Question about 2001 Honda Odyssey

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P1491 Code I've researched elsewhere on the intranet, and found the following answer. I am taking my 2000 Odyssey (90,000mi) into the dealer tomorrows to get it checked out: "The P1491 EGR insufficient lift is a product problem with that vehicle and has to do with carbon build up on the egr passage that is preventing the flow of spent exhaust gasses through the Exhaust Gas Recirculation System. Honda has a repair kit that includes a new EGR valve and an EGR tube that will fix that problem. Basically, the EGR isn't working because the flow of gas into the engine is blocked by carbon deposits. Honda did extend the warranty on that part but your car is beyond the terms of the warranty extension. Still, you may what to talk with your Honda dealer to see if you can get honda to pay for it as "goodwilll". The misfire codes (P03xx) can be related to the EGR valve or the misfire can be caused by the overly rich mixture. Its somewhat confusing as the cylinders indicated by the 0304 (cylinder 4) 0305 (cyl 5) and 0306 (cyl 6) indicate misfires on two separate banks. EGR affects both banks, so it is probably due to that. As for the TCS light coming on, the way that the Traction Control System works is that if the wheel speed sensors detect one drive wheel spinning much faster than the other it determines that the wheel is slipping and it cuts out cylinders in the engine to reduce engine torque and restore traction. The TCS system is seeing that the engine cylinders are cutting out (misfires) and is 'fooled' into thinking the car is in TCS mode so it puts the light on. The TCS light then is just a confirmation of an engine misfire. so, what do I think is going on? First the EGR needs to be replaced for the P1491. That may fix the misfires and there is an outside chance it may be responsible for the overly rich condition as a functioning EGR valve will lean out the fuel mixture and one that doesn't work will cause the mixture to be overly rich. So, start with the EGR replacement through Honda (of course, ask them to pay for it!) The EGR will probably fix the TCS light "problem" as well."

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SOURCE: How do you clean the EGR valve on a 99' Honda Civic?

Pull vacuum on egr valve with engine idling and see if engine stumbles and tries to die until vacuum is released. If this DOES NOT happen the egr exhaust passage is plugged will need to remove egr valve assembly and remove carbon from passage into cylinder head.

Posted on Mar 29, 2009

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2 Answers

CHECK ENGINE LIGHT ON.


remove the EGR valve and clean the carbon from the port it is connected to, they are known to get clogged up, you may also have a bad egr valve.

Oct 25, 2012 | 2000 Honda Accord

2 Answers

Where is the relay located for the code P1491? On a 2000 jeep grand Cherokee?


Hi there:
DTC P1491 - RAD FAN CONTROL RELAY CIRCUIT

DTC P1491 is for the cooling fan relay control circuit as you've found already. Start by checking the fuse for the fan relay. Its in the box under the hood, a 40 amp fuse.

If you've got a couple jumper wires, you can unplug the fan connector and carefully jump the fan to see if it works. The fan connector is on the right side of the back of the fan shroud. Unplug it and jump the black wire to ground and the green to positive. You've got to be very careful doing this though-you are in very tight quarters, its not hard for your jumper wires to touch each other in the connector and short together, and if you use small diameter jumper wires they will get hot quickly when the fan comes on.

If the fan doesn't come on when you jump it, or if it runs slow or sounds bad, you've got a bad motor and will need to replace the fan assembly. One thing that does happen somewhat often, is a bad fan motor will burn up the relay. If the fan motor is drawing too much current it will overload the relay and burn it up. This is why its so important that if the fan motor runs slow or makes noise that you replace it, or you may end up burning up relays frequently.

If the fan runs and the fuse is good, its very likely you just need a fan relay. This is a pulse width modulated relay, not the on/off clicker type you'd find in the fuse box. This unit is capable of infinite speed control. It gets very hot in operation, so its mounted to the body sheet metal to allow heat to dissipate through the sheet metal. The relay is mounted under the right headlamp held down with two 8mm screws. To get to it you have to remove the front bumper cover and headlamp bracketry to access the relay. These relays are pretty common.

Check and test this possible causes:
radiator fan ctrl rly circuit wire harn intermittent defect
radiator fan ctrl rly circuit wire harn observable defect
radiator fan relay ground circuit open
rad fan relay control circuit open
radiator fan relay control circuit short to ground
rad fan control relay defective
PCM defective

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Dec 19, 2011 | 2000 Jeep Grand Cherokee

1 Answer

I took my 2000 Odyssey into the dealer to check the transmission. They found that the idle error control valve was bad, even though the van had been idling just fine. We declined repair, since we were...


I assure you they probally picked up on the problem while checking the trans. they would've used the Honda scan tool and checked any engine malfuntions before evaluating the transmission. you can, however, clean the idle/air control valve by removing it from the throttle body and using some air-intake cleaner on it. the cleaner is available at local parts stores. you may also want to clean the throttle plate with the cleaner to insure it is not sticking to cause the idle problem.

Jul 28, 2011 | 2000 Honda Odyssey

1 Answer

2001 honda odyessy has the following trouble codes: P1491, P0401,P1739. It has also been turning over longer before starting and has cut off while in park and idling. What does this mean?


P1491= "exhaust gas recirculation valve insufficient lift."
P0401= "exhaust gas recirculation insufficient flow"
P1739= ""3rd clutch pressure switch" (automatic transmission code)

the exhaust gas recirculation (EGR) valve is vacuum operated. there may be a vacuum line that is broken or leaking or become detached from the EGR valve. any vacuum leak will cause the engine to run lean, leading to poor starting and idle cut-off due to lean fuel fuel mixture.

The EGR valve has a vacuum diaphragm inside it. this diaphragm could be leaking. the EGR valve will need to be replaced if this is the case.

The P1739 code shows that a problem with the 3rd clutch pressure switch or the wiring leading to the switch has been detected. It may be an intermittent fault. Reset the trouble codes and drive for a while and see if this code returns. If so, check the wiring and switch operation of the 3rd clutch switch.

Jan 31, 2011 | 2001 Honda Odyssey

1 Answer

I replaced EGR valve twice one infact today with dealer part but still the check engine light came on after driving my 2000 Honda odyssey van for 25 miles? any suggestions?


I had an egr code. there is a honda service bulletin out about clogged egr ports. The service bulletin involves putting some kind of sleeve in the port. I just followed the service bulletin to clean out the port, I didn't put in the sleeve or any parts. Seems to be working good for the last six months. It took a couple of hours and some gaskets for the intake manifold.

Sep 23, 2010 | 2000 Honda Odyssey

1 Answer

2002 honda odyssey code p1491


DTC P1491 - "EGR Valve Lift Insufficient Detected" is most often caused by a broken vacuum line going to the EGR valve. So I would check all the vaccum lines to be sure they are tight and not broken. Funny thing about vacuum lines, they never break out in the open, always behind or under something. Best way to check them is to remove them one at a time so you don't get mixed up and check them over carefully. If the vacuum lines are good, you will need to check the electronics that operate the EGR system. It is an involved procedure, much too long to include here. Go to the library, in the Reference section, and get the Motors Import Service manual. That has the complete, step by step, procedure for checking the system. Or you can get a DIY subscription to Alldata which also has the complete, step by step, procedure.

Apr 27, 2010 | 2002 Honda Odyssey

2 Answers

Tcs light and engine check light on my 2000 honda odyssey


I had the same code/symptoms a few weeks ago. Dealer did a nice job checking through all the details. Replaced the egr too, but no improvement. Finally found one cylinder not firing correctly (not the same pressure as the other cylinders.) Dealer did a value clean/adjustment, for about $250, and the problem has been gone for about a month now. We are also getting about 15% better mileage.

Hope this helps.

Aug 03, 2009 | 2001 Honda Odyssey

1 Answer

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Probably worthwhile to take this one to the dealer. I think it would be a quick fix by them

Jul 07, 2009 | 2000 Honda Odyssey

1 Answer

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