That's what I WAS thinking, that it was missing the element -- but now I'm not so sure. I guess I'll stop by Toyota and see what the part actually looks like for the Prius. Seems like on new MAP sensors, it is missing for Prius (so mine may be OK) but on other Toyota vehicles using the same MAP part package, an element/bulb is in there inside the cage.
You may not call me for your wedding photos, but you might call me if your "just married" vehicle breaks down on side of road?
Yeah there should be a little gizmo in the cage, looks like a resistor. I might be able to dig up a pic. They're not cheap btw, well over $200 (US).
Check it out... Fits 2010-2013 Toyota Prius MAP Sensor Denso 47542XC 2011 2012 1.8L 4 Cyl | eBay (for those clicking the link a year later when this ebay auction is long gone, it depicts a NEW 2010-2013 MAP sensor without an element inside the cage)
At 16 minutes in, NutsAboutBolts removes the MAP sensor. You only get a few frames to see inside the cage, but it looks empty here too... @NutzAboutBolts
I couldn't find a pic with the sensor in view, but pretty sure this is the back, with numbers. One hole is for hold-down bolt, the other for register pin: 89421-52010
"Part Number "89421-52010" was found for Toyota, but we could not verify the part fits the selected vehicle." Probably fits Highlander though... and that part number definitely has the element in it.
I will stop at Toyota on lunch (soon) and snap a pic of the new part (if they can even figure out what it's called on the 2010)
Rock auto shows a sensor with the resistor wire in place, but it says up to 10-2009, the sensor for 11-2009 and up shows no resistor wire. So the plot thickens so they say. LoL
I know that my 2010 has the element, but when I went to reassemble our 2012 I was shocked to see the element missing. I did a similar image search and figured maybe this was an updated version. So I just put that MAP sensor back in the 2012 and it has been running fine.
From cleaning this MAP sensor at the shop, I noticed there are at least 2 different versions for the 2010 - 2015 Toyota Prius. Worse one that I dealt with occurred when the resistor was clogged up with oil gunk and I had to take a small tool to clean it out iPhone ?
UPDATE: NEVERMIND THE MAP DISCUSSIONS... It was the magnet and/or spring INSIDE the EGR... I bought EGR and cooler today from some nice guys in Rancho Cordova (Delta One Auto Dismantling 916-701-5911) and only had to use the Magnet, Spring and Cap. Probably could have used the old cap.... Image above is from this video from John Caleb Warren's youtube channel: Long story short the magnet on mine, when wound all the way down, would STICK and not automatically unwind like the "new" one would. So rather than go through the hassle of removing the whole EGR and cooler (which I know are very clean)... I tried replacing just the magnet, spring and cap.... and it WORKED! No more P0401 after more than 35 miles after a reset.
That ones off of recycle road too. That makes three good sources of salvage parts there: HP Motors (they have aisle after aisle of Prii) Benzeen Auto Parts (not as extensive, but they have stock) Delta One Auto Dismantling (pretty sure they were Green Earth Auto Dismantling) Glad you got it sorted.
An update to the update... I was curious exactly how the magnet thing had failed, so I played with the failed one a bit more, lubricated the bearings, tried a bunch of things. I'm pretty sure what happens is the plastic THREADS inside the magnet get damaged and allow the magnet to "jump" off track of the threads and screw on farther than it should allow, which allows the magnet to get tight enough to where it does not automatically unwind itself. TLDR: plastic threads inside magnet get stripped. If you want to go to dismantler prius EGR, you now know what to test to make sure the EGR works -- not just the plunger/valve, but also open it up and make sure the magnet unwinds on its own and doesn't get stuck.
You can get to that nut with a SnapOn 1/4 drive with a wabbly extension. You don't need to remove the wiper assembly. When I cleaned my egr circuit I loosened and removed everything I could easily access before removing the wiper assembly. That egr cooler was clogged and should have been removed and cleaned. He could have used either carb or brake cleaner to clean and loosen the egr valve. Then he only needed to replace the magnet, if that was bad.
