P0420 2006 Nissan Altima

Asked by Jul 10, 2017 at 10:42 AM about the 2006 Nissan Altima 2.5 S

Question type: Maintenance & Repair

Hi,
My check engine light never came on however my
car was having issues accelerating when pressing
the gas. It slowly picks up then catches and drives
perfect. Only when I brake does it take a slow bro
me accelerating again. Any who I got a diagnostic
test done and P0420 came up... NOW MY CHECK
ENGINE LIGHT IS ON. Does this mean I need a
complete new catalytic converter? Or can I use the
fuel injector and clean it out?

2 Answers

1,680

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. Oxygen sensors are also referred to as O2 sensors. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not designed to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail. This is what a P0420 means in simplified terms.

1 of 1 people found this helpful.
1,680

Injector cleaner will not fix this... you more than likely will need to replace the Cat. Could be $200 if you DIY with a universal cat or around $1000 if you get an OEM / Pay for labor

1 of 1 people found this helpful.

Your Answer

Nissan Altima Experts

  • #1
    Tom Demyan
    Reputation
    2,140
  • #2
    putolile
    Reputation
    730
  • #3
    Cassie Sapphire
    Reputation
    700
View All

Related Models For Sale

Used Nissan Maxima
23 Great Deals out of 355 listings starting at $3,990
Used Honda Accord
84 Great Deals out of 1,069 listings starting at $1,200
Used Toyota Camry
60 Great Deals out of 1,938 listings starting at $850
Used Honda Civic
297 Great Deals out of 3,478 listings starting at $995
Used Nissan Sentra
201 Great Deals out of 1,635 listings starting at $1,950
Used Toyota Corolla
189 Great Deals out of 3,747 listings starting at $2,245
Used Hyundai Sonata
52 Great Deals out of 1,394 listings starting at $1,800
Used Chevrolet Malibu
86 Great Deals out of 2,214 listings starting at $2,994
Used Ford Fusion
152 Great Deals out of 2,100 listings starting at $995
Used Dodge Charger
68 Great Deals out of 770 listings starting at $2,000
Used Kia Optima
38 Great Deals out of 866 listings starting at $6,195
Used Chevrolet Impala
124 Great Deals out of 1,037 listings starting at $1,500
Used Hyundai Elantra
188 Great Deals out of 3,421 listings starting at $2,950

Used Cars For Sale

2017 Nissan Altima 2.5 S For Sale
31 listings starting at $17,800
2016 Nissan Altima 2.5 S For Sale
32 listings starting at $14,994
2015 Nissan Altima 2.5 S For Sale
43 listings starting at $13,000
2014 Nissan Altima 2.5 S For Sale
9 listings starting at $11,795
2013 Nissan Altima 2.5 S For Sale
23 listings starting at $8,995

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.