Update:
o <https://i.postimg.cc/QdDv3H7V/obd33.jpg> *a.h.r is 99.9% garbage spam*

Aghast, I happened to use the dejagoogle feature to look at the a.h.r
newsgroup, which, much to my chagrin, is more than 99.9% worthless spam.
o <http://tinyurl.com/alt-home-repair>
o <https://groups.google.com/g/alt.home.repair>

Given the lack of value in a.h.r, I will no longer be posting the results
of this thread to that newsgroup, preferring to put the updates on r.a.t
which, thankfully, isn't almost 100% worthless spam as a.h.r clearly is.

I'll also drop ca.driving, such that this is the only worthwhile ng:
o Request for diagnostic advice to pinpoint least expensive solution
to resolve persistent P0421 OBDII DTC
<https://groups.google.com/g/rec.autos.tech/c/u3mtjAGgwK8>

BTW, the vehicle passed smog today; but that doesn't solve the problem
of diagnostics since it only made it through the intermittent window.
--
We never fail to solve our DIY repairs, working together, for all.