Question about 1999 Nissan Altima

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EGR Monitor will not reset

I have a 99 altima and it had several codes, after I had 3 different mechanics look at it we decided to replace the intake manifold gasket. That fo=ixed everything except the knock sensor code. I was told by the emissions office it would not fail for just that code, however after 100 miles of driving over 5 days of city and highway the egr monitor has not reset. Until it will pass a monitor ready test I can't get a waiver if there are any more problems. Is there a specific drive sequence needed for this and if so where can I find it?

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Hi Sandy, I'm glad to help!
Sandy just a week ago I fixed a Mitsubishi with the same problem. The EGR Monitor would not set, it turns out the vacuum solenoid that goes to the EGR Valve was bad. I replaced for the lady and it fixed the problem. NOTE: I can't say that is what's keeping your monitor from running. BUT, its a real cheap fix and worth a try, don't you think. Hope this helps and have an awesome day Sandy!

Posted on Jun 30, 2014


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Posted on Jan 02, 2017

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SOURCE: My 1996 Nissan Altima has

Putting miles on them wont reset the computer. It is how many times you cycle the key on and off. And they will only reset if the problem was fixed. I don't know how many times yours has to be cycled, but some vehicles are up to 100 times. Hope this helps.

Posted on Jan 22, 2011

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EGR Monitor will not reset

Hi Sandy, I'm glad to help!

Sandy, If you have an EGR Monitor that will not set then most likely there is something wrong with the EGR System. There are several things that can cause this depending on the vehicle and engine type. (1) Bad EGR Valve. (2) EGR Vacuum Solenoid. (3) EGR Vacuum Solenoid Wiring problem. (4) EGR Flow problem due to restriction from carbon build-up. These things must be addressed one by one and repaired before it will ever run that monitor. To answer your question you can GOOGLE your vehicle year, make and model and engine for monitor drive cycle and it will show you how it must be driven exactly. Hope this helps and have an awesome day Sandy.

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Code P0400 on 99 nissan altima

Hi Kristy,here's a link to your P0400 code.

Apr 08, 2013 | 1999 Nissan Altima

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1996 nissan altima will not rev over 3000 rpm

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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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I have a 99 buick century po401 code came up? I changed the EGR value and the code still comes up?

99% of the time when a egr code is set its not the egr its the sensor.Now i have only replaced a couple of egrs.The only other thing that will case it is clogged up intake ports.You will have to remove the intake to clean.

Hope helps.

Apr 09, 2012 | Buick Century Cars & Trucks

1 Answer


He's right both and the code is the EGR valve. The car won't run with the EGR valve removed but it may be disabled some way. Most of the time EGR vales leak or the senser line stopps up. There's a small medal ine coming up the the EGR senser from the exhaust and connects to the senser this line stops up and the senser knows something aught to be happing and it doesn't so it turns the light on. Your mechanic is right it's not hurting anything but it makes the light on. It can be fixed but it'll not run much different.

Dec 02, 2010 | 1999 Nissan Altima

2 Answers

My check engine light and TCS light came on. Code

P0401: Isufficient Flow Detected in EGR system.
-clean the EGR port with the carburetor cleaner.
-clean the EGR passage inside the EGR valve with the caburetor cleaner.
Reset the light, if the light still coming back, then replace the EGR valve.

Apr 26, 2010 | 2000 Honda Accord

1 Answer

I have a 99 monte carlo with a 3.1, the check engine light came after I had changed the wires and plugs about a month ago, the code came back as p0401 egr insufficient air flow,I bought a new egr, gaskets,...

Remove the air tube to the throttle body. Open the throttle all the way and look inside with a flash light. You are looking for a lump of carbon at the egr port int the intake manifold.

Remove the egr valve, using a hanger or stiff wire, clean out the egr port removing the carbon from the intake manifold.

Sep 06, 2009 | 1999 Chevrolet Monte Carlo

1 Answer

Whate is code 1400 and 400 in nissan altima 2001. What does it mean when you get code for egr? How does it affect car?

P1400 DPFE Circuit Low Input
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These codes represent a fault in the Auxiliary Emission Controls. Here's a brief describing of the EGR valve. The EGR stands for exhaust gas recycling valve. During cruising speeds, the valve opens allowing exhaust into the intake manifold. The purpose of this is to cool the temperature of the combustion inside the cylinder as the spark plug fires. This in turn, lowers emissions. If the EGR is stuck in either direction(open/closed), it can effect the idle of your vehicle and can stall it out at times. it can also trip the engine light as well. Good rule of thumb is to clean out the carbon out of the intake manifold thoroughly before you install a new EGR. this will prevent the engine light form coming on once more. if the carbon build up is high, chunks of it will jam the EGR, causing it to fail over and over.

Please rate and god bless.

Mar 26, 2009 | 2005 Nissan Altima

1 Answer

Low flow Egr check engine light

You need to pull your plenum and more than likely the intake and clean out the vaccum port in the intake where the egr pipe connects to the back of the intake.Not sure if you can do it with just pulling the plennum or not though.Having the same prob with my 96 rl.Keeps kicking the insufficient flow to egr valve code at about 30 miles.

Jan 06, 2009 | 1996 Acura RL

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