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Service light on

Tiny
ROBERTB
  • MEMBER
  • INFINITI
I have a 2000 I30 Infinity, 51,000 miles. The service light is on and the trouble code is PO420, I have cleared the code, but the light comes back on. I understand the code is for catalst system efficiency below thresold (bank 1). What should I do or check first. I do most of the mechanicial work on my cars.
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Tuesday, December 19th, 2006 AT 1:43 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
If the downstream sensor from the cat is good, it will need a new cat
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Tuesday, December 19th, 2006 AT 3:17 PM
Tiny
ROBERTB
  • MEMBER
  • 4 POSTS
How do I check if the sensor is bad. I have cleared the code and the light goes out for a few days but then comes back.
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Tuesday, December 19th, 2006 AT 5:41 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
An O2 sensor would definitly be the least expensive of the two.I would replace the sensor just to eliminate it as a possibility
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Wednesday, December 20th, 2006 AT 7:30 AM

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