Another hose question

What's the filter-looking thingy just next to the oil fill neck and how often does it need replacing?

Thanks,

 

"Vacuum surge tank", for your VVTi V8 it should be 25719-AC010. I've never heard of it dying on anyone.

Remind us what the codes are again?

 

Since you asked…

I posted previously the exhaust system on my new-to-me ’07 Sequoia is a crime scene, with aftermarket cats and the downtubes welded to the exhaust manifolds.

I was fighting with P0174, P0420, and P0430 codes. I did most of the things you suggested in another post. I put in new spark plugs (which I would have done anyway), cleaned the MAF and throttle body, replaced the PCV valve and the hose to the valve, replaced the hose from the air box to the regulator on the passenger side, and did a couple of other things. The P0174 seemed conquered, but not the 420/430, so I tried this on the passenger side downstream sensor…

https://www.youtube.com/watch?v=qHD7T7EhuzI

That’s not the only video/article I viewed (there are many), and I went through all the comments and such. I’m pretty sure I did it right. However, I got a P0158, O2 sensor circuit high voltage, and a P0606, ECM/PCM processor fault.

I replaced the modified sensor, which I believe is a generic Bosch (as is the driver’s side sensor), with a direct fit Denso, and when I started her up the CEL came on immediately. The P0174 is back, but no 420 or 430. And, fortunately, no P0606.

The upstream passenger side sensor is marked Denso Toyota. I suppose it could be the original. I bought a direct fit Denso to replace it, but haven’t had either the time or the weather to do so. I'm not sure what else I can do short of replacing the entire exhaust system, including the manifolds.

Comments welcome.