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Code P0420

Tiny
DENISE NICOLE WOODEN
  • MEMBER
  • 2005 NISSAN MAXIMA
  • 167,000 MILES
It is giving a code p0420 and I need to know what it could really be for. Sure I am a single parent and do not have lot money, but I got to get tags on the car and I do not know what to change for sure.
Tuesday, March 14th, 2017 AT 7:01 PM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Most commonly this is due to a failed catalytic converter.
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Tuesday, March 14th, 2017 AT 7:19 PM
Tiny
DENISE NICOLE WOODEN
  • MEMBER
  • 2 POSTS
Is that the same as the o2 part? And would that be the first part I fix to get my check light off? And is it real expensive to get that other part fixed?
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Tuesday, March 14th, 2017 AT 8:12 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hi Denise,

No unfortunately, the catalytic converter is more expensive but and you can find one Amazon.

https://www.amazon.com/gp/product/B0049J8WTE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=2carprcom-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B0049J8WTE&linkId=7310c879f53b538ccf2d64d77169161b

Here is a guide that will help you know what you are in for when changing it out.

https://www.2carpros.com/articles/catalytic-converter-replacement

and when you are done you will need to clear the codes

https://www.2carpros.com/articles/check-engine-light-clear-codes

Please let me know if we can help you further.

Best, Ken
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Wednesday, March 15th, 2017 AT 4:34 PM

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