the engine light stays on.


Asked by Dec 25, 2012 at 01:53 PM about the 2004 Land Rover Discovery HSE

Question type: Maintenance & Repair

Code points to O2 sensor.  Will this fix the issue.  I originally thought it was the quality of the gas being used.

4 Answers


O2 sensors get "lazy" when they get older and MPG's decrease. They usually are good for 80,000-100,000 miles. Replace it to reset the code and increase fuel efficiency.

3 of 3 people found this helpful.

Your Land Rover won't pass the smog test with a bad 02 sensor. Replacing the sensor should fix the check engine light problem but no guarantees. Have the hoses from the 02 sensor checked for cracks or holes.

1 of 1 people found this helpful.

Hoses on a O2 sensor? Smog test?

3 of 3 people found this helpful.

02 sensors are part of the smog system on every car. When the sensor goes bad or a hose goes bad, the car won't pass smog. Quit often the Check Engine Light will go on. The Check Engine light is a "catch all" for many problems.

5 of 5 people found this helpful.

Your Answer


Looking for a Used Discovery in your area?

CarGurus has 2,823 nationwide Discovery listings starting at $44,900.


Land Rover Discovery Experts

  • #1
    Simon Briggs
  • #2
    Matt Mankinen
  • #3
View All

Related Models For Sale

Used Land Rover Range Rover
84 Great Deals out of 4,592 listings starting at $2,850
Used Land Rover LR3
7 Great Deals out of 321 listings starting at $4,500
Used BMW X5
375 Great Deals out of 17,179 listings starting at $2,991
Used Jeep Grand Cherokee
835 Great Deals out of 73,542 listings starting at $950
Used Toyota 4Runner
322 Great Deals out of 30,368 listings starting at $2,500
Used Toyota Land Cruiser
13 Great Deals out of 1,072 listings starting at $4,000
Used Jeep Wrangler
316 Great Deals out of 20,131 listings starting at $2,900

Used Cars For Sale

2017 Land Rover Discovery HSE For Sale
8 Great Deals out of 429 listings starting at $54,655

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.