The
Front O2 sensor(s) on a later model Toyota Tundra is really called an
Air Fuel Ratio sensor. It usually develops a heater circuit failure
around 90K miles or later. This ToY fit those parameters & the
check engine light was on.
Why
did it fail? Read on..
Simple
comparison…
How
long does an average incandescent light bulb last? If you stuffed it
into your exhaust subjecting it to extreme heat and vibration it wouldn't last 10 minutes.
Now
take a heat emitting element & enclose it in metal. In this
scenario you’re the computer and you Command it to get real hot,
real fast. How long will it last? Environment determines life span
and this is a harsh environment. Temps range between 600 to 900
degrees Fahrenheit, not including that it’s getting splashed with
water. A good reason light bulb elements aren't used and you just
learned something!
Repair
on vehicle!
Since
the AFR Sensor failed it needs replacement, but look, there are
serious side affects you discover upon removal. All the threads are
mushed over or as some would say; stripped.
What to do!? Do you
replace the exhaust manifold to get new threads or do you chase those
old threads and regain 70% or more.
I
did the “chase-the-threads” thing as an experiment and this
customer was lucky. Fewer problems seem to defeat the experienced
technician, special tools help as well.
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