Trying to identify white plastic part that came off

That’s not a Toyota part number: PP-TD20 is a material marking (for later recycling), and it means that the part is made of polypropylene, with 20% talc powder added as reinforcement. I’m not sure what 983 means.

Yes. If your car is a right-hand drive model, the part appears to be the No. 2 air duct sub-assembly, Toyota part number 87211-47120, now 87211-47121, which attaches to the right (driver’s) side of the air conditioner.

The Repair Manual (more info) says it’s easy to reinstall the part itself (“Engage the 2 claws”), but at least in the published procedure, you have to disassemble most of the instrument panel first. An experienced technician might be able to get the part back in the same way it came out, without hours of labor for disassembly and reassembly, which also carries the risk of causing other trouble.

If you plan to try it yourself, before you spend any time staring up into the underside of the instrument panel, disconnect the negative (–) terminal of the auxiliary (12-volt) battery and wait for at least 90 seconds. Disconnecting the battery de-activates the supplemental restraint system, which reduces the risk of serious injury if the driver side knee airbag were somehow to fire while you’re down there.

 

I found the same part fell down on my Prius as well (RHD). Dear Rob, were you able to figure out the reinstallation. I couldn't sense any issues with AC today. Anything to be mindful untill I have this fixed..

thanks

 

Took a pic of ours (2010), which may help. Camera aiming up at underside of driver's side of dashboard. angled towards the centre of car, It's that white plastic object near centre of pic, pretty sure.


(That’s centre console in lower left corner)