Question about 2003 Hyundai Santa Fe

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Code po401 scand code po421@ po401

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A code P0401 most likely means one or more of the following has happened:

  • The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (tube), most likely carbon buildup
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum
Possible SolutionsIn fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM'scode po401 - icon1.png & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • Replace the DPFE sensor (with a good quality / OEM one)
  • Replace the EGR valve

Posted on Nov 05, 2012

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1 Answer

P0455,po421


code p0455 refers to evaporative emission control canister purge valve-short circuit.===Causes wiring short circuit---EVAP---canister purge vakve---ECM
code po421 refers to Warm up catilic converter, bank 1 efficiency below threshold===Causes --catalytic converter---wiring---HO2S 2 (oxygen sensor 2)

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Po421


po421 catalytic converter code [warm up catalyst efficiency below threshold bank 1] means the o2 sensor is detecting low oxygen in exhaust problem can be cat conv going bad---o2 sensor faulty-and or bad spark plug ....as to the p0441 evap system[-evap emissions control system incorrect purge flow ] this is a system code meaning any part of the evap can have problem will need to check the fuel lines vapor lines for damage or breaks-check purge valve -purge valve solenoid- canister- and vacuum lines

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Where should i find this sensor P0342?


EXHAUST RELATED ERROR CODES

There are 711 possible PO generic DTC error codes. Only 7 of the 711 codes are exhaust related.

PO401: Insufficient EGR Flow

PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected

PO410: Secondary Air Injection System Malfunction

PO420: Catalyst System Efficiency Below Threshold (Bank 1)

PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)

PO430: Catalyst System Efficiency Below Threshold (Bank 2)

PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)

THINGS TO ASK YOURSELF OR YOUR CUSTOMER

Have there been any driveability or performance issues with the vehicle, have there been any recent repairs or tune-up work performed, if so was the check engine light reset and were the codes recorded on previous repair orders.

Do not rely on scan tool data alone. In most applications, the customer will have the check engine light reset prior to repair. If the original cause of converter failure is intermittent, only the catalyst failure code may show up (masking the original reason for converter failure).

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What does a po430 code mean on a mercury cougar


EXHAUST RELATED ERROR CODES

There are 711 possible PO generic DTC error codes. Only 7 of the 711 codes are exhaust related.

PO401: Insufficient EGR Flow

PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected

PO410: Secondary Air Injection System Malfunction

PO420: Catalyst System Efficiency Below Threshold (Bank 1)

PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)

PO430: Catalyst System Efficiency Below Threshold (Bank 2)

PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)

THINGS TO ASK YOURSELF OR YOUR CUSTOMER

Have there been any driveability or performance issues with the vehicle, have there been any recent repairs or tune-up work performed, if so was the check engine light reset and were the codes recorded on previous repair orders.

Do not rely on scan tool data alone. In most applications, the customer will have the check engine light reset prior to repair. If the original cause of converter failure is intermittent, only the catalyst failure code may show up

Nov 04, 2012 | Cars & Trucks

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2003 Mazda MPV diagnostic code 421. Previously had codes PO134, PO131, PO151, PO171, PO174, PO401, & PO121. The hose the air filter and the throttle was broken, and tha engine would not start. I...


Hi


Please check the link to get a detailed idea about the code:-


http://www.obd-codes.com/p0421


Please get back to us if you have further query else please accept the suggestion.
Thank you for contacting fixya.com

Jul 07, 2011 | Mazda MPV Cars & Trucks

1 Answer

I have a 1997 chevy lumina. i had 2 coded before, po420 and po401. i changed the egr valve, and now the po420 is gone. i just replaced the egr tube, cleared the codes, and now the po401 is back. car sounds...


Well, the po401 is saying is that the egr valve has restricted flow. After changing the egr and the tube, something else is causing the restriction. a more thorough diagnosis is recommended. The po420 code sounds like a possible catalyst failure or an o2 sensor failure.

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2004 Mercury Monterey 70k CEL code PO401


po401 egr flow insufficient vaulve could be stuck or disconected

Mar 02, 2010 | 2004 Mercury Montery

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My 2003 lancer has a trouble code po171 and po421 can you help


there is a recall on the po421 so check with your dealer it a cat. converter code, po 171 is a lean code check for vacuum leak or worn out plugs

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How do I fix the PO421 code? I own a 1996 Ford Probe that hasd failed the e-check because of the PO421 code. What do I need to do to solve this issue?



the trouble code means that the oxygen sensor is reading that your catalytic converter is no longer operating properly. Either the oxygen sensor(s) is faulty and is giving an incorrect reading or the catalytic converter is faulty. You should have a flow test performed on the cataytic converter to ensure it is performing properly. You can also check your oxygen sensor(s) before replacing them

Sep 30, 2009 | 2003 Mitsubishi Lancer

1 Answer

Code po421 how to fix


you have the same engine as my 2003 Galant, this should help... http://www.alldatadiy.com/alldata/AFI~V11366605~C40797~R0~OD~N/0/89012112/98644464/98644470/110938985/34853741/34857029/34857030/34857663/122915129/135964338/135975025

Mar 01, 2009 | 2003 Mitsubishi Eclipse Coupe

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