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Obd2 codes 2000 nissan maxima trouble code p0402, exhaust tone also sounds a little different and car gets bad gas mileage

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Po402 is egr flow excessive, remove and clean carbon out of valve. or replace it.

Posted on Jun 25, 2010


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DTC P0402: Exhaust Gas Recirculation (EGR) Flow Excessive

The engine control module (ECM) tests the exhaust gas recirculation (EGR) flow when the EGR is in operation. EGR desired flow is compared to EGR actual flow. If EGR flow is higher than expected DTC P0402 will set.

Do you know what EGR is ?

Nov 14, 2017 | Cars & Trucks

1 Answer

Had a smog test done got a P0402 code.And had a very bad tune-up changed spark plugs wires filter oil change, plugs stuck, oil was black, could that be the cause of the P0402 code, exhaustive gas flow Please go here for a detailed account of the cause. God-Bless!

Oct 12, 2016 | 1996 Ford Explorer

2 Answers

99 maxima ran till it was parked now it turns over will not start gave code p0400 any ideas

The fault is somewhere around the EGR valve - probably the EGR valve or the throttle position sensor.

Before replacing any sensors try removing and cleaning the EGR.

Here's a Youtube link that may be of help to you:

1999 maxima egr Google Search

This link explains about the EGR:
P0400 Exhaust Gas Recirculation Flow Malfunction

CEL code P0400 EGR Flow Malfunction

Mar 27, 2016 | Cars & Trucks

1 Answer

My 2000 nissan maxima se has a misfire i can hear it through the exhaust and when im driving. say i put on the gas hard and let off, it will make a loud kinda of reving noise. it had 300k miles on it when...

The most likely problem is with the signals the pcm is getting from the crankshaft or camhaft position sensors. The problem could be the sensor itself, the tone ring that spins next to the sensor, or the wiring. Inspect the wiring and connectors, tone rings, and sensor installation carefully. If visual looks good, there are some tests you can run at the link below.


Repair Guides Components Systems Crankshaft Position Sensor AutoZone com

Sep 23, 2017 | 2000 Nissan Maxima

1 Answer

How to fix a p1401 trouble code on a 1996 nissan maxima?

From what I see it is the Exhaust Gas Return Temp Sensor (EGR Temp sensor)

Jun 24, 2012 | 1996 Nissan Maxima

4 Answers

Grand carvan gives p402 code

This is not a cut and dry fault code. This means that more than one thing wrong can set the code in the computers memory. Here is the low down on the P0402 fault code. This is from the OBD2 fault code diagnostic book.

P0402 - Exhaust Gas Recirculation Flow Excessive Detected
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine hesitation
Possible causes - EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Dead (Weak) battery
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
- Exhaust gas leaks

Jan 18, 2012 | Cars & Trucks

1 Answer

Obd2 code is po402 exhaust gas recirculation flow detected.

That code P0402 translates into 'EGR flow excessive' which implies that the diaphragm of the EGR valve is probably bad and this would mean that exhaust gases are being drawn into the intake manifold when the engine can't handle them. This would result in poor power at the low end (a least) and higher fuel consumption. Normally at idle, the EGR path from exhaust to intake is blocked so it doesn't gag the engine and is opened when vacuum is higher and the engine is not loaded very much. This controlled intake of exhaust gases is claimed to help burn unburned fuel before reaching the catalytic converter.
By cheating the vacuum line, I pick up a couple of MPG since the engine is not choking on its own garbage.
Illegal? Probably, but I drive little anymore so I suspect Gore's hot air is a greater contributor to 'global warming' than I.

Jun 19, 2010 | 2005 Volkswagen Jetta

4 Answers


I have a 1996 ford f150 4.9 liter.The truck runs great but bad gas mileage.the only problem is i am getting codes p0401and p0402 what should i do.

Oct 14, 2009 | 2000 Ford Windstar

1 Answer

Problem with my vehicle

You need to replace the dpfe sensor this will fix it.

Jul 10, 2008 | 2001 Ford Taurus

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