2001 Hyundai Elantra error code PO422

2001 HYUNDAI ELANTRA
104,578 MILES • 4 CYL • FWD • MANUAL
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JRW3150
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  • 3 POSTS
main cat is below eff. threshold (bank 1)

does this mean I have to replace the cat that comes

off the exhaust header or the one in the rear before

the muffler.
Oct 8, 2008 at 9:22 AM
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2CARPRO JACK
  • ✓ASE Certified Mechanic
  • 11,533 POSTS
  • ASE Certified Mechanic
The one closest to teh exhaust manifold is most likely a pre-cat. If the one before the muffler has the second o2 sensor behind it, that is the main cat and it is most likely the one that needs to be replaced
Oct 8, 2008 at 4:24 PM
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