Dead O2 sensor

[David Cooley]

At 12:45 PM 8/28/2000 -0800, you wrote:
>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?


I would suspect the gas did it... Mexican gas has been known to be very 
nasty...  sometimes even having lead.


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