Maintence

Asked by Apr 01, 2014 at 05:49 PM about the 1999 Mercury Grand Marquis

Question type: Maintenance & Repair

Can replace oxygen sensor on my 1999 Marquis myself if so
where are they located on the car

9 Answers

113,635

Upstream or downstream?

1 people found this helpful.

I don't know just trying to get the pass admission test but took the car to auto zone and computer said oxygen sensor

113,635

It should say something like, bank sensor 1 or bank 2 sensor 1 for upstream then bank 1sensor 2 or bank 2 sensor 2. For downstream.

so it had 2 sensors if I change both the check engine light should go out

113,635

It might or might not, you could have a fuel supply or pressure problem, map sensor could be out of specs. Ect reading high or low, there a number of things that can give you an O2 code, O2 sensors are common failures but just be aware that replacing the sensors might not be the fix.

27,585

The code(s) you got were likely "Lean" or "Rich" codes. They almost NEVER indicate a problem with the sensor but a problem with the SYSTEM. Just reading the code(s) and changing the part(s) isn't going to fix it. BTW - the people at Autozone are Retail Clerks - they don't know crap about cars - they're sales people.

all the things you guys are talking about is what the machine says so what I am trying to figure out is what is the problem

113,635

To save yourself a headache and skinned knuckles, I would advise you to take it to a shop that you trust and have the system checked, make sure they can do a "live data" test, that will show what all of the sensors are reading and the ECM's response, it might be a little expensive but you will save by not just replacing parts.

1 people found this helpful.

What you think it will cost?

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,192 nationwide Grand Marquis listings starting at $1,200.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,980
  • #2
    kbro
    Reputation
    2,210
  • #3
    Js08016
    Reputation
    2,050
View All

Related Models For Sale

Used Lincoln Town Car
24 Great Deals out of 1,358 listings starting at $1,995
Used Ford Crown Victoria
710 listings starting at $1,700
Used Chevrolet Impala
397 Great Deals out of 25,595 listings starting at $799
Used Ford F-150
2,344 Great Deals out of 215,477 listings starting at $1,300
Used Chevrolet Tahoe
528 Great Deals out of 36,655 listings starting at $1,375
Used Ford Mustang
270 Great Deals out of 37,082 listings starting at $2,150
Used Ford Taurus
186 Great Deals out of 15,917 listings starting at $981
Used Lincoln Continental
22 Great Deals out of 2,780 listings starting at $21,995
Used Toyota Camry
761 Great Deals out of 70,900 listings starting at $1,200
Used Cadillac DeVille
1,272 listings starting at $1,988
Used Honda Accord
424 Great Deals out of 101,059 listings starting at $1,200

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
15 listings starting at $5,888
2010 Mercury Grand Marquis For Sale
3 Great Deals out of 72 listings starting at $2,400
2009 Mercury Grand Marquis For Sale
52 listings starting at $3,777
2008 Mercury Grand Marquis For Sale
4 Great Deals out of 96 listings starting at $2,850
2007 Mercury Grand Marquis For Sale
7 Great Deals out of 99 listings starting at $1,200

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.