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2002 Toyota Corolla catalyst efficiences below threshold

Tiny
MLSMC
  • MEMBER
  • 2002 TOYOTA COROLLA
Computer problem
2002 Toyota Corolla Automatic 157000 miles

I have this check engine code: catalyst efficiences below threshold
and I am told to put gas treatment in my tank and it may fix the problem. Is this good information?
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Tuesday, December 9th, 2008 AT 8:14 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
It is more than likely a bad O2 senor(s). Especially if they have never been changed.
Before changing them have a backpressure test performed on the CAT to see if it is clogged or partially clogged.
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Tuesday, December 9th, 2008 AT 9:09 AM

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