"Michael Pardee" <michaeltnull@cybertrails.com> wrote
> I don't recall whether the thread was here or in another
group,
> but at least one poster reported improved throttle
response after replacing
> an O2 sensor. It is easy to assume the "check engine"
light will tell us if
> the O2 sensor is bad, but they apparently can get pretty
"soft" before the
> ECU complains.

Yes, so a number of consumer and other car sites report.
Last year it was enough to persuade me to replace my 150k,
13-year-old O2 sensor pre-emptively. (That it was only about
$45 for an OEM one helped, too.)