Noise coming from under the hood intermittently

Jotowers · Mar 5, 2026 at 6:57 PM

https://photos.app.goo.gl/P7HVWZVdPFse9o3B7

ChapmanF said: ↑

You can see this recent post for the reason the condition that produces a floppy-disk hunting sound is a different failure that doesn't match the detection condition for P1121. You won't see P1121 unless the valve eventually also fails in the way P1121 detects.

If you can stand there and listen to the hunting failure with your own ears, it isn't necessary to wait for any code to tell you what you're hearing.
Click to expand...

Jotowers · Mar 5, 2026 at 6:57 PM

bisco said: ↑

What sound?
Maybe a pump
Click to expand...

https://photos.app.goo.gl/P7HVWZVdPFse9o3B7

Jotowers · Mar 5, 2026 at 7:02 PM

JC91006 said: ↑

This failure should produce a check engine light, as the emissions system is affected. This is not anything that's an emergency, your car will drive fine. You might have an issue of not getting HEAT when you want it, but if you're in Fresno CA, it probably wouldn't be an issue.

You should confirm the failure, it should produce code P1121
Click to expand...

The heater works, I see coolant moving as well. This is what it does occasionally https://photos.app.goo.gl/KY2saUddZ4Age5qx9

Jotowers · Mar 5, 2026 at 7:03 PM

PriusCamper said: ↑

Looks like you made more than 5 comments and they're approved so your free to post links... I watched your Google Photos video but it wasn't a noise I could hear. Can you describe the noise?
Click to expand...

https://photos.app.goo.gl/P7HVWZVdPFse9o3B7
https://photos.app.goo.gl/KY2saUddZ4Age5qx9

Noise coming from under the hood intermittently

Jotowers New Member

Jotowers New Member

Jotowers New Member

Jotowers New Member

About PriusChat

Quick Navigation

Like us on Facebook

Buy us a beer!

Useful Searches

Noise coming from under the hood intermittently

Jotowers New Member

Jotowers New Member

Jotowers New Member

Jotowers New Member