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P0455,po421 - Mitsubishi Cars & Trucks

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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)

Posted on Apr 28, 2013

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Posted on Jan 02, 2017

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Code p0455 on envoy 2004


large evap leak --check gas cap that it is on --look under truck at rear of fuel tank by spare tire and check the evap canister and hoses the following link will assist you
https://www.obd-codes.com/p0455 How to Fix Check Engine Light P0455 Emissions Purge Valve Replacement How to Fix Check Engine Light P0455 Emissions Purge Valve Replacement

Sep 19, 2016 | Cars & Trucks

1 Answer

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

Apr 10, 2013 | 2003 Mitsubishi Lancer

1 Answer

PO421


PO421-Converter Efficiency Below Threshold (Bank 1 )

Your exhaust converter has failed in 8 or 9 years,instead of
the expected 12 to 15
You have to find out why,before replacing it

Mar 03, 2011 | 2002 Saturn VUE

1 Answer

Po421 and po456 mitsubishi lancer 2002.


po421 warm up catalist efficiency below threshold. could be o2 sensor after converter, could be a bad converter, or bad plugs.

po456 evaporative emission system ( evap ) very small leak detected

Jan 09, 2011 | Mitsubishi Lancer Cars & Trucks

1 Answer

Getting codes PO431, PO421, PO128


2003 saturn vue, we dont have the engine size, the codes should be and are the same, po 128 means; cooling temp is out of spec, make sure the coolant is full, then replace the coolant emp sensor and make sure the connection is good, i would also replace the thermostant, this is a common code on these and most of the time its the coolant temp sensor or thermostant, ive learned to replace then both to avoid future engine lights with code po128. next we will check the code # po421, this code is that the computer sees that the cat converters are taking to long to warm up, code po 431 is also the same as po421, this code is related to the thermostant and sensor, the sensor give the computer the wrong temp readings and then the compuetr thinks the engine is hotter than it is and thinks the converters should be also hot like the motor but the coolant temp is giving a false reading, if you replace the coolant temp sensor and the thermostant and fill coolant , then reset the light and you will solve the problem, i hope this is helpful, also the sensor is located to the right of the engine if you are standing in front of the motor, heres a picture of the sensor, remember to check connector heres a pic of the connector, good luck.johnjohn2_20.jpg

Nov 10, 2010 | 2003 Saturn VUE

1 Answer

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

Oct 24, 2009 | 2003 Mitsubishi Lancer

4 Answers

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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