ray o

Checked the factory repair manual for a 97 Avalon, DTC P0411 is not listed.

"secondary air injection system" implies something with the exhaust so I'd
look for a valve that is hanging up or a leaking tube.

Good luck!
--
Ray O
correct the return address punctuation to reply

j strickland

Thanks Ray.

My kid's friend drives an Audi A4 (that she has totally trashed out, it's a
shame that she'd treat her car so badly but that's another rant ...).

I was thinking the Secondary Injection System was something akin to the
Pulse Air System on my old Jeep, where they pump fresh air into the exhaust
stream to give any unburned fuel something to work with when it gets to the
CAT. Combustion requires air, fuel, and ignition, I assume the exhaust
stream provides the fuel, the CAT provides the heat, and the secondary air
injectors provide the air. This is just an educated guess, feel free to
straighten me out.

ray o

Like I mentioned before, the 97 Avalon doesn't use a secondary air injection
system so the factory repair manual doesn't list the trouble code, possible
causes, or things to check.

No combustion actually occurs in the catylitic converter. A catalyst is
something that can make something else change without itself getting
affected or used up in the process. Heat is a by-product, which is why the
cat gets so hot.

I have no experience with a secondary air injection system so I don't really
know what its purpose is. If it is introducing air into the exhaust stream
I'm guessing its function i ssimilar to an EGR valve's.


--
Ray O
correct the return address punctuation to reply

ray o

Checked the factory repair manual for a 97 Avalon, DTC P0411 is not listed.

"secondary air injection system" implies something with the exhaust so I'd
look for a valve that is hanging up or a leaking tube.

Good luck!
--
Ray O
correct the return address punctuation to reply

j strickland

Thanks Ray.

My kid's friend drives an Audi A4 (that she has totally trashed out, it's a
shame that she'd treat her car so badly but that's another rant ...).

I was thinking the Secondary Injection System was something akin to the
Pulse Air System on my old Jeep, where they pump fresh air into the exhaust
stream to give any unburned fuel something to work with when it gets to the
CAT. Combustion requires air, fuel, and ignition, I assume the exhaust
stream provides the fuel, the CAT provides the heat, and the secondary air
injectors provide the air. This is just an educated guess, feel free to
straighten me out.

ray o

Like I mentioned before, the 97 Avalon doesn't use a secondary air injection
system so the factory repair manual doesn't list the trouble code, possible
causes, or things to check.

No combustion actually occurs in the catylitic converter. A catalyst is
something that can make something else change without itself getting
affected or used up in the process. Heat is a by-product, which is why the
cat gets so hot.

I have no experience with a secondary air injection system so I don't really
know what its purpose is. If it is introducing air into the exhaust stream
I'm guessing its function i ssimilar to an EGR valve's.


--
Ray O
correct the return address punctuation to reply