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Code p0421 keeps showing up changed o2 sensors cleared code
Code p0421 keeps showing up changed o2 sensors cleared code but still shows up … read more
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I have 4 02sensors and not sure which location is which.
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Mike V.
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P0421 reads: Warm up catalyst below threshold Bank 1. If
P0421 reads: Warm up catalyst below threshold Bank 1. If bank 1 O2 sensor is pre-cat, maybe that O2 sensor could be bad but not the catalyst. If it were Bank 2, the O2 sensor after the catalyst, there… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
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Have a Mits Galant ES 2.4L (2003) throwing codes P0304 and
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05 galant es speedometer works erratic lyrics sometimes. The
05 galant es speedometer works erratic lyrics sometimes … read more
Greg
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I have a lancer 2003, i have a p0421 p0135 i change bank 1
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Peter Bagley
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I have a Mitsubishi Galant GTS 2005 that is presenting this
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Matt
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I have a 2006 Mitsubishi ES and I got a P0031 code (HO2S
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Gary
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P0421 bank 1 is code on my mitsubishi. how to fix , car
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Doug
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I have 2 codes on my car on. P0300 and P0421.. 1999
Hi I have 2 codes on my car on. P0300 and P0421.. 1999 Mitsubishi Galant with a 2003 rebuilt motor. Car sometimes don't want to start not sure why or what I should fix first… read more
Expert
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Mitsubishi Galant ES: I have Mitsubishi Galant 2004, ES, 2.4L
I have Mitsubishi Galant 2004, ES, 2.4L engine. The service engine soon light has turned on for quite some time now. The OBD code is P0135. Please advice the procedure to change the oxygen sensor alon… read more
Doug
Doug
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Vocational, Technical or Trade Scho
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Mitsubishi Galant ES: Iam getting p0421 on my 1999 galant
I'am getting p0421 on my 1999 galant which have 108000 miles. Check status of monitors and all say ready. The o2 sensors have never been changed as far I know. The car is running fine and there are no… read more
Eric
Eric
Retired
N/A
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We are getting 02 codes P0135 and P0161. We have replaced
We are getting 02 codes P0135 and P0161. We have replaced the 02 sensor for the P0135 but where is P0161? The service engine light continues to come on. Our diagnostic device continues to show the P01… read more
Doug
Doug
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Vocational, Technical or Trade Scho
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Mitsubishi Galant ES: My daughter has a 2003 Galant ES with
My daughter has a 2003 Galant ES with the 2.4 I4 engine with 190k. The fuel mileage has dropped to about 16 mpg, used to get 26. It has the 421 and 102 codes. I am fairly sure the 102 code is due the … read more
Doug
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Mitsubishi Eclipse: I have a 2001 Eclipse Spyder Gt. I replaced
I have a 2001 Eclipse Spyder Gt. I replaced the O2 sensor on bank 1 because of a P0135 code. That code has cleared and I now have a P0431 code. I notice that I have a loose wire coming from the wire b… read more
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Mitsubishi Eclipse GT: My Nephew had a private mechanic diagnose
My Nephew had a private mechanic diagnose his "check engine light" and he found “check engine code P0421” which he took to the Dealer who ordered and installed a catalytic converter. After driving the… read more
Doug
Doug
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2003 Mits Lancer ES, code PO 0421 (warm up catalyst efficiency
2003 Mits Lancer ES, code PO 0421 (warm up catalyst efficiency below threshold bank 1) Records show the cat (which one?) replaced at 78,000, currently 131,000. Fuel sensor (think #1) replaced two year… read more
Eric
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Retired
N/A
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Mitsubishi eclipse GTS 2003 mitsubishi exclipse GTS; 3.0 L
2003 mitsubishi exclipse GTS; 3.0 L V6, Front upstream O2 sensor replacement according to manual. Code of P0135 indicates (Upstreatm heated O2 sensor heater cicuit fault - Bank 1). Is this the one whi… read more
Doug
Doug
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Vocational, Technical or Trade Scho
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Meet the Experts:

Doug

Doug

ASE Certified Technician

8,677 satisfied customers

Mitsubishi employed and Factory trained ASE certified technician

Chris (aka- Moose)

Chris (aka- Moose)

Technician

373 satisfied customers

24 years of experience diagnosing & repairing

George H.

George H.

ASE Certified Technician

321 satisfied customers

ASE Master tech 15+ years

Tim Mohr

Tim Mohr

ase master

230 satisfied customers

30 yrs foriegn and domestic, gas and diesel

Don - Mo Lurch

Don - Mo Lurch

Mitsubishi Mechanic

60 satisfied customers

16 years, Line Mechanic, Electronics trouble shooting, etc

AMD

AMD

Master Technician

48 satisfied customers

L1 Advanced Level Diagnostics Specialist

BigBob

BigBob

Service manager/Technician

46 satisfied customers

25 years in the auto repair business

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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