Just out of curiosity.... does having an updated EGR valve in the EGR circuit allow for better exhaust gas flow? I’m wondering if (all things being equal) a Prius with an updated valve would require as frequent or as early egr circuit cleaning? Anecdotally, it seems like going beyond 120K miles on a 2010 Prius before cleaning egr is probably pushing it. Would the same be true on a later model 3rd gen?
Well I could be mistaken.... I thought Toyota had done some kind of TSB on the egr? I thought it was for the valve....
Here's the number on the valve of mine, build-date August 2009: And huh: there is a new part number, and this is if I enter model year 2010: Egr Valve - Toyota (25620-37120) Egr Valve - Toyota (25620-37120) | Toyota Parts (In the comments it says replaces 25620-37110) Doesn't really clarify why the revision, what the diff is.
There's some mention of the two valves here: Anyone got check engine light P0401 EGR shows up in every few weeks... | PriusChat Also a Toyota (pdf) bulletin for the valve replacement is linked. At the bottom of that is an instruction for modifying a cable. I'm not sure but it seems like the purpose of the mod is just to give the cable a little more reach. Assuming this cable connects to the valve, maybe this means the valve housing is a little taller? I googled images for the new valve, and here's a pic with the new one on the right, mine on the left. I would say the new one is a little taller? Note also, in the pic of mine, I believe I've reinstalled the bit at the top reversed, that's why it's angling off to the "northwest", vs "northeast" in the new valve pic (on the right). I think I recall doing this; when you try to install back on the engine it obviously doesn't fit, you fix the orientation.
Yeah, I think that's why the pdf (in the link) shows the mod to the wiring harness: to give it a bit more reach. What that length increase accomplishes isn't clear. Googling the difference (between the two part numbers) doesn't give any interesting results. I'd be interested to know, but not $200+ interested, the retail cost of the replacement valve. I'm guessing they're trying to make it flow a bit better??
A couple of in-place pics, you can see the object of the wiring harness mod, which kinda confirms the new valve sticks out further. A screen grab from the pdf in the link:
Lots of good information and documentation - thanks Mendel. Yeah.... I was mostly interested in tapping the collective knowledge of Priuschat as to whether anyone knows/believes there’s been any improvement to the EGR circuit performance as a result of this valve change.
Mendel comes through again. I vote we make him Prius Chat member of the month. Seriously good find Mendel.
