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2002 Toyota Corolla wheel bearing

Tiny
ROBSTOY
  • MEMBER
  • 2002 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 152,000 MILES
I recently had scanned car when eng light came on;
indicated ineffecient cat-conv; other then poor gas miileage; how can I determine for sure if cat-conv is bad and needs replacing? Whenever it rains and I go thru puddles the car looses power; is this because of cat-conv or O2 sensor? Can you help me Rob
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Monday, December 29th, 2008 AT 10:39 AM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
The problem could be the downstream O2 sensor. You can check the CAT, by having a backpressure test performed.
This is done by removing the downstream O2 sensor, and screwing in a test gauge which will measure backpressure, if high the CAT is clogged or partially clogged. If not, then the downstream O2 sensor needs to be replaced.
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Tuesday, December 30th, 2008 AT 6:07 AM
Tiny
ROBSTOY
  • MEMBER
  • 14 POSTS
To: carpros:
Thanks for answering my question; I had downstream 02 sensor replaced by Meinike in Nov;
it cost me $200; supposedly they did back pressure chek and said convertor is ok; and the car runs the same; felt I have been ripped off. Should the
upstream 02 sensor be change as welll? Rob
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Tuesday, December 30th, 2008 AT 4:33 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Upstream measures air/fuel ratio. Downstream measures CAT effeciency. Have your mechanic test both befor you replace them.
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Tuesday, December 30th, 2008 AT 10:42 PM

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