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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
Kyle
Kyle
Under hood Technician
754 satisfied customers
I Have a 2004 Endeavor and I have a P0135 service code. It
i Have a 2004 Endeavor and I have a P0135 service code. It says a fault in the Bank 1 Sensor 1 O2 Heater electrical circuit. and a P0421 Warm up Catalyst efficiency below threshold bank 1. Now I figur… read more
sara cole
sara cole
associates
108 satisfied customers
I have a 2001 v6 eclipse spyder. Was running good did have a
I have a 2001 v6 eclipse spyder. Was running good did have a p0421 coming and going. The low fuel light came on and someone drove it without looking until the low fuel light went out. So when I got in… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
24,897 satisfied customers
My smog test failed. P0421- catalyst 1 efficiency below
my smog test failed. P0421- catalyst 1 efficiency below threshold bank 1. … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
22,566 satisfied customers
I have a 06 Mitsubishi Endeavor that has an error code
Customer: I have a 06 Mitsubishi Endeavor that has an error code P0421. The mechanic told me it is probably an O2 sensor failure. I want to find a compatible part for him to replace. It seems that the… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Dough, I have 2003 Mitsublishi Galant ES. I had code P0135
Hi Dough, I have 2003 Mitsublishi Galant ES . I had code P0135 which I replace a 02 sensor in bank 1 But now I getting a code P0421 and the code P0135 Clear up. What do I do now… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Eclipse GT: I received a P0421 error. I have changed
I received a P0421 error. I have changed all 4 sensors and reset the code, however, the service engine light continues to burn bright and when I check the code, it is the same one for the sensors that… read more
Eric
Eric
Retired
N/A
42,073 satisfied customers
Mitsubishi Eclipse GTS: Hello Doug, I have been trying without
Hello Doug, I have been trying without any luck to locate the intake manifold control valve and circuitry on my 2003 Mitsubishi eclipse gts 3.0 v6. Getting trouble codes P0660 and P0135. Thank you Bar… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Montero Sport: What is the problem when P0154 Bank
What is the problem when P0154 Bank 2 Sensor 1 (2003 Mitsubishi Montero Sport 3.0) comes up when testing Check Engine Light? The mechanic that I normally go to has spent months saying that he is askin… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
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
Retired
N/A
42,073 satisfied customers
Mitsubishi Endeavor: I am getting codes P0135 and P0141, I
I am getting codes P0135 and P0141, I have preplaced both O2 Sensors but continue to get the codes… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
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
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi Lancer Oz Rally: As I was getting on the freeway
As I was getting on the freeway my 2002 Mitsubishi Lancer Oz-rally automatic jerked as I accelerated. I'm not sure what the problem is.… read more
Greg
Greg
Shop owner, technician
Vocational, Technical or Trade Scho
6,975 satisfied customers
Mitsubishi Lancer Oz Rally: I recently got a diagnosis on my
I recently got a diagnosis on my 2003 Mitsubushi Lancer about a month ago and it said warm catalyst efficency banl 1 below thershold. i'm assuming it to be the converter in the engine since last year,… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
Mitsubishi endeavor: O2..p0135..schematic blow up for there locations
I have an 04 mitsubishi endeavour and its giving me O2 codes p0135-0141 bank 1 sensor 1 and 2. Where are the exact locations for these two sensors? If possible please show schematic blow up for there … read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
2003 Mitsubishi Lancer: trouble code..Warm..catalyst..below threshold
I have a 2003 Mitsubishi Lancer. It shows the following trouble code P0421 Warm up catalyst efficiency below threshold Bank 1. could someone explain what this means and a possible solution. Thanks for… read more
Doug
Doug
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 satisfied customers
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
ASE Certified Technician
Vocational, Technical or Trade Scho
7,006 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
7,006 satisfied customers
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Meet the Experts:

Doug

Doug

ASE Certified Technician

7,006 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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