position and the engine RPM is high enough around 2500 for a 4 cylinder 5SFE motor. The VSV is the computer's way of turning the EGR system on or off other than the VSV, the system is basically analog. My car will operate with this modulator installed, but only if the "R" port is disconnected from the modulator.Basically my modulator is allowing far too much flow below the 2500 RPM mark. The modulator should apply low vacuum to the EGR valve at low RPM and low engine load. When the engine is under heavier load (NOT close to full throttle) the modulator will allow more vacuum to go to the EGR valve. My modulator is applying FULL vacuum any time the throttle is cracked even while maintaining speeds between 45-50 MPH, it's worse at 70+ MPH.It's modulating from the “P” port and completely bypassing from the “R” port. My modulator is half-way modulating... :-( Oh, and now you understand more of how the system works.I don't know if this is an assembly problem or if all of these valves are calibrated incorrectly.