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Old 07-17-2013, 11:35 AM   #4
jb92563
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Join Date: Apr 2012
Location: Riverside, CA
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Quote:
Originally Posted by sfoster13 View Post
Getting these two codes:

PO139 - Fault Code 17 - Sensor ageing behind cat converter cylinder (1-3)
PO140 - Fault Code 12 - O2 sensor behind cat converter cylinder (4-6)

Car is a 2002 S

Nothing about the cat itself?
When the CAT starts to fail you will get its own code saying that its not efficient any more or something like that.
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