Question about 2004 Mercury Grand Marquis

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Check engine lit code 0456 all ready replaced gas cap mercury grand marquis 2004

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VISUALLY INSPECT ALL EVAP LINES AND IF THEY LOOK GOOD YOU MAY NEED TO TAKE VEHICLE TO A REPIR CENTER TO HAVE A "SMOKE TEST" DONE ON IT. THIS USED A MACHINE THAT SEALS SYSTEM AND INJECTS ARTIFICIAL SMOKE INTO SYSTEM TO AID IN LEAK DETECTION. GOOD LUCK!

Posted on Sep 07, 2009

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Posted on Jan 02, 2017

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1 Answer

I have code p0455 on my mercury grand marquis what can i do


This code is usually caused by a missing or loose gas cap. If the cap is on tight, check for disconnected vacuum lines in the engine compartment.

Jun 22, 2017 | Mercury Grand Marquis Cars & Trucks

1 Answer

Have 04 mercury grand marquis check engine light is on for code po452 had that fixed and light still on


Well ---PO 452 is still FTP Sensor Circuit Low Voltage Detected
new sensor or not



If the sensor reads less than .22volts with key on /engine off --you get a hard fault (code)


Check Sensor Connector


Sensor with no pressure or vacuum in tank is 2.4 to 2.8 volts
Key On/Eng Off On scan tool PIDS


You just need a shop with a data base & proper test procedure
or a different tech or different dealer.


I have the 2004 gas engine emissions diagnostic manual for all
2004 fords, as I have a Lincoln LS,so I don't know why a pro
couldn't resolve

Nov 25, 2012 | 2004 Mercury Grand Marquis

1 Answer

1999 mercury grand marques trouble code PO455


buy a new gas cap and reset the light if that dont work check the fuel filler neck to see if it is rotted if so the replace it and that should take care of that problem

Aug 24, 2012 | 1999 Mercury Grand Marquis

1 Answer

1999 grand marqui, 4.6 lit. engin. what is the spark plug gap and torque.


Make: MERCURY
Model: GRAND MARQUIS
Year: 1999
Engine: V8 - 4.6L - FI - - GAS

Part Number: RS12YC
GAP : .054" (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope this helps.

Oct 02, 2011 | 1999 Mercury Grand Marquis

1 Answer

2004 merc grand marquis. how to adjust headlights, replace turn s


ther is a plastic guard with 3 locking caps that need to be turned clockwise a quarter turn to remove. remove from the front. you will then have be able to see and have access to the lights and adjustment screws

May 26, 2010 | 2004 Mercury Grand Marquis

1 Answer

I have a 2001 grand marquis...and the engine light is staying on.it runs great.I took it to auto zone to get it tested and he looked at the code and said it has something to do with my gas.It has been on...


Try getting gas
tighten the cap till it clicks
Take it to auto zone, have him clear the error codes
And see if it comes back.
A common code for all cars is vacume loss in the fuel system, or loose gas cap.
Try it.

Feb 10, 2010 | 2001 Mercury Grand Marquis

2 Answers

I have a 2000 Grand Marquis. The check engine light came on during a recent trip. It runs fine but I am concerned about it being on. I had filled up with gas and ran it for about 10 miles with the gas cap...


no,but to find the answer so we can figure it out,you need to have codes read by a shop or if you have a Autozone close by they check codes for free

Dec 29, 2009 | 2000 Mercury Grand Marquis

2 Answers

How can i rest my check engine light on my 92 grand marquis. it comes on when i am in motion. There is nothing seriously wrong with the car, I do notice the gas milages as been poor. What could be ca


1 minute won't reset any codes for the Grand Marquis. You need to dicsonnect the ground and wait 15 mins for the caps in the comp to fully discharge.

Apr 15, 2009 | Mercury Grand Marquis Cars & Trucks

1 Answer

1994 Mercury Grand Marquis Check Engine Light Code 332


its the tube going from the egr valve to your exhaust it have carbon build up and you either have to replace it or get a metal coat hanger and clean it out.

Dec 03, 2008 | 1996 Mercury Grand Marquis

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