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Does the check engine light come on when egr valve is bad

Light comes on intermittently

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Does the 1999 Lexus RX300 have an EGR valve

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Emission sensor but your going to have to scan it when it is on! to get a raed out!!

Posted on Dec 27, 2008

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SOURCE: Would faulty EGR valve cause check engine light to come on?

If EGR was out your engine light would stay on!usually hi way drive is a whole new emission game sensor work 100% different that city drive you have a O2 sensor problem don"t Get$$ the problem when if you say it only will do it on highway then take it on highway with OBD 2 in run scan mode have a passenger observe it this will give the the proper code you will need to peg it cheers!

Posted on Dec 27, 2008

468 Chevelle
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SOURCE: Service engine code indicates EGR valve.

You could have a restriction in the egr ports. remove the valve. Plug the holes, start engine. 1 hole will be blowing out exhaust, the other will have large vacuum.

Posted on Mar 28, 2009

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SOURCE: Check Engine light is even though my EGR valve is brand new

you can take it to autozone the will test it for free to see if it something else

Posted on Apr 05, 2009

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SOURCE: 02 Trooper Check Engine Light Code indicates

The EGR and all systems are computer controlled and depend on all other sensors to be working correctly. It may be a computer problem. I only say this because I just had a customer with a similar problem replaced ECM and problem solved!

Posted on Jul 08, 2009

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SOURCE: how do you fix a faulty egr valve

I HAVE A 99 JAGUAR XJ8 ....I HAVE CHANGED THE BATTERY AND ALTERNATOR, BUT STILL WON'T START. SHOULD I CHANGE THE PLUGS NEXT OR THE STARTER. IT HAS 110,000 MILES. PLEASE OFFER SOME INSIGHT ON THIS SITUATION.

Posted on Nov 22, 2009

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Egr valve was change and the check engine light keep coming on p0404


could be carbon buildup or a bad EGR valve. Did you disconnect the battery to let the computer learn the new part? However that doesn't rule out these an open or short in the 5 Volt reference circuit Open or short in the ground circuit Open or short circuit in the PCM controlled voltage circuit or a bad pcm or you got a defective egr valve

Jun 04, 2014 | 2004 Chrysler Pacifica

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

2005 magnum p0406 egr valve sensor code error


P0406 indicates high voltage on the EGR sensor circuit. this is recommended for every 30,000 miles be inspected. although EGR system do not requires periodic inspection. instead, check only if engine trouble's develop. most EGR's requires replacing EGR valve, cleaning passages and installing new vacuum hose. misrouted vacuum hose causes engine poor operation. so. not just to unplug it.

Aug 20, 2012 | 2005 Dodge Magnum

3 Answers

What are the symptoms of a bad erg valve and where is it located on a 1999 dodge duranlgo


it is located at the rear of the engine behind the intake, the most common symptom on this is just a rough idle or in most cases a check engine light that stays on, no matter what is wrong with the valve it will set a fault code and turn the check engine light on, so unless the light is on the problem is not the EGR

Nov 01, 2010 | 1998 Dodge Durango

1 Answer

Loss of power, hesitation, ODBC II error code P0404, SES light come on sometimes


P0404 - Exhaust Gas Recirculation Circuit Range/Performance OBD-II Trouble Code Technical Description

Exhaust Gas Recirculation Circuit Range/Performance
What does that mean?The EGR (Exhaust Gas Recirculation) system's purpose is to redirect exhaust gas back into the cylinders. Since exhaust gas is inert, it displaces oxygen and fuel, thereby lowering cylinder temps, which, in turn, lowers oxides of nitrogen emissions. For that reason it needs to be carefully metered into the cylinders (via the EGR valve) so as not to adversely affect the engine's performance. (Too much EGR and the engine won't idle).
If you have a P0404, then the EGR valve is likely an electrically controlled EGR valve instead of a vacuum controlled EGR valve. Also, the valve will usually have a feedback system built into it that informs the PCM (Powertrain Control Module) what position the valve is in; open, closed, or somewhere in between. The PCM needs to know this to determine whether or not the valve is operating as needed. If the PCM determines that the valve should be operating, but the feedback circuit shows that the valve is not open, this code will set. Or if the PCM determines the valve should be closed but the feedback signal indicates that the valve is open, this code will set.
SymptomsThere may be no symptoms of a P0404 DTC other than the MIL (malfunction indicator lamp) or check engine light. However, Exhaust Gas Recirculation systems are inherently problematic due to carbon buildup in the intake manifold, etc. This normal buildup can lodge in an EGR valve, holding it open when it should be closed. If this is the case, the engine may idle rough, or not at all. If the valve has failed and is NOT opening, then symptoms would be higher combustion temps and as a result, higher Nox emissions. But the latter symptoms aren't going to be noticeable to a driver.
CausesUsually this code points to either carbon buildup or a bad EGR valve. However that doesn't rule out the following:

  • Open or short in the 5 Volt reference circuit
  • Open or short in the ground circuit
  • Open or short in the PCM controlled voltage circuit
  • Bad PCM (less likely)
Possible Solutions
  1. Using a scan tool command the EGR valve to open while watching the actual EGR position (it will probably be labeled "desired EGR" or something similar). The actual EGR position should be very close to the "desired" EGR position. If it is, then the problem is likely intermittent. It may have been a lodged piece of carbon that has since dislodged, or it could be a bad EGR valve winding that intermittently opens or shorts as the valve temperature changes.
  2. If the EGR "desired" position is not close to the "actual" position, then unplug the EGR sensor. Check for a good 5 Volt reference voltage to the connector. If it doesn't show a reference voltage, repair an open or short in the 5 Volt reference circuit.
  3. If there is a 5 volt reference voltage, activate the EGR with the scanner, monitor the EGR ground circuit with a DVOM (Digital Volt/Ohm meter). It should indicate a good ground. If it doesn't then repair the ground circuit.
  4. If there is a good ground, then check the control circuit. It should indicate voltage that varies according to the percentage that the EGR is open. As it's open more, the voltage should increase accordingly. If it does, then replace the EGR valve.
  5. If the voltage doesn't increase incrementally, then repair open or short in EGR control circuit.

Oct 22, 2010 | 2001 Oldsmobile Alero

1 Answer

1984 buick regal 3.8 carbed v6. Intermittent


Sounds like a bad wiring connection in the egr circuit.

Mar 03, 2010 | 1984 Buick Regal

1 Answer

Car idles hard when i stop at traffic lights or slow down.. i recently had the check engine light come on and the dealer changes the egr selenoid and valve.. but problem persist and is intermittent


THE IAC VALVE (IDLE AIR CONTROL) MAYBE DIRTY OR STICKING,TRY CLEANING THE THROTTLE BODY WHERE IAC VALVE IS. IF THAT DOES NOT WORK REPLACE IAC VALVE.

Feb 02, 2010 | Hyundai Motor 2002 Sonata

1 Answer

I just bought a 1997 Mercury Sable it was a private sale. Once I got it home the check engine light was on can't remember the code but it when I looked it up it was the canister purge valve. Spent $80. for...


P0401 insufficient EGR flow.

Possible causes:
  • Fault in vacuum supply to EGR vacuum regulator solenoid.
  • EGR valve stuck closed or iced.
  • EGR valve diaphragm leaks.
  • EGR valve or flow path restricted.
  • EGR vacuum hose off, plugged or leaks.
  • VPWR circuit open to EGR Vacuum Regulator solenoid.
  • EVR circuit to PCM open.
  • EVR circuit to PCM shorted to PWR.
  • Differential Pressure Feedback EGR (D.P.F. EGR) sensor pressure hoses both connected improperly.
  • D.P.F. EGR sensor pressure hoses reversed.
  • D.P.F. EGR sensor VREF circuit open.
  • Downstream pressure hose off.
  • Downstream pressure hose plugged.
  • Damaged orifice tube assembly.
  • Damaged EGR Vacuum Regulator solenoid.
  • Damaged D.P.F. EGR sensor.
  • Damaged PCM.



P0443 indicates an intermittent EVAP canister purge valve circuit failure.
Possible causes:
  • Intermittent EVAP canister purge valve or VPWR circuit open.
  • Damaged EVAP canister purge valve.

Mar 13, 2009 | 1997 Mercury Sable

1 Answer

Would faulty EGR valve cause check engine light to come on?


If EGR was out your engine light would stay on!usually hi way drive is a whole new emission game sensor work 100% different that city drive you have a O2 sensor problem don"t Get$$ the problem when if you say it only will do it on highway then take it on highway with OBD 2 in run scan mode have a passenger observe it this will give the the proper code you will need to peg it cheers!

Dec 27, 2008 | Ford F-150 Cars & Trucks

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

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