Question about 2002 Mazda Tribute

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CodeP00400fornissan failed smog then check engin light scaned codeP00400 came on said egr flow is it the egr valve or sensor? nissan 200SX 1.6 1996

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  • Mazda Master
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Fault codes have 1 letter in them and 4 numbers from 1-9 after the letter. Please recheck and repost..

Posted on Apr 19, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

emissionwiz
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SOURCE: check engine light 1999 Mazda Protoge 1.6l engine

read this article, it explains that you have plugged EGR gas passages, the valve is not the problem, but read the link.

http://www.asashop.org/autoinc/sept2002/techtips.htm

Posted on May 14, 2009

  • 47 Answers

SOURCE: Check Engine light code 1506

this code indicates under-speed error has ocurred.
sets when PCM detects idle speed is 100 RPM lowerthan expected for 14 sec while break pedal depressedand steering wheel is straight ahead.

possible causes: IAC valve failure,intake leak,throttle body failure,opens or shorts in wiring between IAC and PCM.

Posted on Sep 16, 2009

  • 299 Answers

SOURCE: Failed TN emissions testing. 1996 Mazda

the computer needs to be reset by performing a code erase then drive 500 miles

Posted on Sep 23, 2009

  • 174 Answers

SOURCE: egr valve keeps failing

That would be my diagnosis as well. Have someone follow you while you're driving it. Many times a vehicle with a failing cat. converter will smell like sulfer or rotten eggs to someone driving behind them.

Posted on Nov 10, 2009

Mustgo
  • 2359 Answers

SOURCE: engine malfunction

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Posted on Dec 19, 2009

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2 Answers

My nissan altima 1999 did not pass the smog test due to "high emission", it also does not have the check engine light on or give any obd codes. What could be the problem?


Robert, High emissions usually mean the EGR valve and several hoses and other smog components are clogged up. There is no easy fix, you have to get the shop to check through the smog system on your car if you cannot do it yourself. Type of driving, short runs, high miles, burning oil etc all contribute to the engine giving a dirty reading. It may not be enough to light the lamp but it'll be dirty enough. Of cause, it may be the lamp is bust as well? Does it test light when you start up?

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Code 401 is for EGR flow insufficient.
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PO402--EGR Flow Excessive Detected

There are other components besides the
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01 Ford Expedition. Check Engine light and failed Smog check.


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I am having trouble getting my check light to go off after I had it checked and the EGR valve was replaced. The light comes back on after about 15 miles of driving and the code reads EGR poor flow. I can...


Insufficient EGR Flow Detected

Possible Causes:
DPFE sensor signal circuit is shorted to ground
DPFE sensor VREF circuit is open between sensor and PCM
DPFE sensor downstream hose off or plugged
DPFE sensor hoses both off, loose or damaged
DPFE sensor hoses connected wrong (reversed)
EGR orifice tube is damaged or restricted
PCM has failed
And what sets the code is…….Engine started, engine running in closed loop under steady cruise conditions, and the PCM detected the DPFE sensor input indicated insufficient EGR gas flow. Run the KOER Self-Test, and if DTC P1408 is present, the fault is currently present. This code sets in 2 Trip(s). The light will stay on until the cause is repaired. A bad EGR valve is only on possible cause.

Hope this helps,

Dave

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Car wont rev past 2500rpm


that maybe what the rev limiter is set for.That way you can not over rev causing engine damage.

Sep 12, 2008 | 1996 Nissan 200SX

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