Question about 2002 Honda Accord

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The computer said egr or vacum leak egr checks ok , clean intake manfild still engine light on

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Replace and or clean the egr sensor as well as the air passage
check out youtube, they have many how to videos

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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2003 hyundai sonata 2.4 dtc po401 have changed egr egr solenoid and plastic vaccum valve cleaned intake ports replaced o2 sensor checked wiring all the way back to computer cleaned all engine grounds...


problem is typically the sensor or the device that is being monitored by the sensor. The the EGR return pipe is not properly engineered, a cold pipe with cause the inside to gum up with carbon deposit. This pipe is used to pick up exhaust gas to dilute the air before the combustion. If this "connection" is clogged, you will have a rough time at higher speeds. Pipe is easy enough to remote and take a look inside. If the gum up is too thick, I won't spend the time to chissle this out and just buy a replacement.

Oct 22, 2013 | Hyundai Sonata Cars & Trucks

1 Answer

1998f1504.6wtriton runs fine but getting codes 401,171and174check all vacum lines,dpfe sensor,sprayed carb cleaner everywhere,new egr ,egr tube,took off elbow and throttle body cleaned it up no blockage...


Some of these intakes have a channel under the throttle body that supplies flow to the EGR. The channel is below the mounting plate for the air horn. Also clear the computer of old Codes.

Code 171 and 174 mean lean condition. It means more air is getting into fuel mix than is metered through air intake. Try using water spray bottle on all seams and Vacuum lines while engine runs and opening will draw in water and affect RPM.

Use water spray on Brake booster while engine runs. Bad diaphragm will leak Vacuum.

Finally, rear metal tube to DPFE has 2 short Vacuum lines which DPFE fits on. The metal tube goes to Exhaust. Some have a metal ridge on this tube. The ridge can leak Exhaust flow and affect the DPFE readings. Sometimes rust can build in this tube and it may need to be cleaned to restore flow.

Sep 28, 2013 | 1998 Ford Explorer

1 Answer

P 0401 code "Insufficient Airflow" STILL!! 1996


the exhaust path there must be clear
end to end, its NOT air that is EGR fail for exh. flow, for EGR only.
which engine, ?????
no 2 engines made use the same flow.
so..........????????

Mar 20, 2017 | 1996 Isuzu Trooper

1 Answer

My 1994 firebird with a 3.4L check engine light will always come on after letting off the gas, and coasting. had code checked. bad egr valve. replaced valve, wire connector. disconnected battery to reset...


REMOVE EGR VALVE CLEAN OUT THE CARBON INSIDE THE EGR VALVE PORT HOLE IN THE INTAKE MANIFOLD WHERE EGR VALVE SITS.CAREFULLY USE A PIECE OF CLOTHES RACK OR A TINY SCREW DRIVER CLEAN CARBON OUT ROUND HOLE.USE A SHOP VAC TO VACUUM UP THE DEBRIS TO KEEP FROM GETTING INSIDE INTAKE.DONT USE SHOP VAC IF YOU HAVE ANY FUEL LEAKS OR SMELL GAS FUMES UNDER THE HOOD.

Oct 31, 2010 | 1994 Pontiac Firebird

1 Answer

96 pontiac grand prix se 3.1 service engine light is on and flashing. car runs bad. sometimes it has no power to get up an go. goes through alot of gas and smells of fuel bad. had it put on computer all...


clear the codes run engine and see what codes come back up egr valve that could just need a clean, ignition coil and module that could be just because of the egr valve, misfiring could be the spark plug or lead on number 3, check clean all spark plugs, check clean or replace the air filter and check for vacume leaks.

Jul 29, 2017 | Pontiac Grand Prix Cars & Trucks

1 Answer

Ihave 05 durango with 4.7 have black sutt around the tailpipe and code for the check engine light is for egr valve or vacuum leak


sounds like a stuck EGR valve causing the engine to run ritch , could also be a vacum leak at the intake area ,you should be able to hear this it would be a hissing noise while the engine is idling .

Apr 09, 2010 | 1999 Dodge Durango

3 Answers

I have a 99 f150 that has a code showing its p0402 egr valve excessive flow the engine is a 5.4 how do i fix it


First make sure all lines are connected to EGR , if not ,connect them if they are? Then remove EGR value and clean and reconnect.

Jan 24, 2010 | 1999 Ford F150 Regular Cab

1 Answer

Engine check light, code 401 low egr vacum egr


The EGR and the lift sensor may look perfect from the outside but the under side of the EGR valve and the EGR passage (small tube) are the REAL WORKING parts.

The carbon inside the EGR passage tube and the underside of the EGR valve must to clean out.

Make sure you has a NEW EGR gasket before you start the job.

It's a 2-3 hours job.

If you do not clean the EGR passage tube the Nox emission will get higher (check you past emission reports).

Dec 02, 2009 | 1996 Toyota RAV4

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