2002 Toyota Corolla wheel bearing

2002 TOYOTA COROLLA
152,000 MILES • 4 CYL • 2WD • AUTOMATIC
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ROBSTOY
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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
Dec 29, 2008 at 10:39 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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MMPRINCE4000
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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.
Dec 30, 2008 at 6:07 AM
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ROBSTOY
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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
Dec 30, 2008 at 4:33 PM
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MMPRINCE4000
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Upstream measures air/fuel ratio. Downstream measures CAT effeciency. Have your mechanic test both befor you replace them.
Dec 30, 2008 at 10:42 PM