Question about 2004 Lincoln LS

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Code reads egr valve/sensor problem. My check engine light recently starting flashing (instead of just staying on). I notice when it is flashing a shutter in the car and more difficulty driving. Also when the check engine light is flashing the air seems to get hotter. What's wrong?

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EGR Valve failed,causing the MIL Lamp to come on and car to slam and ****, going up hills,that is when you have a high vacuum load on engine. May seem like a trans problem.

Posted on Oct 07, 2010

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03 honda civic 1.7L p0401 EGR code.


In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit. Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open Clean out the EGR valve and/or tubing to remove deposits Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model) Replace the DPFE sensor (with a good quality / OEM one)

Read more at: https://www.obd-codes.com/p0401
Copyright OBD-Codes.com

Sep 19, 2016 | 2003 Honda Civic

1 Answer

I have a 1998 ford escort with a check engine light on and can't get it off


Here is a list of possible causes. Some things you have already done.

EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Faulty EGR Pressure sensor
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
- Exhaust gas leaks
Read more: http://engine-codes.com/p0401_ford.html#ixzz28fATCih2

Oct 07, 2012 | 1998 Ford Escort

1 Answer

Changed egr.check engine light stays on.hesitates between 30 and 40 mph. after it gets goin will start jerking and vibrating real bad.check engine light starts blinking


Check your Back pressure valve. The hose on the top of the EGR runs to the backpressure valve loated on the firewall of your car. Also check the mass air flow sensor. There are plenty of times when the EGR code pops up that something else is wrong with that system

Jun 27, 2011 | 2000 Isuzu Trooper

1 Answer

My engine light on codes are p1504 and p401i think it said for idle speed control


P0401 - Insufficient EGR Flow
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

Symptoms: You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

Causes: A code P0401 most likely means one or more of the following has happened:
The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
There is a blockage in the EGR (tube), most likely carbon buildup
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions: In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit:
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
Clean out the EGR valve and/or tubing to remove deposits
Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
Replace the DPFE sensor (with a good quality / OEM one)
Replace the EGR valve


P1504 - Intake Air Control circuit malfunction
The problem likely is a defective IAC valve. You can check the valve by unplugging the IAC and checking the resistance between the 2 wiring pins, should be between 6 to 13 ohms. Also check the resistance from the pins to the IAC body, meter should read open circuit, any resistance reading from the pins to the IAC body indicates a short. I doubt that there is a problem in the wiring harness or PCM, it is possible and should not be ruled out, although it is not seen often.

Jun 18, 2011 | 1999 Ford Taurus

1 Answer

2005 Chrysler Town & Country Check engine light came on.


Replace the EGR valve, the code is for EGR system performance

Jun 03, 2009 | 2006 Chrysler Town & Country

2 Answers

Engine misfire, EGR replaced still rough idle! I recently got my camaro, 96 V6. I noticed a couple days ago that it was lacking power and then my check engine light came and it was flashing. After that it...


First, check the passageway to the egr valve to make sure it is clear (often plugs up with carbon) second, make sure that the egr control is working. Also a good idea to have any codes checked and old ones cleared.Computer may need to cycle a few times to "learn"new parameters.
In general, it is good to shut down your engine when check engine light comes on...The next step after that is to determine why the light came on.
If the cause is an oil related or coolant related item, you should drive no further 'till it's corrected...However, there are numerous sensors that can turn it on with no disasterous results if you continue to drive One example is the light coming on because a gas cap has not been put on correctly...On many vehicles this will turn on the light and set a code, but the car will suffer no damage if you drove to your destination before correcting it.So, if the light comes on and it is not overheating and you have good oil pressure, and you hear no noises from engine, have it looked at but don't put yourself in danger on the side of a major highway for a nonsense code.
Most major parts houses will read codes free...take advantage of that service and get yourself a basic repair manual, so you have an idea what all the stuff under your hood is and does.
Good luck with your car!!

Apr 26, 2009 | 1996 Chevrolet Camaro

1 Answer

I have problem with code 1126 (toyota 4 runner 2001


Manufacturer Specific Codes

P1100
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P1125 Throttle Control Motor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1126 Magnetic Clutch Circuit

P1127 ETCS Actuator Power Source Circuit

P1128 Throttle Control Motor Lock

P1129 Electric Throttle Control System

P1130 Air/Fuel Sensor Circuit Range/Performance (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code - More Related Information

P1133 Air/Fuel Sensor Circuit Response (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code

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P1155 Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2)

P1200 Fuel Pump Relay Circuit

P1300 Igniter Circuit Malfunction - No. 1

P1305 Igniter Circuit Malfunction - No. 2

P1335 No Crankshaft Position Sensor Signal - Engine Running

P1349 VVT System

P1400 Sub-Throttle Position Sensor

P1401 Sub-Throttle Position Sensor Range/Performance Problem

P1405 Turbo Pressure Sensor Circuit

P1406 Turbo Pressure Sensor Range/Performance Problem

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P1411 EGR Valve Position Sensor Circuit Range/Performance - Read Our Article on EGR Valve Codes For Help With This Toyota Check Engine Light Code

P1500 Starter Signal Circuit

P1510 Boost Pressure Control Circuit

P1511 Boost Pressure Low

P1512 Boost Pressure High

P1520 Stop Lamp Switch Signal Malfunction

P1565 Cruise Control Main Switch Circuit

P1600 ECM BATT Malfunction

P1605 Knock Control CPU

P1630 Traction Control System

P1633 ECM

P1652 Idle Air Control Valve Control Circuit

P1656 OCV Circuit

P1658 Wastegate Valve Control Circuit

P1661 EGR Circuit

P1662 EGR Bypass Valve Control Circuit

P1700 Vehicle Speed Sensor '2' Circuit Fault

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Back To Top Of Toyota Check Engine Light Codes Page

Mar 21, 2009 | 2002 Toyota 4Runner

1 Answer

I am having trouble getting my check light to go off after I had it checked and the EGR valve was replaced. The light comes back on after about 15 miles of driving and the code reads EGR poor flow. I can...


Insufficient EGR Flow Detected

Possible Causes:
DPFE sensor signal circuit is shorted to ground
DPFE sensor VREF circuit is open between sensor and PCM
DPFE sensor downstream hose off or plugged
DPFE sensor hoses both off, loose or damaged
DPFE sensor hoses connected wrong (reversed)
EGR orifice tube is damaged or restricted
PCM has failed
And what sets the code is…….Engine started, engine running in closed loop under steady cruise conditions, and the PCM detected the DPFE sensor input indicated insufficient EGR gas flow. Run the KOER Self-Test, and if DTC P1408 is present, the fault is currently present. This code sets in 2 Trip(s). The light will stay on until the cause is repaired. A bad EGR valve is only on possible cause.

Hope this helps,

Dave

Feb 28, 2009 | 2002 Ford Mustang

1 Answer

Engine service light


The DPFE (Diferential Pressure Sensor)sensor is usually mounted on the engine and is connected to the pipe that runs from the exhaust manifold to the EGR valve with two rubber hoses. When the sensor goes bad, the Check Engine light comes on and typically sets any or all of teh following fault codes: P0171 & P0174 (lean codes), and/or P0401 (insufficient EGR flow). Nine out of ten times, the fault is not a bad EGR valve or a vacuum leak, but a bad DPFE sensor. A replacement costs about $112 at Ford, or about $48 at an aftermarket auto parts store.I hope this helps.

Sep 30, 2008 | 2001 Ford Mustang

1 Answer

Check engine light.


you have a vaccum leak.check for cracked hoses

Jul 22, 2008 | 2002 Ford Explorer Sport Trac

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