99 ALTIMA EXHAUST MANIFOLD FAILURE P0420

  • Tiny
  • balajid
  • Nissan Altima

Hello sir,
My 99 Altima GLE @77600 miles has "Service engine soon" light on, the code is P0420. My dealer replaced Oxygen sensor twice but the light would go off then but will come back again after a couple of days.
Then a Firestone mechanic found "Exhaust manifod/Catalytic converter" failure. He says its actually catalytic cnvrt. That has failed, but need to replace the whole exhaust manifold assembly.

Iam confused now, difference b/w Catalytic converter and exhaust manifold. Also a website says exhaust parts like Catalytic converter is covered by Nissan for 8 years/80,000 miles. Does this mean exhaust manifold is not covered. Can you please clarify.

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Sunday, March 5th, 2006 AT 10:54 PM

1 Reply

  • Tiny
  • fisherman
  • Member

I dont know about the warranty, but when the cat. Converter fails sometimes breaks into pieces and "plugs" the muffler and also overheats the exhaust manifold.
Get a second opinion on it.

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Monday, March 6th, 2006 AT 3:24 PM

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