Dead O2 sensor

[Ludis Langens]

A neighbor has a 5.0 TBI (L03) in his classic car.  A few weeks ago, he
drove to Mexico.  Several times, he had to fill up with high sulfur
Mexican gas.  On the way back, the fuel economy had dropped 20%.  I
hooked up a scan tool - the ECM had set a code 13.  A short test drive
confirmed the code 13 - the O2 sensor voltage never left a range of four
AtoD converter values centered at the sensor bias voltage.  This sensor
was _dead_.  After putting in a new sensor, the ECM and engine were once
again happy.

Question, did the Mexican gas poison the sensor?  Or might it have died
due to other causes?

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/

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