Question about 2000 Chevrolet Malibu

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I need to know what these codes mean

I scaned the computer and got these codes. p0401 cnf, p0404 cnf, p1404 cnf and p0401 pnd. what do they mean?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

j_del
  • 1586 Answers

SOURCE: disgnostic code meaning

P0404 Exhaust Gas Recirculation Control Circuit Range/Performance
P0405 Exhaust Gas Recirculation Sensor “A” Circuit Low


It sounds like you have a failure of the EGR valve.

Posted on Sep 28, 2008

ourhowse
  • 2007 Answers

SOURCE: 1998 Chevy Truck 1/2 ton 350 engine. Trouble codes

404 is exhaust gas recirculation circuit, and 405 is exhaust gas recirculation sensor circuit low. EGR sensor or ground?

Posted on Nov 13, 2009

Mustgo
  • 2359 Answers

SOURCE: 1998 Chevy Tahoe with P0404, P0405, and P0430 Trouble Codes

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

SOURCE: want to know about engine

You have an O2 Sensor Code & a couple of EGR
Codes

I would guess the EGR issues are setting the O2 Code

Posted on Apr 01, 2011

airjer995
  • 5332 Answers

SOURCE: I can not find EGR

The EGR valve is located on the firewall side of the throttle body.

airjer995_68.jpg

Posted on Apr 26, 2011

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