2003 TOYOTA COROLLA ENGINE LIGHT P0420

  • Tiny
  • vaqaskhan
  • 2003 Toyota Corolla

Engine problem
2003 Toyota Corolla 4 cyl Front Wheel Drive Automatic 120000 miles

I have engine light on and diagnostics shows P0420. What to do.

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Wednesday, December 26th, 2007 AT 8:26 PM

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  • Tiny
  • blackop555
  • Expert
  • 10,563 posts

Code for poor catalyst efficency on bank 1

An oxygen sensor is no more good and should be replaced

The engine coolant temperature sensor is not working properly (change it first and see if code comes back)

Damaged exhaust manifold / catalytic converter / exhaust pipe (visually check over, if this and the first 3 come up negative change the converter.

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Friday, December 28th, 2007 AT 9:56 AM

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