Question about 1996 Nissan Altima

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Check engine light on showing a code of P1401

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  • lightinme217 May 11, 2010

    Here is a list of all your codes for your car. Hope this helps. P0000 -No Self Diagnostic Failure Indicated

    P0100 - MAF Sensor

    P0105 - Absolute Pressure Sensor

    P0110 - IAT Sensor

    P0115 - ECT Sensor

    P0120 - TP Sensor

    P0125 - ECT Sensor

    P0130 - P0134 - Front HO2S

    P0135 - Front HO2S Heater

    P0136 - P0140 - Rear HO2S

    P0141 - Rear HO2S Heater

    P0170 - Fuel Injection System Function

    P0171 - Fuel Injection System Lean

    P0172 - Fuel Injection System Rich

    P0180 - Tank Fuel Temperature Sensor

    P0300 - Multiple Cylinder Misfire

    P0301 - P0304 - Misfire, Cylinders 1 - 4

    P0325 - Knock Sensor

    P0335 - CKP Sensor

    P0340 - CMP Sensor, Detectable & Non-Detectable Circuit

    P0400 - EGR Function

    P0402 - EGRC-BPT Valve

    P0420 - TWC Function

    P0440 - EVAP System Small Leak

    P0443 - EVAP Canister Purge Volume Control Solenoid Valve

    P0446 - EVAP Canister Vent Control Valve Circuit

    P0450 - EVAP System Pressure Sensor

    P0455 - EVAP Gross Leak

    P0460 - Fuel Level Sensor (Slosh)

    P0461 - Fuel Level Sensor

    P0464 - Fuel Level Sensor/Circuit

    P0500 - VSS

    P0505 - IAC-AAC Valve

    P0510 - CTP

    P0600 - A/T Communication Line

    P0605 - ECM/ECCS Module

    P0705 - PNP/Inhibitor Switch

    P0710 - ATF Temperature Sensor

    P0720 - VSS

    P0725 - Engine Speed Signal

    P0731 - A/T 1st Signal

    P0732 - A/T 2nd Signal

    P0733 - A/T 3rd Signal

    P0734 - A/T 4th Or TCC Signal

    P0740 - TCC Solenoid Valve

    P0744 - TCC Solenoid & Valve Function

    P0745 - Line Pressure Solenoid Valve

    P0750 - Shift Solenoid Valve ??A??

    P0755 - Shift Solenoid Valve ??B??

    P1105 - MAP/BARO Switch Solenoid Valve

    P1126 - Thermostat Function

    P1148 - Closed Loop Control

    P1320 - Ignition Signal

    P1336 - CKP

    P1400 - EGR & Canister Control Solenoid Valve

    P1401 - EGR Temperature Sensor

    P1402 - EGR System

    P1440 - EVAP System Small Leak

    P1441 - EVAP Vacuum Sensor Leak

    P1444 - Purge Volume Control Valve

    P1446 - Vacuum Cut Valve

    P1447 - EVAP Purge Flow Monitor

    P1448 - Vacuum Cut Valve

    P1464 - Fuel Level Sensor/Circuit

    P1490 - Vacuum Cut/Bypass Valve

    P1491 - Vacuum Cut Valve Bypass Valve

    P1605 - A/T Diagnosis Communication Line

    P1705 - TP Sensor

    P1706 - Park/Neutral Position Switch

    P1760 - Overrun Clutch Solenoid Valve

    P1900 - Cooling Fan



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  • 169 Answers

Hello! That DTC indicates a fault in the EGR temperature sensor. It is located on the intake side of the engine, between cylinders 3 & 4. See picture below. You should check for any loose connection, damaged connection or damaged wires. If none, it will need to be replaced.

Check engine light on showing a code of P1401 - 81edf44.gif
Hope this helps and good luck! Thanks for using FixYa!

Posted on Oct 02, 2009


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Posted on Jan 02, 2017

  • 75 Answers

SOURCE: Renault Grand Espace 3.0 dCi,

The P1401 means you EGR ,exhaust gases recirculation is partially blocked.You need to access it and clean it.

Posted on Feb 18, 2011

Testimonial: "Answer was what I expected having researched as far as poss on my own. Well done, thanks."

  • 691 Answers

SOURCE: check engine light with code p1401

Recirculation (EGR) valve codes. The Differential Pressure Feedback EGR (DPFE) sensors on these vehicles have a high failure rate. Ford now uses a redesigned DPFE sensor. In effect, since the failure rate is so high, if you get this code, replace the sensor and retest. When the DPFE Sensor starts failing, it gives the PCM bad information. The DPFE Sensor is less sensitive, and the PCM thinks less recirculated gas is being burned than is actually so. Trying to compensate, the PCM opens up the actuator too much. This excessive amount of EGR combined with the air coming in via the throttle body leans out the fuel mixture, causing a lean misfire, which is the "stumble" or "hesitation" that is common as the DPFE Sensor fails. The DPFE sensor in the Focus is not very robust, requiring frequent (every 30k miles or sometimes less) replacement or a work around. Note that complete DPFE sensor failure is a very slow process, and the check engine light won't come on until the DPFE sensor is pretty much done for. If you're experencing stumble or hesitation while cruising, and think that it might be related to DPFE sensor failure. If the stumble goes away, then your DPFE sensor is more than likely failing. Of course, replacement of the bad DPFE sensor is the official recommended fix for this problem.

Posted on Jul 29, 2009

  • 78257 Answers

SOURCE: My Check engine light comes on even after the

Ford:DTC P1401 Differential Pressure Feedback EGR Circuit High Input
did you do the pin point testes? a fault code only tell s the sensor signal has a problem, that can be the actual sensor or the connector, or the wiring or the powertrain control module, with this sesor you can also hook the hoses up wrong and excessive exhaust back pressure can cause this as well.

Posted on Nov 03, 2009

  • 2359 Answers

SOURCE: code P1401

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.



Posted on Dec 19, 2009

  • 158 Answers

SOURCE: I have a hyundai accent 2002. The check engine

Diagnostic: "module Tank Leakage (DMTL) Failure"

Probale cause:

1) Open Or Short Circuit Condition

2) Poor Electrical Conection

3)Faulty DMTL Module Faulty

Read more: Call your service dept on the phone as I have heard they dont use the code...better call dealership for free and find out. Hoped I helped you in the right direction

Posted on Feb 23, 2011

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Check engine light comes code p1401

Code 1401 is for a problem with the EGR temp sensor. The sensor and circuits would need to be checked.

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Check engine light comes code p1401

Hi Abe, I'm glad to help!

P1401 is an EGR fault code: Differential Pressure Feedback EGR Circuit High Input. This can be caused by several things. EGR Valve is bad, Flow through the valve is restricted due to carbon build-up. Electrical connector OR wiring is damaged somewhere. Check the wiring and the connector at the EGR valve if no damage is found then replace the EGR valve and clean the port holes in the engine and the EGR tube that's running to the valve "IF IT HAS ONE". Clear the codes and drive it and see what happens. Hope this helps and have an awesome day Abe.

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Stop, DO NOT replace expensive parts or O2 sensor! Ford Explorer codes p0174 , p0401 , rough idle and check engine light on. First thoroughly check all of the hoses and elbows connected to the intake and EGR (vacuum system) for splits, cracks, holes or tears, this could quickly cause these codes and fixes for less than $10. Check all connectors and the EGR valve sensor it could have a crack as well, inspect thoroughly because a split sensor could appear attached to the vacuum hoses but hoses could just be sitting there not actually attached due to a split or crack. This was my problem replaced the EGR valve sensor and the two little vacuum hoses attached to them for $50-60 with in stock parts at the local parts store. Took less than 10 minutes to replace and is easily accessible, the check engine light turned off immediately without having to reset the codes by disconnecting the battery, idle became normal and fuel efficiency better. If you have THOROUGHLY inspected every hose, connector and elbow and found no issues, clean the MAF with electrical contact cleaner ( let dry) and clean the EGR with carbon cleaner. A dirty MAF or EGR could also cause these codes to pop up. If this still doesn't work, then consider replacing the EGR, if that isn't it then try the O2 sensor. Good luck!

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Auxilary emissions controls

OBD2 fault codes have no cut and dry fix for every car that has it in memory. Here is the general info on the code. This code refers to the EGR valve back pressure sensor called the "DPFE" sensor
P1401 - DPFE Circuit High Input
Symptoms - Engine Light ON (or Service Engine Soon Warning Light) Possible causes
  • DPF EGR circuit open.
  • VREF short to PWR.
  • Damaged DPF EGR sensor.
  • DPFEGR circuit short to PWR.
  • SIG RTN circuit open.
  • Damaged PCM.
  • Possible solution A DPF EGR PID reading greater than 4.5 volts with the key ON and engine OFF or running indicates a hard fault.

    Jan 21, 2012 | Cars & Trucks

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    Orange engine light on and off at random. have 2 codes saying P1401 & P1237. Any idea what the codes mean?

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    What is check engine light codes P 1401 and P1131?

    This is for the P1401
    HE - Exhaust Gas Recirculation (EGR) Systems
    ' var HIGHmap155714728 = '' // --> 155714728

    This is for teh P1131
    H - Fuel Control
    ' var HIGHmap155714613 = '' // --> 155714613

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    My Check engine light comes on even after the replaced part for code p1401 on a 2001 Ford Ranger. Any help would be appreciated. Thanks Ed

    Ford:DTC P1401 Differential Pressure Feedback EGR Circuit High Input
    did you do the pin point testes? a fault code only tell s the sensor signal has a problem, that can be the actual sensor or the connector, or the wiring or the powertrain control module, with this sesor you can also hook the hoses up wrong and excessive exhaust back pressure can cause this as well.

    Nov 03, 2009 | 2001 Ford Ranger Regular Cab

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    2000 Hyundai Accent

    00-30-001 2000 ACCENT DMTL DIAGNOSIS: DTC CODES P1401, P1402 AND P1403

    p1402 - dm-tl air pump motor is shorted or disconnected.

    2000 model year accent is equipped with a new enhanced evaporative emission system. this new system is capable of measuring leaks as small as 0.020" diameter. the new system pressurizesthe evaporative emission system with a diagnostic module for tank leakage (dm-tl), while the previous model's system appliedengine vacuum through the purge valve to detect system leaks.

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