20 Most Recent 2004 Mercury Grand Marquis Questions & Answers

Disconnect the battery cables for 3minutes only if you have a key fob remote to shut off the alarm if you have one otherwise you be stuck in theft mode and a no start condition will be active are you trying to clear codes if so go to Auto zone first get the codes read and then ask them to clear it but if your doing it for inspection it won't work because system monitors need to be set and they will not if there's a problem and your check engine light will come on again or you'll fail the inspection from a monitor that's not cleared yet even if the check engine light is off

2004 Mercury... | Answered on Aug 22, 2019

Go to autozone.com enter your car info under manuals and you can look it up for FREE.


2004 Mercury... | Answered on Jul 13, 2019

Probably a shift solenoid in the transmission.

2004 Mercury... | Answered on Apr 15, 2019

the problem can be that the gear wheel can be strip on one spot ,and if the gear is plastic,and because of the back being more heavy it puts more strain on the gear and some times one can rush and push the back by hand ,all this can cause the gear to

2004 Mercury... | Answered on Feb 04, 2018

check for fuses. If some other defective stuff that you replaced broke the fuse then you may need to repower the system by replacing the fuse or a relay.

As for the air, do you mean no blower for both heat function and A/C function? An Owners Manual would show location for fuse and relay for blower. A web-search with term like "2004 Mercury Grand Marquis fuse panel or
blower relay location" could help.

Last, do not know if blower resistor relay was known good quality. This part is tempermental. Sometimes takes tap from broom or snowbrush handle to wake it up. Sad part is that after warranty there is little benefit from a used to new part. Should have been a National recall on this part.

2004 Mercury... | Answered on Jan 19, 2018

Does it have a vaccuum modulator for transmission?

2004 Mercury... | Answered on Oct 30, 2017

as long as there is power to stereo i usually try this first see if it has a factory reset button any where usually a pin sized hole if not disconect the battery and re conect the battery usually spits the cd out and resets it

2004 Mercury... | Answered on Oct 03, 2017

put car in reverse, while rolling set parking break, this will adjust the shoes out, to hold it. Be sure not to set it too many times it will lock wheels down.

2004 Mercury... | Answered on Sep 29, 2017

I would replace the clock spring rotating contact drum under the steering wheel for the restraint system warning light issues and check the operation of the headlight sensor when the lights will not go off, this is likely a sticking relay.

2004 Mercury... | Answered on Jul 28, 2017

Nothing like guessing! There can only be 2 sources of issues. Lack of fuel, lack of air flow. Check fuel pressure and flow, check EGR and IAC.

2004 Mercury... | Answered on May 24, 2017

According to my info, you don't have one. You do have a maf sensor and that should be in air intake.

2004 Mercury... | Answered on Oct 27, 2016

light control module
email me for repair instructions [email protected]

2004 Mercury... | Answered on Feb 12, 2016

Have done this job a few times at the ford dealer, and yes the entire dash must come out.

2004 Mercury... | Answered on Dec 10, 2015

PO 108 --- Baro/Map Sensor High Voltage Detected

Yes it does

It is integrated into one unit in the ESM EGR assembly

I have no experience with that,so if you find only an egr valve
& no other sensor with vacuum hoses & wires going to it,replace
the egr valve.

Getting the feeling you missed it

Work the web sites. Put in your motor & EMS Module for egr
& see what comes up

2004 Mercury... | Answered on Dec 07, 2015

Remove the steering column cowling and spray lubricant into whatever places can be reached. A gentle tapping on the lock body while rocking the steering wheel side-to-side and attempting to work the key might eventually free it and allow it to work, although even if it does the lock and key should be replaced to ensure reliability.

If it does not free the lock will have to be removed by the prescribed method and a new one fitted.

2004 Mercury... | Answered on Dec 06, 2015

You will have to take to the dealer an have the PATS system reset , need factory scan tool to do it . PATS - passive anti-theft system .

2004 Mercury... | Answered on Dec 01, 2015

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