Question about 1994 Cadillac DeVille

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Egr flow excessive

Engine sets code p0409, egr flow excessive,changed egr valve and erased the code, drove for about 5 miles and it reset same code again. Any idea why?

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Is you airflow meter working properly?

Posted on Oct 19, 2008

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Posted on Jan 02, 2017

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TROUBLE CODE PO402 FOR 2007 SILVERADO 2500HD CLASSIC 6.6 DIESEL


DTC P0402: Exhaust Gas Recirculation (EGR) Flow Excessive

The engine control module (ECM) tests the exhaust gas recirculation (EGR) flow when the EGR is in operation. EGR desired flow is compared to EGR actual flow. If EGR flow is higher than expected DTC P0402 will set.

Do you know what EGR is ?

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1995 Toyota Tercel code p0409


if you manually push up on the EGR valve and the engine doesn't stall and the passages are all cleaned out then the problem is the EGR valve.

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99 acura code p1491


Code P1491 in Honda/Acura vehicles means insufficient EGR valve lift. Note - this is not the same as 0401 for EGR low flow when you have to clean EGR passage in the intake manifold. If code 1491 is not accompanied with 0401 - that could be faulty EGR valve itself. Try to reset the code, and if it will return soon - replace EGR valve. If, however you see both codes together - cleane the manifold passage before you replacing the valve.

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1998 Ford Escort - P1405 Error code


Follow the link for help with this fault code P1405 Ford DPF EGR Sensor Circuit High Voltage Detected

I suggest you replace the EGR valve position sensor.

Mar 10, 2017 | 1998 Ford Escort

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Ford Escort P1405 Error Code


Are you sure you have EGR flow?? Hold the EGR valve open the engine should run poorly, if not you have no flow.

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Grand carvan gives p402 code


This is not a cut and dry fault code. This means that more than one thing wrong can set the code in the computers memory. Here is the low down on the P0402 fault code. This is from the OBD2 fault code diagnostic book.

P0402 - Exhaust Gas Recirculation Flow Excessive Detected
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
Possible causes - EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
- Exhaust gas leaks

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1 Answer

1998 Malibu 3.1L V6, Check Engine code P0171, Both O2 Sensors replaced, ruff idle in park, ruff idle in drive and comes to stop but smooths out, WHAT DO YOU THINK (EGR Valve?)


P0171 - is fuel system is to lean (Bank#1) Take the car back to who ever scanned it for you and see if any codes are now pressent in particular to the EGR Valve they range from P0400 up to and including P0409, or any other new codes.While you are at it make sure they erase the set code P0171 un less it is already don.If no codes show up on the new scan replace the Ignition Control Module not the ( ECM -on board computor).If new codes do show up follow up on them first. Good Luck.

Dec 08, 2010 | 1998 Chevrolet Malibu

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Code p0409? when turning ignition switch off and on.also engine light is staying on


P0409....Exhaust Gas Recirculation Sensor 'A' Circuit
Changing the EGR valve most likely will solve the problem. This website will explain it a lot better than i can. http://www.aa1car.com/library/egr.htm Good luck hope this helps

Mar 11, 2010 | 2005 Dodge Caravan

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1999 plynouth grand voyager was coding egr replace


just because the check engine light is back on, it doesn't necessarily mean it is for the same problem. it could be, but would need to pull codes again to find out what its for. literally hundreds of different codes could turn on check engine light. also, was original code for "insufficient egr flow" or "excessive egr flow"? it makes a difference.

Feb 21, 2010 | 1999 Plymouth Grand Voyager

2 Answers

Will not pass emissions code p0401 infuficient egr flow


EGR flow is monitored by the PCM by it looking for a reaction in the FRONT O2 sensor in responce to the command given to the EGR valve. The linear electronic EGR valve sends a return signal to the PCM indicating the relative position of the step motor and hence how far open (or closed) the EGR valve is in responce to the PCM command. The PCM expects to see (within a set of given parameters) a change in the O2 sensor reading (change in exhaust gas make up) after the EGR valve is commanded open or closed. If it doesn't, or that change is not within the expected parameters, a code will be set based on the skewed data. Generally a "insufficient flow" code will be set by:

1.Faulty EGR valve (sticking, or "lying" to the PCM about the actual valve position)
2.Faulty electrical connection at the EGR valve (causing false data)
3.Clogged EGR passages
4. Bad read from the MAP, or TPS, causing the PCM to misinterpret the EGR data based on faulty operational data from the other sensors
5. (Very rarely) A marginally "slow" O2 sensor. (PCM does not "see" the change in exhaust make up quick enough and interprets that as poor EGR flow.)
I have found that normally this code means that the EGR is not opening the amount that it has been commaneded to by the PCM. Normal cure for me lately has beed to repalce the EGR valve and to clean out the passages while the valve is off. The Tech 2 is able to command the EGR open and show the commanded opening and the actual opening. When this code is present the actual and commanded do not match closely at all. Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.

Mar 29, 2009 | 1999 Saturn SL

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