Question about 2003 Mitsubishi Lancer

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Codes for engine 2003 mits lancer the code is P0421 warm up catalyst efficieny low bank one. what does this mean. and how do i fix it .thanks chad

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Solenoid is your problem, the solenoid is connected to the (EGR) exhaust gas resirculation, when the solenoid fail, the EGR don't work right, and your O2 sensor on the cat is reading to much exhaust gases in the cat, so your catalytic converter is failing, solution go to a junkyard and get one from other engine or similar the looks clean and replaced, run your car for more than 10 miles and your service soon engine light should go off, if that don't append your O2sensor on the cat is no good.

Posted on Nov 18, 2012

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YOU COULD HAVE AIR LEAKS AT THE EXHAUST MANIFOLD OR IN THE EXHAUST PIPES.OR YOUR CATALYTIC CONVERTER IS DAMAGED CONTAMINATED OR HAS FAILED.

Posted on Aug 02, 2010

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2002 mazda mpv sputtering


Error Code: P0421
Description:
Warm Up Catalytic Converter, Bank 1 - Efficiency Below Threshold
Possible Cause:
Warm Up Catalyst Bank 1 faulty.
Possible Solutions:
Check Warm Up Catalyst Bank 1 - Set Readiness.
Replace Warm Up Catalyst Bank 1.

Mar 04, 2014 | 1998 Toyota Corolla

1 Answer

2002 saturn engine codes p0305,p0421 & p1818,what needs to be done to correct problem?


P0305 - Cylinder number 5 misfire detected.
Probable faults and reasons:
Igniter no. 5 defective.
Ignition system malfunction.
Spark plug is short or its air too wide. (0.9 - 1.1 mm)
Weak compression.
Valve clearance less than recommended.
Engine valves and seats defective.
Fuel pump pressure too high.
P0421 - Warm up catalytic efficiency is below threshold (Bank 1)
Probable faults and reasons:
Catalytic converter.
Heated oxygen Bank 1.sensor 1, 2.
P1818 - Manufacturer specific code.

Dec 21, 2013 | Cars & Trucks

1 Answer

P0421


Hi there:DTC P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1)


Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.


You will likely not notice any drivability problems, although there may be symptoms. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.



A code P0421 may mean that one or more of the following has happened:



The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
A sparkplug is fouled up


Possible Solutions: Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.


One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 22, 2012 | 2003 Mitsubishi Lancer

4 Answers

2003 mitsubishi lancer will not pass smog code P0421 comes up what is this.


code P0421 may mean that one or more of the following has happened:
  • The catalytic converter is no longer functioning properly
  • An oxygen sensor is not reading (functioning) properly
  • A sparkplug is fouled up
Possible Solutions

Feb 27, 2011 | 2003 Mitsubishi Lancer

2 Answers

Hi, I need to take my 2001 Mazda 626 4cyln for SMOG check in CA. But its check engine light is on, diagnosed as code P0421. Appreciate your help to fix this problem, or just to pass the check. Thank you.


CODE P0421. DEFINITION-CATALYST EFFICIENCY LOW-BANK 1. EXPLANATION-THE OXYGEN SENSORS MONITOR THE CATALYTIC CONVERTERS ABILITY TO STORE OXYGEN. PROBLEM CAUSES- 1. CATALYTIC CONVERTER DEFECTIVE (FAILURE POSSIBLY DUE TO #2,3, OR 4) 2. ENGINE MISFIRE OR RUNNING CONDITION. 3. LARGE VACCUM LEAK 4. ENGINE OIL LEAKAGE INTO EXHAUST-VALVE GUIDE SEALS, PISTON RINGS. THE PCM HAS DETERMINED THAT THE WARM UP CATALYST EFFICIENCY FOR BANK 1 IS BELOW TRESHOLD FOR THE CURRENT ENGINE OPERATING CONDITION. (BANK 1 IDENTIFIES THE LOCATION OF CYLINDER #1, WHILE BANK 2 IDENTIFIES THE CYLINDERS ON THE OPPOSITE BANK).

replace O2 sensors, or your Catalytic Converter.

Oct 06, 2010 | Mazda 626 Cars & Trucks

1 Answer

MITSUBISHI LANCER 2003 CODE; P0421


The code means Warm-up catalyst efficiency below threshold.....

Feb 05, 2010 | 2001 Mitsubishi Galant

1 Answer

NEED TO KNOW WHAT IS THI P0421 ERROR CODE


PO421:Warm Up Catalyst-below threshold (bank #1) CEL

Nov 30, 2009 | 2003 Mitsubishi Lancer

2 Answers

P0421 ERROR CODE


P0421 is Warm Up Catalyst Efficiency Below Threshold (Bank 1)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Causes:
A code P0421 may mean that one or more of the following has happened:
  • The catalytic converter is no longer functioning properly
  • An oxygen sensor is not reading (functioning) properly
  • A sparkplug is fouled up
Possible Solutions:
Measure the voltage at the oxygen sensor on Bank 1 (the rear sensor, or the sensor after the converter). In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers
offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into

Nov 27, 2009 | 2003 Mitsubishi Lancer

2 Answers

Engine light on- PO421 Catalyst system bank 1


taken from: http://forums.evolutionm.net/lancer-troubleshooting/349095-code-p0421-call-mitsu-before-you-do-anything.html

Code P0421- Call Mitsu before you do anything! I called my nearest dealership today and for those who dont know, if your check engine light is on and its showing fault code P0421 this may be from a factory recall on the warm-up converter and a PCM reflash. MILEAGE OF THE CAR DOES NOT EFFECT THIS RECALL. Anyone whos had problem with a dealership not doing the repairs because of mileage needs to contact another dealer or the owner of the dealership. This is what the service manager told me today so though I'd share. Getting mine fixed tomorrow at 10am, I cant wait.

For more information about this code Google "Fault Code P0421" You'll get tons of information Last edited by Swankzer; Jun 2, 2008 at 12:31 PM.

Sep 30, 2009 | 2002 Mitsubishi Lancer

1 Answer

Service engine soon light is on


That is a heated o2 sensor problem o2 sensor should be replaced about every 80,000-100,00 miles.

Aug 14, 2009 | 2003 Mitsubishi Lancer

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