2000 Mitsubishi Galant CODE P0420/P0420

Tiny
MYSWEETX5
  • MEMBER
  • 2000 MITSUBISHI GALANT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 160,022 MILES
THIS CODE IS THE ONLY ONE THAT KEEPS APPEARING PENDING TWICE IN MY CAR, NOW IT MAKES A LOUD FUNNY VIBRATION NOISE WHEN YOU FIRST PRESS THE GAS PEDAL AND AS YOU GO, THE NOISE DISAPPEAR LIGHTLY. BUT NOW I WONDER SHOULD I REPLACE THE WHOLE BAR MUFFLER OR WHICH PART FROM THE CATALYST CONVERTER.
Friday, August 20th, 2010 AT 7:50 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
P0420= catalyst low efficiency, this means it's probably time for a new cat and O2 sensors, 160,000 is over the useful 100,000 miles on the O2's, check the cat for melted or broken up bed, this could be the cause of your rattles, pieces of the cat are stuck in your muffler or pipes, you may need to replace the entire system cat and all!
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Friday, August 20th, 2010 AT 8:54 AM

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