"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message

They truly don't fail very often. Most often, it's a false code because
of other un-interpretable symptoms, bad connectors, or a bad harness.

LLoyd

Mine had two problems, accumulated crud on the platinum wires and poor
connection caused by unplugging it too many times to check the air filter
for rodent damage. The connector isolated itself to an intermittent Check
Engine light that cleared after pressing in only that one connector. The
crud wasn't so obvious to the diagnostics but the engine ran smoother after
cleaning it.

jsw