Driving with FE in mind, hard on emissions system?

[Chris D.]

Just got my first CEL @ 116K..

I hook my scanner up and it states a code 0420..
It defines that as "Catalyst system efficiency below threshold (bank 1)"

bank one meaning the upstream (first) 02 sensor?

I replaced that at around 90K and its a factory brand direct fitment..
hell, I even replaced the effeciency sensor as well (downstream o2)

Does Hypermiling = harsh on the emission equipment?
i know its just maitenance stuff possibly, but I donno, thought it mite be worth asking..

I think from the time a vehicle is purchased, theres what, an automatic
5 or 7 years warranty for emissions equipment or what?

[roflwaffle]

Didya check all these? I will say one thing, I've heard that in open loop, Toyota's run notoriously rich, which may result in a fouled Oxygen sensor. After I leaned out the AFM cog on the Camry the CEL, which corresponded to the rear bank oxygen sensor, turned off on a long hill climb and hasn't come back on for a few thousand miles.

[Chris D.]

mite be where my exhaust meets the exhaust manifold..

I have 1 stud out of 3 holding it in place..
Toyota cross threaded the fukkers from the getgo..

I dont want to dick with drilling and tapping, so i'm just going to roll
getteo extreme and hit harbor freight up for a cheap pair of vise grips

[roflwaffle]

That could do it.

[diesel_john]

that happens to me alot, exhaust manifold bolts
sometimes if there is room for a nut, i drill on through.

[Chris D.]

I mite just do that..
the one with the snapped stud is accessable quite easily..
then 2 would be better than 1 (or a vise grip) lol