Coolant detected in exhaust

How many miles since the bypass? Can you see the mod?

 

The burnt toast smell is probably grease monkey hand prints on your hot exhaust manifold or the disconnected coolant hose touching a hot exhaust surface; because they didn't properly tie it back.
It sounds like they disconnected the coolant hoses at the engine, rather than down by the CAT. So until the coolant hoses empty out, you'll continue to blow white smoke.
Keep checking your coolant levels; in case they FUBAR'ed the bypass and you've got leaks.

 

Yes, your correct. Now that the coolant is gone;some exhaust gas is pushing thru the hole, moving up and exhausting out those hoses against your firewall - directly below your fresh air intake.

 

I just started having the same issues last week. Our local mechanic, told me about the service bulletin, and said to take it to the dealer. I dropped it off this morning. I didn’t mention the bulletin, but, I bought the car new there, and have free service \ oil changes for life there. I am awaiting their diagnosis. I am in California, and should be covered from what I have read, or at least I hope.
Our local mechanic suggested if they say it’s not covered, make noise with corporate, the BBB, small claims court., ect.

 

Welcome Dennis

Basic emission warranty is 8 years or 80K mikes; but that's a known recall issue. Get a hold of the TSB to see if the warranty period has been extended; if your over the 80K mile threshold. The reason your exhaust gas heat exchanger is part of the emission warranty is because it's part of the catalytic converter assembly. Currently; you can't simply cut it out and weld another in.

good luck...

 

It's part of the front exhaust pipe assembly; it is behind both catalytic converters.

It's an emissions component in its own right; by helping the engine warm up faster, it shortens the time when the cold engine makes more emissions.

 

Hi Dennis!
We figured it out!
Here are the notes from the Technician:
EXHAUST PIPE GAS CONTROL ACTUATOR SUB-ASSEMBLY damaged, leaking coolant into the catalytic converter.

After he removed the Converter coolant started pouring out damaging the Catalytic Converter. The car will need a new one and I believe I can get that covered for you. Reply STOP to opt out.


Received this text this afternoon. The dealer will submit a warranty claim. They said it could take a month to get a replacement. They will inquire about a rental car, but he said he’s not sure what they will or won’t include.

 

Ask the dealer if they are willing to by-pass the heat exchange; to get you on the road. Being in a rental car for at least a month, on your own dime, may get expensive. BTW the retail cost of that job is north of 2K.

It doesn't hurt to ask; better if they will provide a free loaner

Good Luck...

 

My mother is 86, puts about 1k miles on her car per year. With very minimal effort, we can share her car if needed. I feel a rental should be included. My real worry is repairs covered, and fixed correctly the first time.

 

It's a very simple repair; one exhaust gasket, R & R coolant lines - once the part arrives.

I would check coolant levels, at least once a week, once you get the car back - for at least a month. I'm assuming the gas engine will be running and your not on battery power the entire time. Many dealers rush the coolant burping process, and many here have found low coolant levels after a repair. If you have an exhaust leak, you'll hear either a puffing sound or a mild skreach, like air leaking from a balloon. Honestly, the dealer mechanic should catch this, before releasing the car. Also listen for weird rattles, scraping and tapping going over speed bumps, that wasn't there before, in case the mechanic missed an exhaust strap or hanger.

Good Luck....

 

Hi. Like the Professor, I’m based in the UK and have a 2017 Prius Excel with fewer than 60k miles.
I have the same issue - complained to Toyota, citing the US service bulletin but they have washed their hands of it - it’s not covered by warranty and unprepared to fix the issue unless I pay £1500.

I’m interested in whether anyone else in the UK has the same issue as I got nowhere, The more people reporting the problem ought to convince Toyota UK that this is not just a problem for the US.
I’ll escalate to head office and see how it goes…

 

Yes, your exhaust gas heat exchanger is slowly peeling apart. Since there's no coolant in there; the hot exhaust gases is dismantling the internal heating fins - so some rattling is to be expected. This too should pass; it'll eventually exit out your exhaust pipe.