Question about 2004 Mercury Mountaineer

1 Answer

Service engine light on mechanics machine read code po456 emmission leak new gas lid was put on two weeks ago light went off for 2weeks.now back on in febuary I had the same thing the shop found a pin hole in one of the gas lines close to the tank 450.00 later the problem returns.I want to know if this problem is unusual and how can I get around not flipping the bill again.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Mercury Master
  • 5,537 Answers

It can simply be the gas cap is not screwed down after the last fillup. Remember too that you need to clear the computer code or it will take 25 to 50 startups to cycle the code out of the system. Autozone or Oreillys scans for free and can wipe the memory of the computer for you. Check for a clamp on the fuel fill which joins the filler to the large tank hose. Its under the wheel well.

Since you wrote about the Febuary service, March, April, and some of May could be within 90 days. Also Emission parts are usually covered by Law for a longer time period. You should check by calling Ford, Lincoln, Mercury Customer service and asking about the earlier replacement part(which parts are covered, if its one of them). You may be able to recover some of that $450, especially if a Dealer charged you for a covered repair.

What the repair facility needs is a "smoker" machine which reveals leaks. There is also a solenoid which opens the vapor canister to draw out fumes. The repair shop should test the part they installed to see if it was defective. There have been several reports to Fixya about Mice eating wiring and chewing hoses. This applies to all models of vehicles.

Posted on May 10, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Strong gas odor inside van and outside. Check engine light came on today. No leaks drives fine. just passed emmissions 4days ago


Good thing you passed before the engine light came on. You should mos def get the code from that engine light. If you smell gas you have a leak in the system. Same thing happened to me i had to drop the tank and change the seal around the lid of the fuel pump housing because the smell was coming from under the car and in the car. I also followed my fuel lines and saw some cracks forming so i replaced those and the gas cap for the heck of it. Only $20 for everything but make sure to pull the code first. It reslly makes things easier.

Apr 14, 2013 | 2000 Ford Windstar

2 Answers

Engine code po456 on a 2005 mustang gt


It's a code related to an EVAP leak in your emissions system. A lot of people have reported loosening their gas cap, re-tightening it, and then clearing the code with success in it not coming back. Here is a bulletin posted on the issue from ALLDATA

http://ww2.justanswer.com/uploads/paynlessauto/2009-10-05_203445_fueltsb.pdf

Jul 28, 2012 | Ford Mustang Cars & Trucks

1 Answer

Why does the check engine light comes on saying the gas cap is loose or off when it is on tight.


Hi,
looks like there is a sensor on the filler cap/lid side.
which is faulty and not sending correct signal to the main computer in the car.

Apr 29, 2017 | 2006 Kia Rio

1 Answer

Why does service engine soon with gas cap code keep coming on even after buying new gas cap?


Get gas cap from dealer as some vehicles are having issues with the after market caps. What is the actual code and what's the vehicle year, make and model?

May 20, 2012 | Pontiac Grand Am Cars & Trucks

1 Answer

Hi, My engine light came on so I took it to AutoZone who told me it was the EGR hose so I had that replaced 2 weeks ago. Yesterday, the light came back on so back to AutoZone I went this morning. It is...


Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause:
  • A small leak in any of the EVAP hoses or fuel tank hoses
  • A small leak in the purge valve or vent valve
  • The EVAP Canister may be leaking

Mar 13, 2011 | 2002 Chrysler PT Cruiser

3 Answers

'service engine soon' light comes on one day, then is off the next--no pattern-- no intake or liquid leaks found by mechanics?? Also, 'low coolant' light comes on now and then, no leaks found; not even...


The low coolant light could be caused by trapped air in the cooling system. If the mechanic didn't doa diagnostic scan, that needs to be done. Even though the service eng. light didn't stay on continuously, there could be stored codes in the computer.

Jan 11, 2011 | GMC Yukon Cars & Trucks

2 Answers

2001 Pontiac Grand Am


you probaly have a small pin hole in the evap system somewhere. Mechanics usually wont try to fix this problem because its a pain in rear end to locate the leak. This problem should not effect the performance of the car

Apr 14, 2010 | 2001 Pontiac Grand Am SE

1 Answer

2006 Dodge Stratus Check engine light


Small vacuum leak to start in evap system, which can quite often be traced back to gas cap. I'd clean gas cap seal good & add a little Vaseline, to the rubber "O" ring on cap, and wipe surface where cap screws in real good & clean, then have codes erased, or disconnect battery for a few seconds, and then see if it comes back. Make sure you put cap on tight after adding fuel.

Aug 30, 2009 | 2006 Dodge Stratus

1 Answer

Check engine light code PO456


most likely the pressure sensor in the fuel tank for the evap system is defective.

Feb 25, 2009 | 2004 Jeep Wrangler

Not finding what you are looking for?
2004 Mercury Mountaineer Logo

154 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts

yadayada
yadayada

Level 3 Expert

76649 Answers

fordexpert

Level 3 Expert

5537 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...