Question about 2005 Ford Mustang GT

1 Answer

2005 Mustang GT emission control light

Emissions control light is on. Previous diagnosis indicated cam shaft position sensor, replaced cam shaft position sensor, cleared codes, light comes on again, the code reads cam shaft position again as well as engine running lean. Kwik Kar cleared those codes and recommended to switch to premium fuel and fuel injector cleaner additive in fuel. EC light comes on again. What in the world could be our problem? The engine idles rough when the car is sitting at a light or stopped in traffic. It feels like it misses when we are driving on the highway. What kind of trouble am I in and what possible solutions does anyone have to suggest?

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.


    Visited the website for 3 consecutive days.

    New Friend:

    An expert that has 1 follower.

  • Contributor
  • 23 Answers


Posted on Apr 08, 2017


6 Suggested Answers

  • 2 Answers

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

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.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 49 Answers

SOURCE: 2005 Ford Escape Rough Idle - engine code state lean fuel mixture

I recommend getting a repair manual from an auto store for your vehicle. They run $15 to $20. It will tell you exactly how to do everything you asked and also give you the values that should be expected. Hope this helps.

Posted on Feb 08, 2009

  • 69 Answers

SOURCE: Emission light

map sensor. check your spark plugs, wires, etc. maybe a loose wire plug. did u mention check engine light, i wonder can you tell me what diagnostic code came up. go to ur nearest auto parts if u dont have a scanner. and pull them codes out.

Posted on Feb 25, 2009

  • 45 Answers

SOURCE: engine runs rough at idle and bucks at highway

I had a similar problem in a 1994 Taurus, and after spending nearly 300$ on ignition parts, it turns out the problem was a bad spark plug wire that cost me 8.88$ to replace.

Posted on Mar 01, 2010

Testimonial: "n.o. 1 spark plug wire it is. thank you"

  • 775 Answers

SOURCE: I have a 98 Fordwindstar 3.8 . It failed emission

the input to the sensor must also be checked. this link provides some diagnostic procedures. diagnosis for camshaft and crankshaft sensors are similar, as stated in the article.

Posted on Jun 10, 2010

SOURCE: I have a Ford Escort

The PO 304 ---is a misfire code for cyl #3, just a code

The PO 353 --- is a misfire code for cyl#3 that refers you
to PO 350 which is an undetermined Primary or Secondary
Malfunction You can not have 300 & 350 codes on the same vehicle

The PO171 -is a Lean O2 Code for Bank 1 most likely from
a misfire yet to be determined

The PO 1131 ---Lack of Switching ,lean trying to correct
for over rich condition

Personally I think anyone that uses 10 oz of anything,
in an 16 to 18 gallon fuel tank is wasting their money
There has never been any mfg recommend injector cleaner
In a ford they say not to use it,as it will damage the pintel coating,
which I doubt,still useless product

Did you clean the MAF Sensor

Continue to check for leaks,including
the EVAP System Hoses & Components

I would scope the O2 Sensors,you won't have
a scope & I don't care for a meter, as you don't
see the switching counts or time if they are old & slow

At 100,000 miles, change the ones closest to the engine

For a 40 mph issue under the slightest of vacuum load
check the Egr Valve,unplug hoses,plug them & road test
up hill

Do all your egr & coil testing on a hot day & up hills,
easy on the gas to load the engine some

The misfire codes you get on a ford are only correct about
2/3 of the time & you disregard almost all the misfire ones
You may have to walk 1 new coil until you get to the bad one

Your real issue is the idle problem
Check all vacuum items
Be nice if you could Smoke Test everything
& end that exercise

Check the cam timing before you spend days
going into the belt area

You could use a scanner to look at data,don't know if
you know anyone with one at work

Posted on Jun 17, 2011

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

My engine light came on in my 2005 Ford Mustang GT and the code reads: Circuit A, Cam Shaft Position Sensor. Then my RPM gauge worked then stopped working then worked then not. I was driving my car and the...

Don't think it is the computer , wiring issue more then likely !
P0340 Camshaft Position Sensor Circuit Malfunction
P0340 - Camshaft Position Sensor 'A' Circuit Malfunction
Do you know anything about testing automotive electronics , an electrical circuits ?

ECM Inputs and Outputs Diagnosis

Electric Testing Techniques You Need to Know

Do you have an know how to use a digital volt ohm meter ? How to use a wiring diagram to pin point testing areas in a wiring harness . free wiring diagrams !

CAM or Camshaft Position Sensor Testing

Apr 30, 2017 | 2005 Ford Mustang

1 Answer


It should pass if the problem was erased from the computer. You should have received a "check engine " light warning about a problem. The light should be off now that the computer is cleared.

I would say that you should ask what Code number was indicated for your problem. I find it interesting that this particular sensor would allow the engine to continue to run if the sensor was bad. Also it may be a good idea to drive 40-50 Miles on the E-way to allow the Catalytics to heat up and stabilize after running so long with a bad part.

If you still have problems with the test, there are a few additives that are suppose to help the car pass the test while the chemical is in the tank. I hope my solution is very helpful to you.

Mar 23, 2011 | 1996 Ford Taurus

1 Answer

P1443 auxiliary emission control, 1997 mustang gt

DTC P1443 EVAP Purge Control Solenoid '2' Circuit Fault

Check the evap line and components for damage. Has a tune up ever been done?

Good luck.

Jul 14, 2010 | 1997 Ford Mustang Cobra

1 Answer

I have a 98 Fordwindstar 3.8 . It failed emission on code P0340 . I replaced the cam shaft position sensor it still shows code P0340 what else could it be?

the input to the sensor must also be checked. this link provides some diagnostic procedures. diagnosis for camshaft and crankshaft sensors are similar, as stated in the article.

Jun 10, 2010 | 1998 Ford Windstar

1 Answer

Mustang GT Coupe 2010 with 5500KM emission control light on> Please help what could it be>>> Thank You Elvira Australia

Loose gas cap can set the emission control light to come on. Your Mustang is till under warranty, so when you get a chance. Bring it back to the dealer to ensure that it's not a major issue.
Thank you for using Fixya and be safe.

Apr 16, 2010 | 2009 Ford Mustang

1 Answer


The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

A flashing check engine light is an indication of a severe misfire or problem that is likely to harm your engine. Immediate diagnosis and service is needed.

Some specific causes for the light to be on are:

Gas cap left off, not tightened, not installed correctly, or needs to be replaced

02 sensor

Engine misfire - error might clear itself after 3 complete warm-up cycles; not restarts, but warm-ups

At start up for a bulb check - Should not stay on

Problem in the emission system, including clogged exhaust or the catalytic converter not functioning properly

Dirty/clogged air filter

Dirty MAF sensor

Jan 08, 2010 | 2005 Mercedes-Benz C-Class

1 Answer

2005 Audi A4 Emission Control System Indicator Warning Light is on. What does that mean?

A vehicle's Emission Control Light is a generalized indicator that there is fault or possible malfunction in the vehicle's operating system. In some cases, these warning lights will come on if a gas cap is not fully closed. It could any one of a number of sensors such as the o2 sensor or map sensor. The thing to do is have a reputable mechanic/technician run a diagnostics test on the vehicle.

Aug 20, 2009 | 2005 Audi A4

1 Answer

An emission control sys. indicator has arised (Grand vitara 2005)

To know what it exactly is, you need a code scanner hooked to it.
If there is an autozone near you, go there, tell them the engine light is on and you need the code, takes about 30 seconds. They don't charge, where other places do. Without that code you'll be replacing things you don't need to. There is other sensors in the emission system other than the 02 sensors.

Mar 31, 2009 | 2001 Suzuki Grand Vitara

1 Answer

Service engine light

From the GM Factory service Manual:
P0341 - Camshaft Position (CMP) Sensor Performance
The other thing about this code, is that it can be caused by a faulty ignition module, or the cam sensor magnet on the timing chain gear, behind the engine front cover that the sensor mounts to. These possibilities would
require a bit more involved diagnosis than just replacing the sensor related
to the code.
I have done a tech. bulletin search for this code, and come up with nothing.

Again, need to get harness checked, and if wiring OK, further diagnosis of
the ignition system.

Mar 03, 2009 | 1998 Buick Century

1 Answer


To BIGHWEELS197, take your car to AutoZone and have them scan the computer - they'll do it for free, whereas the dealer will charge an hour's labor. Post the codes here and we can determine the problem.

To wjcomet, here are your code definitions:

P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) - this means that the primary O2 sensor on the bank of cylinders with cylinder number 1 in it is not heating up quickly enough. The heating element is eventually getting it to temperature (it has to be heated up to work) but it's getting to be too long to heat up, which can fail you for cold-start emissions. You'll have to replace this sensor eventually.

P0341 Camshaft Position Sensor “A” Circuit Range/Performance (Bank 1 or Single Sensor)

This indicates a problem with your cam angle sensor. It could be that the sensor's pickup is not working right anymore (this does happen) but it could also be because your O2 sensor isn't getting to temperature soon enough and excess emissions are being detected, the car's computer may think that the cam position is off. If the cam isn't timed right, excess emissions can happen, so the computer may believe that's what is happening. I wouldn't be surprised however if the O2 sensor that's going bad is causing this code as well.

P0404 Exhaust Gas Recirculation Control Circuit Range/Performance

Indicates a failure of the EGR valve. Again, there's a chance that the failing O2 sensor can trigger this.

P1404 is a manufacturer-specific auxiliary emissions control failure code. I don't have access to that code's definition for your car, but again it's likely to be a result of the O2 sensor fault that you're having, since it's emissions-related and the O2 sensors are the main controllers of emissions on a car.

My advice would be to change that O2 sensor, have the codes reset, and see which ones, if any, return. If none come back, you likely had only the O2 problem and that fault caused the other codes as well. If one or more of the codes returns, we'll have to troubleshoot those individually.

Oct 07, 2008 | 2000 Saturn SL

Not finding what you are looking for?
2005 Ford Mustang GT Logo

Related Topics:

61 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

77939 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers


Level 3 Expert

5651 Answers

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

Answer questions

Manuals & User Guides