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

815

Most likely needs a cat

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

815

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 498 nationwide Ram 1500 listings starting at $3,488.

Postal Code:

Dodge Ram 1500 Experts

  • #1
    Dan Connell
    Reputation
    6,510
  • #2
    pudgybear
    Reputation
    6,380
  • #3
    dandyoun
    Reputation
    5,780
View All

Related Models For Sale

Used Ford F-150
583 Great Deals out of 10,750 listings starting at $3,300
Used Chevrolet Silverado 1500
192 Great Deals out of 9,738 listings starting at $1,700
Used Dodge Ram 2500
5 Great Deals out of 87 listings starting at $1,995
Used GMC Sierra 1500
245 Great Deals out of 9,979 listings starting at $399
Used Toyota Tundra
44 Great Deals out of 1,219 listings starting at $2,500
Used Toyota Tacoma
34 Great Deals out of 1,014 listings starting at $5,999
Used Ford F-250 Super Duty
32 Great Deals out of 795 listings starting at $4,500
Used Nissan Titan
26 Great Deals out of 473 listings starting at $6,495
Used Chevrolet Colorado
17 Great Deals out of 1,792 listings starting at $1,999
Used Dodge Dakota
9 Great Deals out of 149 listings starting at $999
Used Dodge Ram 3500
4 Great Deals out of 70 listings starting at $11,450
Used Chevrolet Silverado 2500HD
8 Great Deals out of 1,144 listings starting at $4,995

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.