Check engine light is on code says to check coolant, thermostat, temp sensor.

Asked by Dec 22, 2012 at 01:48 PM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

I have filled the coolant, replaced the thermostat and the temp sensor. The light is still on. Is there something I need to do to reset the computer or do I need to check/replace something else.

3 Answers

45

I don't know if this will apply here, but I had a similar issue with a Jeep I owned. After trying several mechanics in the area, I found out that only the dealer could reset the engine light. It was a way for them to get $25 from me. I never bought another Jeep because of that. They did say that, if the light comes right back on, they wouldn't charge me because it meant there was another issue that needed to be addressed. Hope this helps...

1 people found this helpful.
235

To reset the light, unhook your positive pole from your battery. If the light comes back on after you drive it for awhile, then you will have to take it in for service. Under no circumstances should you drive it hot. You will warp the head (s) and blow the head gasket. That cost big buck to repair.

2 people found this helpful.
Best Answer Mark helpful
10

I just had the same problem and I found the solution. Someone else who drove did not tighten the gas cap but rather just laid it loosely on top of the gas tank. This is an answer I have seen other people post and it appears that was the root of my problem. Now I just do not know when the light will go off.

1 people found this helpful.

Your Answer:

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,243 nationwide Grand Marquis listings starting at $1,799.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    6,060
  • #2
    kbro
    Reputation
    2,240
  • #3
    Js08016
    Reputation
    2,060
View All

Related Models For Sale

Used Lincoln Town Car
28 Great Deals out of 1,468 listings starting at $1,900
Used Ford Crown Victoria
746 listings starting at $2,990
Used Chevrolet Impala
442 Great Deals out of 25,964 listings starting at $950
Used Ford F-150
2,426 Great Deals out of 208,189 listings starting at $1,300
Used Chevrolet Tahoe
554 Great Deals out of 38,496 listings starting at $1,243
Used Ford Mustang
268 Great Deals out of 38,445 listings starting at $1,350
Used Toyota Camry
772 Great Deals out of 74,279 listings starting at $1,250
Used Cadillac DeVille
1,280 listings starting at $1,150
Used Honda Accord
585 Great Deals out of 104,730 listings starting at $1,225
Used Ford Taurus
184 Great Deals out of 16,036 listings starting at $600

Used Cars For Sale

2010 Mercury Grand Marquis LS For Sale
5 Great Deals out of 67 listings starting at $3,995
2009 Mercury Grand Marquis LS For Sale
52 listings starting at $2,977
2008 Mercury Grand Marquis LS For Sale
5 Great Deals out of 72 listings starting at $3,000

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.