P0441 code After doing maintenance?

P0441 is part of the evaporative emissions system. Could be just the fuel cap not on tight. Or a vacuum hose?
I just got a Prius, and now 2 error codes P0441 P0455... | PriusChat

 

Check the o ring on the gas cap. They have been known to fail a time or 2.

The code of for a gross vacuum leak so I would look for a vacuum hose not attached. Most likely culprit is the PCV hose.

Good luck and keep us posted .

 

reset the code and see if it comes back

 

If it's a false alarm it should go off in 5 or 6 start ups. Check everything's connected, but it should have lit up right away if that was the cause: MAF sensor for example?

 

Where in San Francisco you located (or are you in the Bay Area)?

Seems like you’ve been battling your Prius after this maintenance a bit.

I’ve got techstream and could help you out, if you head my way.

Good luck and keep us posted .

 

There's gas tank tubing running into the intake manifold at the bottom.

 

I had the same problem, a month ago I cleaned the IM & it's components, including the PCV, and 3 months ago I changed ALL the coils and spark plugs, then it threw the p0441, so this week I cleaned the egr & cooler. Reset the code and within 40 miles it gave me 4 codes:
P0302, P0304, P0401, and P0441...

Is it possible that I didn't connect something or maybe didn't tighten down a bolt properly?

Why would the 2 & 4 cylinders misfire after I cleaned the egr & cooler

 

Evap purge solenoid disconnected?

Pixel XL ?

 

Possibly the EGR channels in the intake manifold are plugged in cylinders 1 and 3 diverting all the EGR into 2 & 4?

Pixel XL ?

 

That's an interesting point.
Luckily I don't have to drive my car everyday since I work from home so I have it apart again with the cooler and the EGR off. The plunger on the EGR I had no movement and so i r e cleaned it and use some WD-40 on the plunger with little movement after the fact. I'm going to just order a used cooler and EGR valve clean those up and install those and hopefully that will fix all of the problems.

It's only been a few months since I cleaned my intake manifold but I figure since I'm now just cleaning the EGR that I should just go back through it while I have everything apart. So in the next couple days I'm going to plan on doing that.

I read somewhere on here that Toyota telling us to use the new Denso iridiyam TT spark plugs so I used those when I replace my spark plugs a couple months ago. Maybe it's possible that those wore out faster because I didn't clean the EGR system and they're different from stock? I'm not sure but I also read on this forum that the gaps might be off when they come in the box and that someone use the Bosch plugs because the Gap was closer to what the manual says it should be.

Has anybody else tried different kinds of spark plugs in their car?

 

I had misfiring when I used denso plugs but since I use NGK plugs the misfiring is gone