2010 Nissan Altima code P0420

20

Asked by meaghanmairemcnamee Aug 15, 2019 at 05:52 PM about the 2010 Nissan Altima 2.5 S

Question type: Maintenance & Repair

Was driving my car home from work last week and
it popped the Service Engine light on with code
P0420, referencing the catalytic converter. Here is
full description: The Catalytic Converter takes the
exhaust gases left over by the combustion process
and converts those gases to harmless emissions.
The engine control module (PCM) compares the
front and rear oxygen sensors to each other to
determine catalytic converter efficiency. If the input
from the rear oxygen sensor starts to match the
front oxygen sensor, the PCM will set code
P0420.Catalytic converters are covered under
federally mandated 8yr/80,000 mile warranty by
the vehicle's manufacturer. Catalytic converters
usually fail as a result of something else (engine
misfire, internal oil leak, or internal coolant leak)
not being repaired. The original cause of the failure
is usually not covered under warranty.
Wondering what might be a good idea to fix the
issue. Auto dealerships wants $4k to fix it and
come back with a list of other things supposedly
wrong.
The car has less than 100k miles, so not really
looking to replace it quite yet

2 Answers

Your Answer:

CarGurus Experts

  • #1
    Gene Arnett
    Reputation
    3,250
  • #2
    GuruB42YD
    Reputation
    2,380
  • #3
    GuruSY3ZL
    Reputation
    2,190
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Honda Accord
59 Great Deals out of 1,026 listings starting at $2,995
Used Toyota Camry
44 Great Deals out of 1,140 listings starting at $3,900
Used Nissan Maxima
15 Great Deals out of 208 listings starting at $3,995
Used Nissan Sentra
63 Great Deals out of 1,899 listings starting at $2,288
Used Honda Civic
190 Great Deals out of 4,208 listings starting at $2,916
Used Toyota Corolla
137 Great Deals out of 2,258 listings starting at $3,495
Used Chevrolet Malibu
46 Great Deals out of 1,132 listings starting at $2,995
Used Dodge Charger
36 Great Deals out of 983 listings starting at $4,888
Used Hyundai Sonata
51 Great Deals out of 824 listings starting at $3,995
Used Nissan Rogue
127 Great Deals out of 4,950 listings starting at $3,495
Used Hyundai Elantra
143 Great Deals out of 3,056 listings starting at $3,300
Used Kia Optima
12 Great Deals out of 248 listings starting at $4,777
Used Nissan Altima Coupe
5 Great Deals out of 12 listings starting at $4,995
Used Ford Fusion
26 Great Deals out of 440 listings starting at $3,990

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.