Question about Hyundai Sonata

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I have a 2002 hyundai Sonata 2.4 liter 4 cyclinder error code p0401 comes on peplaced egr valve and vaccum hose off of intake,code came back on just after 30 miles.

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Try changing o2 sensor

Posted on Sep 02, 2010

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1 Answer

P0401 code


causes include --hose leakage / blockage, basic setting not carried out ( if applicable)--wiring---EGR valve ---EGR solenoid ---ECM

Jun 23, 2016 | 2002 Dodge Stratus

1 Answer

Code p0401


on a mazda protege. 1.8L. You have a clogged vacuum port. On that intake back by the EGR valve there should be a port with a vacuum hose that goes over to the Right side strut tower. That line should have vacuum. That controls your EGR boost solenoid. If that line does not have vacuum it will be clogged at the nipple where it comes out of the intake. Step two. Take off throttle body. Behind the throttle body, looking inside the intake, there should be a big vacuum port. It will be clogged. You will see a big black ring most likely around the hole where the port should be. I usually pull the EGR valve off the intake so it doesn't get carboned up. Blow through that vacuum port with shop air and use a pick and some carb cleaner on it. This should solve your issues with the egr flow issue on this vehicle. 9/10 the ports will be clogged. Good luck.

May 03, 2014 | Mazda Protege Cars & Trucks

1 Answer

The check engine light is on, the EGR valve has been replaced, code P0401 appears on diagnostic. The engine is 4 cyl DOHC 2 wd. slight exhaust odor at times in vehicle.


Are you reset the stored codes there? The EGR (Exhaust Gas Recirculation) valve controls an engine's emission of smog-causing nitrous oxides, or NOx. Its job is to route a portion of the exhaust gases back into the intake manifold. That lowers combustion temperature to below 2,500 degrees Fahrenheit - the temperature at which NOx gases form.

EGR flow is controlled by the engine's computer, which opens or closes the valve as needed. The EGR system is, for the most part, in the "out of sight, out of mind" category, and typical doesn't require regular maintenance. But if it gets clogged with carbon deposits, you'll see your "check engine" light come on, and a code (perhaps P0401 or P0402 or P0403) will show that there is insufficient flow. That typically results from a vehicle being driven persistently on short trips that don't allow the engine to fully warm up. Flow problems also can be caused by carbon buildup due to failure to change the oil frequently enough.

A clogged EGR valve not only results in higher emissions, it can affect fuel economy and cause rough idling - even serious engine damage. Valves can usually be cleaned, but replacement is often recommended.

About thie generic fault code, I suggtes check this description and tips for solution information: DTC-P0401-Tests (keep in midn that this code applied for alot brands, Hyundai included).

Keep us updated.

Feb 09, 2011 | 2003 Hyundai Santa Fe

3 Answers

Whats does code P0401 mean ??


Hi,

P0401 means insuffient EGR flow:

EGR stands for Exhaust Gas Recirculation, which basically sends some of the exhaust back into the engine cylinder again. Your error means that there isn't enough of the exhaust gas making it back to the intake manifold.
The first thing I'd check is the tubes coming off of the EGR valve to make sure they aren't clogged or broken. Then I'd check the EGR valve itself and the throttle body. The problem is usually:
1.) Carbon buildup causing a clogging.
2.) Broken hoses.
3.) Broken Valve.

Best regards.

Oct 28, 2010 | 1996 Honda Accord

1 Answer

I use seafoam though vaccume hose after that i read code p0401 what that means


P0401: Exhaust gas recirculation (EGR) system - insufficient flow detected


Causes: Hose leak/blockage, basic setting not carried out (if applicable), wiring, EGR valve, EGR solenoid, ECM

better clean out hoses and valves...

Oct 04, 2010 | 2002 Honda Accord

2 Answers

P0401 Exhaust Gas Recirculation Flow Insufficient Detected replaced the EGR valve but "check engine light" comes back on with same P0401 code


check the metal line that comes off the exhaust and make sure it isnt plugged with carbon. also remove the egr and check the port and see it's clogged as well

Nov 17, 2009 | 1998 Oldsmobile Silhouette

1 Answer

Replacing EGR Valve on '00 Sonata 2.4L...Got a


Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.
NOTE:.. EGR RESTRICTION POSSIBLE between exhaust manifold and EGR valve... check it out before replacing valve.... replacing the valve may not be the solution... having it properly diagnosed is!

Sep 10, 2009 | 2000 Hyundai Sonata

4 Answers

2005 hyundai sonata - no warranty


go to autozone buy a repair manual.its about.$24.00 dollars.it will show you show you how to do your own repair.you go buy the egr valve and tps sensor.now on the egr valve make sure the port in the intake where the egr valve is not stop up with carbon.if so becareful and easy cleaning out the carbon using a piece of clothes rack .clean up the debris.reason so because egr valve is not cheap.i seen them from $250.00 and up.you dont want to buy one if you dont need it.

Jun 12, 2009 | 2006 Hyundai Sonata

2 Answers

Engine lt on


There is a vsv (vacuum switching valve) located under the intake manifold that goes bad very often causing this code. Its hard to get to. Follow the hoses from the black plastic round valve(egr modulator) you see next to the EGR valve to find the vsv.

Apr 02, 2009 | 2000 Toyota Camry

4 Answers

2000 Honda Accord EGR Valve Error P0401


Jason,
-after you change the part you have to reset/clear the code

-this can be done by either:
(1) using the OBD2 code reader that Autozone used OR since option 2 (below) is very quick
(2) disconnecting the battery for about 30 seconds (this will delete all codes/radio presets/etc) but it will also clear the 'check engine' code
-this is what I do AFTER i write down my radio station presets :)

-hopefully the new EGR valve resolves your issue after you CLEAR the code
...but that code just means a an insufficient amount of Exhaust Gas recirculation (pressure difference) used to keep the emissions in check
-if it comes back, then there are a few other fixes to try also

-let me know if you need further assistance
-please remember to rate me `fix-ya`if it works
thanks

Nov 03, 2008 | 2000 Honda Accord

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