03 dodge 1500 O2 sensor

Asked by Jun 27, 2017 at 03:52 PM about the 2003 Dodge Ram 1500 Laramie Quad Cab SB 4WD

Question type: Maintenance & Repair

My truck would load up on gas when you sit at an
idel for a little while. Had the check engine light ran
and it thrower code P0420. Changed the upstream
O2 sensor out and it ran great for about 3 days.
Now my light is back on it it's throwing the same
code. Is there something else that could be wrong
to make it read that?

3 Answers

875

Most likely needs a cat

The sensor is before the cat. With that still cause it to read wrong

875

There should. Be 2 sensors one before the cat and one after, the first one controls fuel and the second one checks the efficiency of the cat by compairing the reading of the upper one to the lower one, if the difference is out of limit it will throw the p0420 code for the cat efficiency

1 of 1 people found this helpful.

Your Answer

Ram 1500

Looking for a Used Ram 1500 in your area?

CarGurus has 10,624 nationwide Ram 1500 listings starting at $1,950.

ZIP:

Dodge Ram 1500 Experts

  • #1
    Dan Connell
    Reputation
    6,770
  • #2
    pudgybear
    Reputation
    6,550
  • #3
    dandyoun
    Reputation
    6,000
View All

Related Models For Sale

Used Ford F-150
2,999 Great Deals out of 231,245 listings starting at $1,300
Used Chevrolet Silverado 1500
2,664 Great Deals out of 158,108 listings starting at $1,850
Used Dodge Ram 2500
162 Great Deals out of 5,403 listings starting at $2,999
Used GMC Sierra 1500
1,097 Great Deals out of 61,964 listings starting at $1,295
Used Toyota Tundra
622 Great Deals out of 36,161 listings starting at $1,500
Used Toyota Tacoma
557 Great Deals out of 41,052 listings starting at $2,995
Used Ford F-250 Super Duty
403 Great Deals out of 47,817 listings starting at $1,700
Used Nissan Titan
334 Great Deals out of 22,037 listings starting at $1,995
Used Dodge Dakota
76 Great Deals out of 3,437 listings starting at $1,475
Used Chevrolet Colorado
329 Great Deals out of 43,489 listings starting at $1,695
Used Ford Mustang
342 Great Deals out of 41,798 listings starting at $1,488
Used Dodge Ram 3500
70 Great Deals out of 2,265 listings starting at $5,950

Used Cars For Sale

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.