Last post on Jun 04, 2009 at 6:34 AM
You are in the Ford Taurus/Mercury Sable
What is this discussion about?
Ford Taurus, Mercury Sable, Sedan
#1 of 16 Check Engine Light (Gas Cap)
Jun 25, 2007 (6:22 am)
I had my codes checked and nothing was showing the garage that cehck the codes said maybe gas cap.
They also cleared all the codes but the light still stays on.
My question is would a gas cap after market work? Or do you have to get one from ford?
Another question is about the cap has anyone any idea what goes bad? Would adding a gasket help?
#2 of 16 Re: Check Engine Light (Gas Cap) [bpiri]
Jun 25, 2007 (7:05 am)
I had a gas cap go bad on my 2003 Mercury Sable. I filled up with gas and the light came on and wouldn't go off.
I bought a gas cap at a local auto parts store for a few dollars that fixed the problem.
For the check engine light to go off you must first fix the problem (eg. get a new gas cap). Then your car must go through a few cold start-up cycles, idle for so many minutes and run at highway speed for so many minutes. If you fix the problem then the light will go off after a few days driving. If you can't wait for the check engine light to go out the quick fix is to disconnect the (black) battery cable for a few seconds and then reconnect. That will clear out all of the engine codes from the computer.
#3 of 16 Re: Check Engine Light (Gas Cap) [jasmith52]
Jun 25, 2007 (9:09 am)
TY for your answer. I'm off now to get a new gas cap.
When u say hwy speed how fast and for how long?
#4 of 16 Check Engine Light
Jun 25, 2007 (1:36 pm)
Evidently they keep the check engine light on for a few days so that you don't fail a smog test.
From the owners manual...
On board diagnostics (OBD-II)
Your vehicle is equipped with a computer that monitors the engine’s
emission control system. This system is commonly known as the On
Board Diagnostics System (OBD-II). This OBD-II system protects the
environment by ensuring that your vehicle continues to meet
government emission standards. The OBD-II system also assists the
service technician in properly servicing your vehicle. When the Check
Engine/Service Engine Soon light illuminates, the OBD-II system has
detected a malfunction. Temporary malfunctions may cause your Check
Engine/Service Engine Soon light to illuminate. Examples are:
1. The vehicle has run out of fuel. (The engine may misfire or run
2. Poor fuel quality or water in the fuel.
3. The fuel cap may not have been securely tightened.
These temporary malfunctions can be corrected by filling the fuel tank
with good quality fuel and/or properly tightening the fuel cap.
driving cycles without these or any other temporary malfunctions
present, the Check Engine/Service Engine Soon light should turn off.(A driving cycle consists of a cold engine startup followed by mixed
city/highway driving.) No additional vehicle service is required.
If the Check Engine/Service Engine Soon light remains on, have your
vehicle serviced at the first available opportunity.
also from the owners manual refering to smog type test...
In some localities, it may be a legal requirement to pass an I/M test of
the on-board diagnostics system. If your indicator is on, refer to the
description in the Warning lights and chimes section of the
Instrument Cluster chapter. Your vehicle may not pass the I/M test with
the indicator on.
If the vehicle’s powertrain system or its battery has just been serviced,
the on-board diagnostics system is reset to a “not ready for I/M test”
condition. To ready the on-board diagnostics system for I/M testing, a
minimum of 30 minutes of city and highway driving is necessary as
• First, at least 10 minutes of driving on an expressway or highway.
• Next, at least 20 minutes driving in stop-and-go, city-type traffic with
at least four idle periods.Allow the vehicle to sit for at least eight hours without starting the
engine. Then, start the engine and complete the above driving cycle. The
engine must warm up to its normal operating temperature. Once started,
do not turn off the engine until the above driving cycle is complete.
#5 of 16 Re: Check Engine Light (Gas Cap) [bpiri]
Jun 26, 2007 (9:19 am)
Thanks again with your help. I found a gas cap at napa that would work with the strap from the old cap. This way I wouldn't have to put it(the cap)on top of the car and drive off. This was all done yesterday and today went into the garage and they tested again and this time it stayed off, the service engine light.
#7 of 16 follow up on Engine check light
Jul 01, 2007 (6:46 pm)
As I stated before I got a new gas cap and had the gargre reset the computter. then my wife filled the tank and didnt tighten the cap. so the next day driving the light came on
At the next stop I got out and checked the cap, and tighten it. the light was still on. so the next time I was near the shop I asked them to clear it n see if there was another problem. they check it and said that if the light comes back on I should take it to ford, because they dont have the equipment to check what is going on.
Could anyone tell me what my nexty step should be? As of now the light is off!
#8 of 16 Re: follow up on Engine check light [bpiri]
Jul 02, 2007 (4:46 pm)
Your next step is to make sure that the gas cap is tight. If the light stays off then you are home free.
If the light comes back on and the gas cap has been tight then you may have a problem. Remember though that if the light comes back on it takes several cycles to go off after the problem has been resolved.
#9 of 16 99 Taurus check engine light
Jul 10, 2007 (10:14 am)
Can check engine light mean that the transmission is about to fail in my 99 Taurus?
#10 of 16 Re: 99 Taurus check engine light [jnach]
Jul 11, 2007 (2:22 pm)
That seems unlikely. The check engine light is related to smog emissions.
However since I am not a check-engine light expert I will stand corrected if someone "in-the-know" enlightens us.