Question about 2006 Ford F-250 Super Duty

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Yes the EGR valve would be the prob........Hope this helps.

Posted on Oct 15, 2010

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The egr sensor controls exhasut gas flow into the engine after the engine is warm. If the valve is stuck open, it will cause rough running. what were the DTC codes?

Posted on Oct 15, 2010

  • gerry bissi Oct 19, 2010

    p0400 to p0403 are EGR codes for a gas engine.

    Gas or diesel?
    get dtc codes from Autozone for free.


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What would make a 1996 Nissan maxima have a cut back while driving the rpm drop when it cut back an the car jerks then act as if the motor has shut down but once let up on the gas it run fine

when did vehicle have a tune up --plugs wires -filters-etc --also egr /carbon build up--fuel filter--failing fuel pump--cat converter all can cause such problems

Nov 12, 2016 | Nissan Cars & Trucks


My Engine Check Light Is Illuminated

There's nobody on Fixya who can give you a definitive answer as to why your engine check light is on. It just isn't possible, and nobody will tell you to replace parts because some of the parts can be pricey.

If you can understand a number of the causes that lead to a check light coming on, it will go some way in helping you decide what may be the fault:

The Oxygen Sensor
Often referred to as a Lambda sensor.
An oxygen sensor is fitted on the exhaust system before the catalytic converter. It monitors the unburned oxygen from the exhaust and detects how much fuel is being burned at any given time.
A faulty oxygen sensor means it's not providing the right data to the computer and will cause a drop in miles per gallon. Some cars may have more than one oxygen sensor.

Over time, the sensor becomes coated by burnt carbon waste from the exhaust and loses its ability to alter the oxygen / fuel mixture for different driving speeds and conditions. A faulty oxygen sensor also increases exhaust emissions.

A failed oxygen sensor can eventually cause the catalytic converter to burn out. The smell of a burnt catalytic converter is likened to the smell of 'tom cat p**s'. A replacement catalytic converter doesn't come cheap.

Mass Air Flow Sensor
The mass airflow sensor tells the car's computer to add the correct amount of fuel based on the amount of air being drawn into the engine for combustion. A faulty mass air flow sensor also affects mpg, increases emissions, and can cause the car to stall.

Mass airflow sensors can fail over time because of an improperly installed air filter - or an air filter that has never been changed. You should replace the air filter at least once a year to help prevent the airflow sensor from failing.

Spark Plugs
Yes, faulty spark plugs can cause the engine check light to come on - that's because misfiring plugs cause a problem elsewhere in the fuel/air management.
You may feel a 'jolting' when accelerating. Spark plugs fail and there's not much you can do to prevent that from happening.

Fuel Filler Cap
Probably knows as the gas cap in the USA?
Incredibly, an untightened or cracked filler cap can cause problems. Some modern cars even have an error code that suggests a faulty fuel cap.

The Exhaust Gas Recirculation valve.
In internal combustion engines, exhaust gas recirculation is a nitrogen oxide emissions reduction technique used in petrol/gasoline and diesel engines. An EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. It reroutes some of the exhaust gases which are emitted by the engine into the combustion chambers. This effectively reduces temperatures in the combustion chambers.
The exhaust gases from the engine can cause the egr plunger (or 'butterfly valve' - which is a small circular disk inside the throttle body) to stick open or closed, leading to differing symptoms such as engine knock when fuel is ignited too early or rough running. It is the engine timing which is affected.

Most EGRs can be removed and cleaned out. Most EGRs are expensive to replace.

Camshaft and/or Crankshaft Sensor
More often than not when these fail the engine will not start, but this isn't always the case nowadays. Some vehicles have a 'limp home' mode. Replacement of the faulty sensor is the only cure.

There's other sensors too. Your car is a veritable network of data being transmitted from/to a whole host of interconnected sensors.

For the home mechanic the most expensive - and frustrating - way of fixing something is to replace one part after the other in the hope that the problem is solved.

Your first course of action should be to have a diagnostic test carried out. Identify the fault first. It's well worth paying a mobile mechanic to carry out a diagnostic test first.

on Feb 08, 2016 | Cars & Trucks

3 Answers

P1200how we solve indigo diacore

Hi there:
DTC P1200 - lnjector control circuit

The PCM has the ability to detect a misfire by monitoring the 3X reference and camshaft position input signals from the Ignition Control Module. The PCM monitors crankshaft speed variations (reference period differences) to determine if a misfire is occurring. If 2 percent or more of all cylinder firing events are misfires, emission levels may exceed mandated standards. The PCM determines misfire level based on the number of misfire events monitored during a 200 engine revolution test sample. The PCM continuously tracks 16 consecutive 200 revolution test samples. If 11 or more misfires are detected during any 5 of the 16 samples, DTC P0300 will set. If the misfire is large enough to cause possible three-way catalytic converter damage, DTC P0300 may set during the first 200 revolution sample in which the misfire was detected. In the case of a catalyst damaging misfire, the Malfunction Indicator Lamp (MIL) will flash to alert the vehicle operator of the potential of catalyst damage.


* No Vehicle Speed Sensor (VSS), Transaxle, Throttle Position (TP) sensor, Fuel trim, Fuel injector circuit, Engine Coolant Temperature (ECT) sensor, Crankshaft Position (CKP) sensor, Camshaft Position (CMP) sensor, or Mass Air Flow (MAF) sensor DTC(s) set.

* Engine speed between 450 and 5800 RPM.

* System voltage between 9 and 16 volts.

* The ECT indicates an engine temperature between -7 degrees C (19 degrees F) and 120 degrees C (248 degrees F).

* Throttle angle steady.

* The PCM is detecting a crankshaft RPM variation indicating a misfire sufficient to cause three-way catalytic converter damage or emissions levels to exceed mandated standard.


* If the misfire level is non-catalyst damaging, the PCM will illuminate the MIL during the second key cycle in which the DTC sets.

* If the misfire is severe enough to cause possible catalyst damage, the PCM will immediately flash the MIL while the misfire remains at catalyst damaging levels.

* The PCM will disable Torque Converter Clutch (TCC) operation.

* The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.


* The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.

* The history DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.

* The DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.


The scan tool provides information that can be useful in identifying the misfiring cylinder. If the DTC P0300 is currently stored as DTC status Failed Since Code Clear, the misfire history counters (Misfire Hist #1 - #6) will still contain a value that represents the level of misfire detected on each cylinder. The scan tool displayed misfire counter values (Misfire Hist. #1 through #6) can be useful in determining whether the misfire affects a single cylinder, a cylinder pair (cylinders that share an ignition coil-1/4, 2/5, 3/6), or is random. If the largest amount of activity is isolated to a cylinder pair, check for the following conditions:

* Secondary Ignition Wires.

Check the secondary wires associated with the affected cylinder pair for disconnected ignition wires or for excessive resistance. The wires should measure under 30,000 ohms (30 K ohms). Replace any wires with excessive resistance.

* Damaged Or Faulty Ignition Coil.

Check for cracks, carbon tracking or other damage. Also check coil secondary resistance. Secondary resistance should be between 5000 ohms and 8000 ohms (5 K ohms and 8 K ohms). Replace any faulty coil(s). Refer to Ignition Control Module.

* Substitute a Known Good Coil.

Switch ignition coils and retest. If the misfire follows the coil, replace the ignition coil.

If the misfire is random, check for the following conditions

* System Grounds.

Ensure all connections are clean and properly tightened. Refer to Ground Distribution in Electrical Diagrams.

* Mass Air Flow sensor.

A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition. Try operating the vehicle within the fail records conditions with the MAF sensor disconnected. If the lean or misfiring condition is not present with the MAF sensor disconnected, replace the MAF sensor. Refer to MAF Sensor.

* Damaged accessory drive belt or driven accessory.

A damaged serpentine belt or belt driven accessory can cause engine load variations sufficient to set a misfire DTC.

* Vacuum Leaks.

Vacuum leaks that cause intake air to bypass the MAF sensor will cause a lean condition. Check for the following conditions:

- Disconnected or damaged vacuum hoses. Refer to Emission Hose Routing Diagram.

- Incorrectly installed or faulty crankcase ventilation valve. Refer to Positive Crankcase Ventilation Valve

- Vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.

* Fuel Pressure.

Perform a fuel system pressure test. A faulty fuel pump, plugged filter, or faulty fuel system pressure regulator will contribute to a lean condition. Refer to Fuel System Pressure Test. See: Computers and Control Systems > Component Tests and General Diagnostics > Fuel System Pressure Test

* Fuel injector(s). Go to Fuel Injector Coil Test. See: Computers and Control Systems > Component Tests and General Diagnostics > Fuel Injector Coil Test

* Contaminated Fuel. Go to Alcohol/Contaminants-in-Fuel Testing Procedure. See: Fuel Delivery and Air Induction > Testing and Inspection

* EGR System.

Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.

* Extended Idle.

Excessive open loop operation caused by extended idling or short trip driving may leave deposits on the heated oxygen sensors. The deposits cause oxygen sensors to respond slowly to exhaust oxygen content, affecting fuel control and causing a misfire to be indicated at idle. This condition is not permanent. To determine if this condition is causing the DTC P0300 to be set, review the freeze frame and fail records data for DTC P0300. If the DTC P0300 occurs at high engine speeds, the condition described above did not cause the DTC P0300 to set. If the DTC P0300 occurs at idle or very low engine speeds and at engine coolant temperatures below 80 degrees C (176 degrees F), the condition described above is very likely the cause of the DTC P0300 being set. The deposits on the heated oxygen sensors can be eliminated by operating the vehicle fully warm at mass air flows above 15 gm/s.

Important: If the level of misfire was sufficient to cause possible catalyst damage (if the MIL was flashing), ensure that the DTC P0420 test is completed and passed after verifying the misfire repair.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 13, 2012 | Tata Indigo Cars & Trucks

1 Answer

Keeps giving P0171 reading any help

P0171- System Too Lean (Bank 1)

The adaptive fuel strategy in the vehicle's computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running.

A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:
The following is an overview of P0171 check engine light code possible causes.

Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter

Exhaust System

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

Diagnostic Help:
A very thorough discussion of how to approach and repair a P0171 check engine light code can be found here. If you need further assistance let us know. Please be sure to stop back in and visit some of our other very useful site features to lear more about your car's emissions system.

Hope this helps (remember to rate this answer).

Jan 22, 2011 | 2000 Volkswagen Beetle

1 Answer

2001 Honda Passport, Engine light was on. Also acts like it wants to stop the first time I start it each day and has stopped on me a few times before I put in drive or reverse. EGR valve, ports, and...

Sorry for the delay,having my shoulder rebuilt. The gaskets between the upper &lower plenum are a steel/plastic assembly,known to crack and cause a vacuum leak. This will cause a hard start cold and a higher than normal idle when warm.Usually by the time you notice these things the check engine light is on, indicating the idle speed is out of range.The intake can be separated,just enough,to replace the gaskets without removing fuel lines etc.find an experienced Isuzu or Honda technician..It should be about 1.5-2 hour job

Apr 12, 2010 | 2001 Honda Passport

1 Answer

I have a 99 Ford escort with the check engine light on. The diagnostic says it is running lean. I changed EGR Valve sensor and front O2 Sensor. Any advice on what to try next?

Lean condition causes go from a clogged fuel filter to a vacuum leak to a weak fuel pump.Lean means there is not enough fuel for the combustion chambers.check these items:)

Aug 13, 2009 | 1999 Ford Escort

1 Answer

Same issue as above, except on a 2002 Taurus.

P1131 (Fault Location) Heated oxygen sensor (HO2S) 1, bank 1, bank 1-not switching, fuel trim (FT) weak mixture (Probably Cause) Wiring, intake/fuel system, HO2S, EGR system, oil level, camshaft timing, cylinder compression, ECM. Could be any one of these. Is your oil level ok on your dip stick?

Jul 31, 2009 | 2002 Ford Escape

1 Answer

94 Automatic Geo Metro 3 Cyl. Map Sensor - EGR Valve

Unfortunately, both of these items are equally important and repairs can't normally be avoided by taking care of your car.

Your MAP (Mass Air Pressure) Sensor measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. It contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold.

Your EGR (Exhaust Gas Recirculation) valve recirculates exhaust gases through the intake manifold to be burned again, cooling peak combustion temperature. Dilutes the air and fuel mixture to keep the nitrogen oxide emissions within breathable limits. And yes, it could very well be that the EGR solenoid that is causing the issue.

Both units effect your vehicle's fuel/air mixture. This is important because your vehicle running lean/rich can cause "snowball" problems. For example, a faulty EGR can cause the vehicle to run rich/lean. If not repaired, in time, the exhaust caused by the wrong rich/lean fuel mixture can damage the O2 sensors and/or catalytic converter.

If I had to pick, I'd start with your MAP Sensor. One guess I would have is that your MAP Sensor failed and made your vehicle start burning the wrong fuel/air mixture. Assuming I'm right, this could have damaged the EGR Valve. So, I see no reason to replace the EGR Valve alone, just so it too can be damaged by the poor fuel/air mixture caused by the still-faulty MAP Sensor. If your lucky, you may see the faulty EGR code disappear once your MAP Sensor is replaced.

Hope this helps and good luck!

Aug 18, 2008 | 1994 Geo Metro

3 Answers

95 intrepid running rough??

possibly the EGR valve or EGR solenoid. it regulates the fuel intake

Aug 16, 2008 | 1995 Dodge Intrepid

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