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Service Engine Soon light came on, then went off on its own.
Service Engine Soon light came on, then went off on its own. But I need an inspection this month. Concerned it won't pass because the light was on for one day, a couple days ago. … read more
Mike V.
Mike V.
technician
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The guys at the parts store said my yellow check enginelight
The guys at the parts store said my yellow check enginelight wouldn't read any codes on my 2.4l 2002 galant … read more
JOHN aka Eauto
JOHN aka Eauto
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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
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Vocational, Technical or Trade Scho
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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
Roy Belding
Roy Belding
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I have a 2006 mitsubishi galant 3.8 v6 with a service engine
I have a 2006 mitsubishi galant 3.8 v6 with a service engine soon light on.. Friend had a portable diagnostics mechanism, and showed the code p0421… read more
Doug
Doug
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Mitsubishi Galant: 06 mitsubishi galant 2.4l obdii says all
06 mitsubishi galant 2.4l obdii says all four o2 sensors have failed. Is there a common connector or relay for the o2 sensors?… read more
Doug
Doug
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Vocational, Technical or Trade Scho
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Answers from Two Experts requested: Mitsubishi Galant ES: I have a 2003 Mitsubishi Galant
I have a 2003 Mitsubishi Galant and it has a recurring code of 421 and 507 I just replaced the Intake which had cracked (2.4L)… read more
Doug
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I have a 2006 Lancer and this code came up when trying to get
I have a 2006 Lancer and this code came up when trying to get my car inspected. (It was bought in Florida - no inspections there and now live in NY) The first repair shop I took it to told me I needed… read more
Doug
Doug
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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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Mitsubishi Eclipse GS: Im getting a Knock Sensor trouble code
I'm getting a Knock Sensor trouble code and a Warmup Catalyst below threshold error. Is the catalytic converter going bad and causing the air fuel mixture to be to rich or too lean and causing an engi… read more
Doug
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I recently received some excellent help regarding my 2001 Mitsubishi
I recently received some excellent help regarding my 2001 Mitsubishi Eclipse. I have a new problem now. The Service Engine Soon light came on, we read the code it was P0421....Catalyst system efficien… read more
Eric
Eric
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N/A
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service engine light on, codes- po154, po421 & po174 is a pending code, I pulled the c
service engine light on, codes- po154, po421 & po174 is a pending code, I pulled the code info but what exactly do these codes mean, (PO154) O2 sensor CKT no activity bank 2 sensor (PO421) warm up cat… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
8,677 satisfied customers
I have a 2007 Mitsubishi Endeavor with about 89,000 miles.
I have a 2007 Mitsubishi Endeavor with about 89,000 miles. A while back, the service engine soon light came on and sporadically went off and on. Basically, when I filled up with gas the light would co… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
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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
2006 mitsubishi lancer es: my check engine light came on
OK I have a 2006 mitsubishi lancer es 2.0L. About 6 months ago my check engine light came on. I took it in and they said the Cat was bad. I had it replaced. Everything was fine until the other day the… 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: 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
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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
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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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