2002 Toyota Corolla 02 sensor

2002 TOYOTA COROLLA
16,000 MILES • 4 CYL • 2WD • AUTOMATIC
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DANHOWE
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  • 1 POST
160,000 The engine light has been on over a year with no discernable difficulties. Toyota computer said it was the o2 sensor. Changed the sensor and the light is still on. Another dealer suggested it was the catalytic converter.

So what is it? And what to do? And does it matter if the car is running well.
Jan 3, 2009 at 9:26 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
Have the PCM scanned at most autoparts stores for free, see what error codes you have.

The O2 sensor could have partially clogged the CAT, have a backpressure test performed.
Jan 6, 2009 at 9:57 AM
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