Interesting bulletin regarding O2 + exhaust

[Shannen Durphey]

Found this GM bulletin tonight.  There's been discussions in the past regarding
depth of placement of O2 sensors in the exhaust pipe.  Looks like partial
shielding of the element is ok.   Also intersting is that this repair does not
include a different calibration.
Shannen

> ¦The 1993 M/L vans have a larger diameter exhaust crossover pipe which  allows
> ¦for  greater  condensation  in  the  system. Thus there is a chance for water
> ¦droplets to flow down through the exhaust crossover and make contact with the
> ¦Heated  Oxygen  Sensor. The result is thermal cracks inside the sensor element
> ¦and the setting of DTC 44.
> ¦
> ¦CORRECTION:
> ¦----------
> ¦To minimize this condition, a new design  exhaust  crossover  pipe  has  been
> ¦released  for  production  and  service. The new design incorporates a sleeve
> ¦shield around the Heated Oxygen Sensor which eliminates  the  possibility  of
> ¦water droplets coming into contact with the sensor and causing thermal cracks
> ¦inside the sensor element.
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