2001 Hyundai Elantra error code PO422

Tiny
JRW3150
  • MEMBER
  • 2001 HYUNDAI ELANTRA
  • 4 CYL
  • FWD
  • MANUAL
  • 104,578 MILES
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.
Wednesday, October 8th, 2008 AT 9:22 AM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
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
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Wednesday, October 8th, 2008 AT 4:24 PM

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