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What causes an obd2 codes p0401 and p0300 on a 2001 Honda Passport if you already clean up the egr valve and passage how you can fix it?
you can find a good answer in this site: http://www.obd-codes.com/trouble codes/generic/p0401-insufficient-exhaust-gas-recirculation-flow-egr.php EGR First off Your Honda is really an Isuzu Rodeo, but you already knew that. These have the GM electronic egr. if you have the 3.2 motor. The only way to fix it is to replace the egr valve.
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Service engine light on - code p0401 - EGR Sensor - 1999 Sable - Taurus - could be a build up of carbon Can you clean them or must they be replaced?
You can try cleaning it, but in general, most people have found that it needs to be replaced. Although it is probably too late for this particular user, I recently searched… and searched for an answer to the same questions about the p0401 in the late 90's Sable (Taurus) Mine is a 3.0 24 valve Duratec. I am not sure about the process for any other models. tools required: throttle body cleanerpaper towelshard metal wiresocket wrench and a 5/16, and a 10 millimeter deep welldigital camerapatience OK: Here goes. Before you do anything else, do not buy any parts, whatsoever. Get to Autozone...buy some throttle body/air intake cleaner. Detach your negative (most likely black) battery cable (unless you owners manual suggests otherwise) Take a digital picture of how your throttle body looks before you start taking it apart. You will need to know where the various springs reattach. Get yourself a socket wrench, with a 5/16ths, and a deep-well 10 millimeter socket. Take off your air cleaning tube, and make sure you are certain which hoses reconnect to where. once it's off, you'll see a brass plate inside the exposed hold. That is called the throttle plate. There is a lever to the left side that controls when it opens and closes, this lever is attached to a series of springs and a steel cable (the throttle cable). Take off the retention plate for the throttle cable (it will also be valuable to remove the throttle cable from its place, so that you are sure that you have not stretched it out in any way). Then, whip out that 10 mil deepwell, and take off the 3 bolts and one post screw holding the throttle body on. Yes, you are going to clean it, but that comes later, never mind that sticker on the top of the opening that says 'do not clean throttle body,' you won't hurt anything. Take off the throttle body gasket, and do not break it, you will need it later. If it needs scraped off, take a picture of what it looked like for a reference, a discount auto parts store will try to sell you the wrong one, i promise. and that is a whole can of worms in a different story. When you look inside the area revealed by removing the throttle body and gasket, you will see the air intake manifold. See where the egr valve is, looks like it goes into the manifold, right? No, none of those holes that are actually inside the manifold lead to it. Instead, on the face of where the throttle body mounted to the manifold, there is a c-shaped passage-way that has 3 opening that would allow air to bypass the throttle body gasket. remove the egr valve (10 mil as well) and get your piece of hard metal wire. you will have to make a 90 degree turn inside the egr passage to find where its outlet is, but, if you can't get the wire through, that is what is causing your p0401. remove that valve on the top of the air intake passage way (it's your idle air control valve, and you can't go liberally spraying throttle body cleaner into if or you will burn our the little motor at the end). in either case, whether it is completely clogged or not, place a paper towel underneath that c-shaped passage (it took me a while to figure out what people were talking about, mine was solid-black, caked completely with carbon, I didn't even realize it was supposed to be an open channel!!) completely douse it with the throttle body cleaner to break it up a little, and proceed to clean it out with your hard metal wire (a tiny, flat screwdriver might also be helpful, but be careful the cast mold of your air intake is aluminum, and will scratch very easily) repeat as necessary until it is clean, and make sure the passage is open leading to the egr valve (top left of the C). Now you can clean out your throttle body itself. I found it easiest just to spray some cleaner in it, and let it sit. You do not want to scratch the inside of the throttle body. the cleaner, and then a good wiping with some paper towels will do the trick. Get back to Autozone, and bring the throttle body gasket (or picture of it) and order a new one, make absolutely certain that they are the same...remember, can of worms. you don't want what happens with the wrong gasket, it is unbelievably stressful to have your mercury sable station wagon sound like it is ready for the Indy 500. replace all the parts, referencing the first digital pics you took to ensure it's all assembled properly. I would suggest (although it is not necessary) to leave off the clean air tube overnight, and prop a brick on the gas pedal to open the throttle plate, it will allow all the acetone and alcohol from the throttle body cleaner in the a.i. manifold to evaporate. Reattach the clean air tube (if you haven't already) and then reattach your neg. power cable. Start her up...and listen to that kitty purr. just kidding, for a while it will run strange, and unbelievable amounts of smoke will pour out. that's the carbon you cleaned up and the throttle body cleaner burning off. don't stress. Let it idle for a while. An extended strange idle means something went wrong, either a vacuum leak (bad gasket, you could have not reattached a hose) If you took off you neg battery cable, you will find that your SES / CEL light has been reset and is now off. Don't be too confident, this could have only been one of your problems. Drive it for a day or 2, and see if it comes back on. if you get another p0401, then it is 75% certain to be your dpfe sensor. It's back, behind the throttle body, under the a.i. manifold, on the drivers side of the engine. You'll need that 5/16th and alot of blind groping to get it off. The new sensors are shaped differently, so you will also need to get new hoses (which is probably a good practice anyways). the 'ref' hose will need to be at least an inch longer than it was with the factory dpfe sensor. happy times, hope this helps someone. I'd bet you anything it has nothing to do with your egr valve. Hope you didn't waste the cash on a new one yet. Most often a new dpfe sensor does the trick. But in the Fords, depending on the engine, there is also a passageway that clogs up within your intake manifold. If your egr valve mounts onto the front of the intake on the drivers side, i would take the throttle body off and look just in case. If there is excessive carbon build-up, clean it out with some throttle body cleaner, and it might help your problem. Cheap fix, if your patience isn't considered an expense. Good luck. the dpfe sensor might run you 20-30 bucks, and a new throttle body gasket is 99 cents. It means the PCM sees a lack of EGR valve flow. That could be a problem with the EGR, EGR passages, EGR control system, EGR position sensor, wiring, or PCM. Answer p0401 is insufficient flow in the egr. take off your throttle body and clean out the c-shaped passage on the face of the air intake maniflod. if that fails, get a new dpfe sensor. if that fails, check all of your hoses again. If that fails......well....we're getting closer to a bad pcm here....next is the vacum (evr) then the egr vavle itself. best of luck. my 98 sable has the 24 valve durotec 3.0-it was the passage on the face of the a.i.manifold that caused all of my egr problems. Who told you that, a dealer, mechanic? did they check everything first? did they apply vacum to the valve and see if it was faulty? did they replace the dpfe? 60% of late 90's early 00's ford and mercury p0401's are a bad dpfe sensor. 30%are a clogged egr passage after the throttle body in the manifold. 9% are either the valve or the evr vacum. that leaves 1% to be either a leaky hose, or a pcm. check again before you drop bookoo bucks on a pcm good luck mb Answer It has to do with DPFE sensor circuit high voltage detected. EGR temp sensor malfunction. That is all I can find. Hope this helps. I found this: P1401 Differential Pressure Feedback EGR Circuit High Input It is fairly common for this to be a problem with the sensor, not the EGR valve. The message is misleading. Also, it there is a 1400 message with it, it is most certainly the sensor, not the valve. jcjimz The advice above about the passage from the EGR to the throttle body is good. Usually you don't have to replace thr EGR but if you're taking it off replace it any way, it's not expensive. On the 3 liter DOHC Ford, Mercury engines the problem with the EGR is most always the passage through the manifold to the throttle body. Take off the EGR and the throttle body. From the EGR the port makes a hard right to the throttle body that you can not see. On the throttle body side there is a C shaped groove that is on the left of the main large port. It is probably full of carbon. Get a spray can of B-12 Chemtool and clean it out. You will see on the upper side of this groove that there is a small port. This goes to the EGR. Take your B-12 and clean the entire port then spray it into the port to the EGR. Let it sit then spray it again. Take the hose from the B-12 and spray it from the EGR side too. Let it soak. Do this until you get a steady flow of B-12 from the EGR to the throttle body. After weeks of spending money and time replacing things this was the entire problem and have been told by a reputable mechanic that 90% of the time that's the whole problem.
I was looking up the same thing and came across these answers: ... "very well be that the egr valve is coverd in carbon. The carbon is easy to clean with a wire brush if you r…emove the valve.The main cause of malfunction in an egr valve is the carbon build up leaving it stuck open or closed! Simple huh? i have a 99tl that had the same problem. simply remove the intake and clean the carbon from the passages to egr. it not difficult, it took about 15 mins and have not had trouble since, good luck!"
Trouble code P0401 means: EGR System Malfunction Replace the EGR Valve
How do you fix the EGR valve associated with a check engine light error code P0401 on a 1999 Acura 3.2 TL?
It's not the valve. I've never worked on an acura. but it's not the valve. they rarely short out. check the passages, and the vacum pump. hopefully someone with acura experien…ce comes along. good luck. Ok this guy is a clown. I have never worked on an acura either but it may verry well be that the egr valve is coverd in carbon. The carbon is easy to clean with a wire brush if you remove the valve.The main cause of malfunction in an egr valve is the carbon build up leaving it stuck open or closed! Simple huh? i have a 99tl that had the same problem. simply remove the intake and clean the carbon from the passages to egr. it not difficult, it took about 15 mins and have not had trouble since, good luck! Absolutely right! I had a problem where when I drive at a constant speed of 45mph or higher, my '99 Acura TL would behave very weirdly. The engine didn't turn off but even though the car is in DRIVE but still behaved like it was in NEUTRAL, and then it will kick back in and start working again. This happened a lot of times then the check engine light came on. I received the P0401 error code. I bought a new EGR valve from Autozone and replaced it. Works great. However, I do hear a little bit louder noise when the engine starts and I take off, but the Autozone guy told me that it is because there is a lot more air passing through, since the old valve was clogged up. It is fairly easy and quick to change. I love the performance now!
P0401 indicates an insufficient flow of gases through the EGR system. While Honda EGR valves occassionally fail, your first step should be to check if the EGR is operati…ng when vacuum is applied. If so, remove it and clean the orifice with brake cleaner. While you have it off, clean the intake porting with carb cleaner and a stiff wire brush. Carbon build up in either the EGR or the intake will set this code.
Where is the egr valve located on 1998 Honda Passport and how can you correct EGR flow insufficient?
Locate and clean the EGR valveIt is located on the left side back for the engine looking from the front. Once u find it remove the two bolts and pull upward. Remove the gasget… and use Carb cleaner to remove all the carbon deposits inside the EGR valve. This worked for me and i saved 110 dollars by not replaceing it. Works just like new. You might also want to clean out the intake port located in the throttle body. That was my problem. All I needed to do was remove the air intake cover to the throttle body and take a small bristle brush and clean out the exhaust intake. It wasn't getting efficient air intake and that is why my code kept coming up. I just completed the full top end cleaning on a Honda 3.2 L engine. I found it to be a fairly simple task for a home mechanic. The main thing I found was a carbon blockage where the vacuum tube comes out of the back of the intake and goes to the vac solenoid on the left side fuel rail. Easy to clean. just pull the vac tube off of the fuel rail and spray carb cleaner thru to the intake. after I performed the complete upper end cleaning My engine light went out.
What else could be causing the check engine light to be on in a 2001 Mercury Sable that the code read that it was egr valve and have replaced valve?
You made the same mistake I did, and likely replaced a perfectly good egr valve. The "Related Questions" below gathers together a ton of information about this second…ary air / EGR / DPFE and other stuff related to the 401 trouble codes.
EGR System, insufficient flow detected, maybe bad sensor? Your sensor is more than likely fine. It is probably the air intake to the EGR located in the throttle body. Tak…e off the air intake cover and it is right behind the throttle plate. Just clean out the import to the EGR, because it gets clogged up and then the EGR isn't receiving the correct amount of air. Try that before you go spend the money on a pricey sensor.
P0401 indicates problems with EGR system... It might a simple one, for instance, you just need to clean EGR pipe and valve. Or it can be more expansive one like faulty EGR val…ve or EGR sensor. Which one you have impossible to answer without testing the car. And you can use the professional Toyota tool to repair it, I think the Toyota it2 is a good tool for it.
It's located next to the air box by the cam shaft.
I don't have a '98 -- I have a 2000, but I am betting the fix is pretty similar. This was maybe the easiest repair I have ever done. I had a problem a few weeks back where th…e car wasn't starting up very well and it would almost stall at times, particularly when it was low on fuel. The check engine light came on and the diagnosis was a P1404 or P4404 (don't recall) that indicated a problem with the EGR valve. Before I ended up replacing the valve I took it off and cleaned it, replacing the gasket before reattaching. The valve is right up against the firewall slightly to the left of the engine block and has an electrical sensor plug on top. Disconnect the plug and remove the valve by removing the two bolts on either side. I think it's an 11mm. Anyway, once the bolts are out and the plug is disconnected, it should come right off. If it's black and caked with carbon, chances are the EGR is your problem. I've been told it's common with Passports and Rodeos. You can clean it with some brake dust remover and an air compressor or just replace it. If you push down on the valve and it doesn't pop right back up or sticks after you've cleaned it, just replace it - the valve is bad. I put mine back on after cleaning it and it failed again four days later. Probably not a bad idea to replace the gasket either way. A new one is probably around $120 - $150, which is really not too bad. This was seriously the easiest repair I have ever made on any vehicle I have ever owned. It took literally five minutes.
Your best bet it to simple replace it... they are under $20, and they are really easy to do..
Trouble code P0401 means:Exhaust gas recirculation flow insufficient detected
In Asian Cars
u dont reset egr valves if you are talking about the service engine soon light or the check engine light the you need factory scan tool or a aftermarket scan tool Actuall…y you can take the ground cable off for 15 min and if the air flow is right then the light will go off and stay off.
because the intake is probaly clogged up with carbon deposits not letting exhaust gasses back through the intake.
In Ford Taurus
What is the cause of a P1401 obdII code in a 98 mercury sable durotec 24 valve after egr replacement and valve cleaning if the hose from the valve to the vacuum is clean?
It is the c-shaped port between your throttle body and air intake manifold. Remove the throttle body, buy some throttle body cleaner, and scrape it out (it is on the face of t…he a.i.manifold where the throttle body mounted). Make sure that a wire will pass between this area and the egr valve. If you've replaced your dpfe sensor and still haven't cleared the code to pass your emissions test, then this is 99% certain to be the problem. I have another post out there with the proceedure. I'd bet if you searched "p0401" you'll find it. I appologize for not posting the entire process again. it takes some explanation. mb
If you have changed your egr valve and deleted the code and it still reads p0401 egr valve insuffasante flow what do you do now?
You also need to clean the "passages". EGR valve puts exhaust gas back into the engine intake under less than full power situations. When that happens exhaust deposits build u…p on the walls of the passages. Replacing the EGR valve was only half the repair, you also need to clean it out. There is a tube from under the EGR valve to the exhaust manifold. That is probably blocked.