What year car? How many miles? What symptoms led to this decision? Which one
is said to be malfunctioning?

Meanwhile you can check the site https://www.automedicsupply.com/ for
prices. It has the best I have ever seen for Genunine Honda oxygen sensors.

Do not use aftermarket oxygen sensors.

> wrote
> does that sound a little high? The mechanic suggested I replace both
> even though only one is malfunctioning, is that standard?
>