Question about 1997 Ford F150 Regular Cab

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Code 401 comes on when checking codes

Engine light comes on

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This is an airflow problem. Usually thought to be a EGR valve problem but the problem is the sensor not the valve. With OBD 2 you should have a DPFE sensor. (Delta Pressure Feedback EGR) that is a silver box with 2 hoses coming off the bottom that connect to the egr tube. That is the problem. Replace the sensor and your P0401 (that is the correct way to write the code as the P stands for Powertrain) will go away. The new updated DPFE sensor will be plastic and will probably require an updated connector. The connector should come with the updated sensor. And please use Ford Sensors.
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Posted on Jan 21, 2009

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How to fix code 401 on Montero 2000


Code 401 (P0401) indicates improper flow in the EGR. This type is vacuum operated. There is a good chance the vacuum line is leaking. Check the vacuum line ( a black rubber hose ) for dried areas, cracks or holes and that it is connected to the steel tube coming from the EGR. The bad areas are usually toward the engine and cannot be seen without removing the hose. Your hands will get a lot of black soot like stuff on them. Hose is 50 cents. See the image of Montero EGR. f627939d-37cb-470b-8115-ae3187949d96.jpg

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Recirculation exaust gas detected code po 401 2.2 camry auto.... switch?


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PLEASE RATE THIS REPLY FOR ACCURACY

Mar 23, 2013 | Cars & Trucks

1 Answer

My check engine light comes on then it start to blink once I start driving, 1997 town car. 4.6


You need to have the car scanned. It is a free service at Autozone,Advance, or Oreilys autoparts. Then the clerk can tell you some of the possible parts you need. If you get the Code numbers, we can tell you what the onboard computer is telling you.

Be careful if it is a Code 401, for that engine the scan can be wrong. If 401 comes up, it can be a clogged EGR port in the Intake manifold.

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Hi there i have 1997 Avalon V6 . the check engine light up # 138 and 401 so can you tell me the name of that two please thnks


Trouble codes are normaly 4 digits with a "P" or "B" before it. I am gonna assume that you meant P0138 and P0401:
P0138 is Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2)
P0401 is Exhaust Gas Recirculation Flow Insufficient Detected

A code P0138 may mean that one or more of the following has happened:
  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure (not as likely)
Possible Solutions Here are some potential solutions:
  • Replace O2 sensor
  • Repair short to battery voltage in o2 sensor signal circuit
for info on the P0401:
http://www.obd-codes.com/p0401

Jul 10, 2011 | 1997 Toyota Avalon

1 Answer

230,000 MILES...CHECK ENGINE AND TCS POP ON. READ ON-LINE TO RESET AND TCS SHOULD GO OFF...IT DID. READ ABOUT P0 401 CODE. LOCAL HONDA DEALER REPLACES FOR $444. IN MIDDLE OF WYOMING ON ROAD TRIP...DID...


Yes you did

PO 401 -- is an egr valve, you could have
bought when you got home, at the local auto
parts store for $90.00 & installed yourself

You never clear any codes or dash check lights
They are used to look up codes & diagnose
OBD2 System issues.

NOTHING goes away.

Those dash lights have been on all
vehicle for 30 years & indicate you have
a sytem malfunction somewhere.

May 22, 2011 | Acura CL Cars & Trucks

1 Answer

Check engine code#401


Your 401 code relates to the EGR system, vacuum hose leaks are more common for code setting. Also check vacuum modulator as they are known to faile more often than egr valve. If all check out o.k. and there are no exhaust leaks, suspect e.c.m. (computer) problem.
You may just want to check your gas cap also and make sure there is not any air coming through or it will throw off the sensor. Just a quick cheap check. (You may need to change it)

Feb 17, 2011 | 1994 Toyota Corolla

1 Answer

Trouble codes 171, 174, 137 & 401 came on after engine replacemen


did they ever reflash the ecm with the new codes for the motor

Mar 09, 2010 | 2004 Mitsubishi Endeavor

1 Answer

Engine check light, code 401 low egr vacum egr


The EGR and the lift sensor may look perfect from the outside but the under side of the EGR valve and the EGR passage (small tube) are the REAL WORKING parts.

The carbon inside the EGR passage tube and the underside of the EGR valve must to clean out.

Make sure you has a NEW EGR gasket before you start the job.

It's a 2-3 hours job.

If you do not clean the EGR passage tube the Nox emission will get higher (check you past emission reports).

Dec 02, 2009 | 1996 Toyota RAV4

1 Answer

I HAVE A CODE#402-401 CHECK ENGINE LIGHT...I BELIEVE ITS PART OF THE EXHAUST SYSTEM?...IF IM WRONG PLEASE ....I NEED HELPPPPPPPPPP


i believe it's a egr system code
I got a 406 witch is egr flow sensor A high voltage
I hope that helps your search

May 10, 2009 | Oldsmobile Achieva Cars & Trucks

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