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P0421 came on after changing all 4 o2 sensors, Yes and have
Prior ro changing all the o2 sensors i had codes for bank 2 cat. Eff. Now its moved to bank one… read more
sprinkles08
sprinkles08
Technician
High School or GED
19,830 satisfied customers
P0421 bank 1 is code on my mitsubishi. how to fix , car
Customer: P0421 bank 1 is code on my mitsubishi. how to fix … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
Mitsubishi Eclipse GT: I have a 2008 mitsubishi eclipse with
I have a 2008 mitsubishi eclipse with a 3.8l engine. the service engine light is on and it has 3 codes PO421 , P0431 , AND PO300. what problem is this indicating and what do I need to do to resolve th… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
Hi Doug Thank you for your advice last time. Well I have a
Hi Doug Thank you for your advice last time. Well I have a bunch this time, not sure if they are related: 1. The check engine light went off on my 2003 Mitsubishi Montero Limited. So I went ahead and … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
Mitsubishi Endeavor XLS: Hi Doug... I have a 2005 Endeavor
Hi Doug... I have a 2005 Endeavor which just the other day started putting out a P0431 code. I have read your response to this question and have a couple of follow-ups for you. Just for clarity's sake… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
NISSIAN ALTAMA: 2006 NISSIAN ALTAMA 2.4. CHANGED ALL 4 O2 SENSORS
2006 NISSIAN ALTAMA 2.4. CHANGED ALL 4 O2 SENSORS AFTER ABOUT 100 MILES SAME CODE POPPED UP PO431… read more
Amedee
Amedee
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Vocational, Technical or Trade Scho
22,431 satisfied customers
Mitsubishi galant ES: I have a 2005 Mitsubishi Galant ES with
I have a 2005 Mitsubishi Galant ES with 118,768 miles. I got a code P0421. I have replaced all 4 oxygen sensors.The code still returns then goes off for about 2 weeks and comes on again. Vin # XXXXX… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
2005 mitsubishi galant: v6..check engine light..oxygen sensor..reads
I have a 2005 mitsubishi galant v6 with a check engine light on. I replaced the oxygen sensor and now the code reads replace catalytic converters. The light has been on for over a year and I'm having … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
lancer oz rally: 2 days later engine light comes on and spits..recall
just purchased a 2005 mitsu lancer oz rally. of course 2 days later engine light comes on and spits out a p0421 code. internet research indicates a pcm reflash recall. My question is considering a cat… read more
Eric
Eric
Retired
N/A
42,136 satisfied customers
2005 Mitsubishi Galant: the OBD was reading a p0431 code
On a 2005 Mitsubishi Galant, what would the problem be if the OBD was reading a p0431 code?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
Check engine light came on when I was..Misfire..cylinder
Check engine light came on when I was out of town daughter continued to drive. Three codes came up Misfire in cylinder 3, P0421 and P0421PD. Changed the plugs erased the code and at 30 Miles took it b… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
Mitsubishi Galant GS The code PO421 Warm Up Catalyst Efficiency
The code PO421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)(5). What kind of repairs am I looking at?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
Mitsubishi Galant: catalyst below threshold bank 2..sensors
Mitsubishi Galant 2005...has codes of P0431 - warm up catalyst below threshold bank 2, and P0421 same but bank 1. I have very limited funds, and need to know what to have repaired first. I believe the… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
2004 mitsubishi galant: AFTER THE CHECK ENGINE LIGHT IS ON I..CYLINDER
HI, I'VE GOT A 2004 MITSUBISH GALANT 4A3AB36F54E127652. AFTER THE CHECK ENGINE LIGHT IS ON I READ A CODE P0421 AND PROCEED SOME TESTS, BUT I'M HAVING SOME TROUBLE TO IDENTIFY THE OXIGEN SENSOR ON CYLI… read more
HondaPlatinum
HondaPlatinum
Vocational, Technical or Trade School
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Mitsubishi Galant I Have 02 Mitsubishi Galant 3.0 V6 with
I Have 02 Mitsubishi Galant 3.0 V6 with the check engine light on, It Has Codes P0431 and P0432. Can someone please help figure out what's the problem?… read more
Amedee
Amedee
Automotive Consultant
Vocational, Technical or Trade Scho
22,431 satisfied customers
Lancer: I recently had my 2002 mits..inspected..p0135..o2 Sensor
I recently had my 2002 Mits Lancer inspected and failed due to codes P0135 and P0421. I brought the car to a Mits Dealer and was told those codes meant I needed $1399 in repairs: An O2 Sensor (B1 S1) … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
i have a p0421 code on my 02 mistsubishi lancer oz rally..
i have a p0421 code on my 02 mistsubishi lancer oz rally.. the code is the warm up catylist bank.. ive replaced the cat and still the code shows up after reset.. any ideas?… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
2005 Mitsubishi Galant: The Check Engine Light Keeps coming on, and we
We bought a 2005 Mitsubishi Galant for our daughter. The Check Engine Light Keeps coming on, and we have had it checked a couple of different times, and they tell me that the code is for the catalytic… read more
Gary
Gary
Vocational, Technical or Trade Scho
15,858 satisfied customers
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Doug

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