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What are codes P1401 & P1402

Check engine light is on and codes P1401 and P1402

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 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

KCGTODAD
  • 169 Answers

SOURCE: Check engine light on showing a code of P1401

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.

81edf44.gif
Hope this helps and good luck! Thanks for using FixYa!

Posted on Oct 02, 2009

emissionwiz
  • 75817 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

Mustgo
  • 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.


Cheers,

Mustgo

Posted on Dec 19, 2009

powers3
  • 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

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1 Answer

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.

May 17, 2013 | Mercury Villager Cars & Trucks

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My 2003 Hyundai Accent just turned 90,000 miles. I recently got the required tune up & a belt changed (by a family friend). So a few days later my check engine light came on. I went to Jiffy lube for...


P1401=

Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, campaigns, illustrations and procedures, etc.ghost45_58.jpg

Sep 09, 2011 | Hyundai Accent Cars & Trucks

1 Answer

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


No, but check engine light mean emissions control system
fault. Have Honda deal with it because the have the proper
diagnostic equipment and parts to correct the problem. I
wouldn't use after market parts.

Feb 13, 2011 | 2002 Honda Civic

1 Answer

What is check engine light codes P 1401 and P1131?



This is for the P1401
HE - Exhaust Gas Recirculation (EGR) Systems
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This is for teh P1131
H - Fuel Control
' var HIGHmap155714613 = '' // --> 155714613

Jul 18, 2010 | 1997 Lincoln Town Car

1 Answer

Check engine light on showing a code of P1401


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.

81edf44.gif
Hope this helps and good luck! Thanks for using FixYa!

Oct 02, 2009 | 1996 Nissan Altima

1 Answer

P1402


I have had good luck in the past googleing the code with the year, make & model included in the search.

Aug 20, 2009 | 2000 Audi A6

1 Answer

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.

service information
vehicles that have the check engine light illuminated and have dtc p1401, p1402 and p1403 stored in the ecm should have their electrical systems diagnosed related to the appropriate dtc. these codes are not related in any way to an evaporative emission system leak. the conditions that set the diagnostic codes areas follows:
p1401 - dm-tl air pump motor current draw is higher or lower than expected (normal = 17-36 ma).
p1402 - dm-tl air pump motor is shorted or disconnected.
p1403 - dm-tl changeover valve is shorted or disconnected

Jun 04, 2008 | 2000 Hyundai Accent

1 Answer

Computer codes


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.

service information
vehicles that have the check engine light illuminated and have dtc p1401, p1402 and p1403 stored in the ecm should have their electrical systems diagnosed related to the appropriate dtc. these codes are not related in any way to an evaporative emission system leak. the conditions that set the diagnostic codes areas follows:
p1401 - dm-tl air pump motor current draw is higher or lower than expected (normal = 17-36 ma).
p1402 - dm-tl air pump motor is shorted or disconnected.
p1403 - dm-tl changeover valve is shorted or disconnected

perform the suggested repair
1. inspect for water in the dmtl by removing the 90° air inlet elbow and looking into the air chamber. if water or corrosion is present, replace the dm-tl p/n 31440-25500; air filterp/n 31453-25500; and pipe assembly p/n 31454-25500if corrosion is in the pipe. see detailed instructions on page3 for air filter replacement.
2. inspect for underbody coating sprayed into connector m52 at dm-tl. if underbody coating is present on the male or female connector, spray with electrical contact cleaner to remove the undercoating.

air filter (dm-tl) replacement instructions
  1. disconnect the 90° elbow from the top of the dmtl and insert a clean rag into either the elbow or thedmtl inlet connector.
  2. disconnect the dmtl electrical connector.
    1. disconnect the 2 hoses at the front of the canister (caution: silicone hoses tear/puncture easily).
    2. remove canister assembly and dm-tl as a unit (3 mounting nuts).
    3. disconnect the 2 hoses from the metal transfer pipes.
    4. remove the canister, air filter, and metal tube assembly from the canister protector by removing the 3 mounting nuts.
    5. disconnect the hose at the air filter.
    6. remove the air filter mounting nut and remove the air filter.
    7. install a new air filter.
    8. reassemble in reverse order.

Jun 04, 2008 | 2000 Hyundai Accent

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