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I have a P0420 error code. But, whats confusing me is the
I have a P0420 error code. But, whats confusing me is the OBD reader is also telling me that the monitors for the O2 sensors are not reading. I replaced the Bank 1 downstream sensor, but still getting… read more
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P0430, Just had the car tuned up... what 02 sensor is
P0430 JA: Huh? Customer: Just had the car tuned up... JA: What is the model/year of your Nissan? Customer: what 02 sensor is calling this code.... JA: Have you scanned the code? Have you tried to rese… read more
EricFromCT
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I've got a p0420 upstream code after replacing whole exhaust
I've got a p0420 upstream code after replacing whole exhaust system as well as catalytic converters and 02 sensors, 1 of the sensors I replaced must be bad, can this be easily targeted and what kind o… read more
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My 2003 Frontier 6 cylende automatic truck has this code reading
My 2003 Frontier 6 cylende automatic truck has this code reading on it with the service engine light on catalyst system efficiency below threshold bank 2 p0430 How do I find out what this means and fi… read more
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I am working on a 2001 Nissan sentra 1.8. Looking at the o2sensors which are the bank 2 sensors? I am getting a PO430 and Po420 code… read more
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I bought a Nissan Sentra 2001 gxe . Troubleshooting p0430 As right after we drove it off the service engine light came on. Went to Auto Zone and they ran a diagnostic . The codes are AA1 large vacuum … read more
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2004 Nissan Xterra: liter-V6 engine-automatic..service engine soon
Recently purchased a 2004 Nissan Xterra-two wheel drive-3.3 liter-V6 engine-automatic. The vehicle had a "service engine soon" light on at the time that I purchased it; however I just crossed my finge… read more
Tim\u0027s Auto Repair
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A service engine soon light on that..catalytic converter..o2 sensor
I have a service engine soon light on that gives the code p0420 ( catalyst system efficiency below threshold, Bank 1). I have asked around and found that this is an issue with either the catalytic con… read more
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2000 NISSAN MAXIMA: SCANNER THAT says catylst INEFFICIENT IN bank
HELLO XXXXX 2000 NISSAN MAXIMA WITH 125,OOO MILES ON IT.I AM GETTING A CODE 430 ON THE SCANNER THAT SAYS CATYLST INEFFICIENT IN BANK 2.CAN YOU TELL ME WHAT IS THE CAUSE OF THIS IS IT THE SENSOR OR THE… read more
Paul M ASE Master
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engine light came on..diagnostic test..catalytic converter..same issue
i have a 2001 i30t and the engine light came on. Code p0430 appeared on a diagnostic test indicating a problem with catalytic converter bank 2. There were 2 errors detected and they both stated the sa… read more
HondaPlatinum
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2005 nissan maxima se: run fine..forums..its an O2 sensor..convertor
Hi I have a 2005 nissan maxima se with a code P0430. Car seems to run fine. Ive checked through the forums and Im getting conflicting information on wheter its an O2 sensor, precat or cat convertor. A… read more
HondaPlatinum
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2001 maxima: emissions test..catalytic..firestone..dealership
I have a 2001 Maxima 147k miles wiht no troubles at all and I'm getting a P0430 code and jsut failed the emissions test. I know it deals with the catalytic system. Firestone says take it to the dealer… read more
BigBob
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2001 Maxima SE: recently replaced..OEM..O2 sensors..Nissan instead
In my 2001 Maxima SE, I recently replaced my bank-1 and bank-2 catalytic converters with OEM parts from Bosal based on codes P0420 and P0430. Now I am getting those codes again and wonder how I can de… read more
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2006 nissan pathfinder: ses light..catalytic converter..the 02 sensors
2006 nissan pathfinder 115,800.00 miles ses light is on code po430 , failed bank 2 catalytic converter can i change the 02 sensors myself and which side is bank 2 also how many sensors are on each ban… read more
Ron Z.
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I have a 2004 nissan xterra and the service engine soon light
I have a 2004 nissan xterra and the service engine soon light is on. The codes are p0430 Catalyst system efficiency below threshold (bank 2) and p0328 Knock sensor 1 Circuit High Input (bank 1 or sing… read more
Steve
Steve
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2001 Nissan Frontier XE: 2.4L..a problem with check engine light
I have 2001 Nissan Frontier XE 2.4L, 2WD. Like many others, I have a problem with check engine light. It is a code O402 catalytic converter below thrashold (bank 1). Many other owners of Nissan Fronti… read more
Mike V.
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Subaru and Nissan factory training.
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2003 Nissan Xterra: Knock sensor..emissions..catalytic converter
What problems do the diagnostic codes P0420 (catalyst eff low bank 1), P0430 (catalyst eff low bank 2), and P0328 Knock sensor Bl signal high) mean and what repairs should be made? My vehicle is a 200… read more
Mike V.
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2001 Nissan Pathfinder LE: driver side..passenger side cam sensor
Hi. My 2001 Nissan Pathfinder LE has failed emissions testing with the codes P1145 (cam sensor bank 2-driver side) and P0420 and P0430 (catalytic converters) coming back. I had the passenger side cam … read more
OnlineHelp
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Bachelor's Degree
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I was in trouble with an electrical issue with my brand new Nissan. I frantically went online trying to find help and luckily I found your site. I reached a NISSAN tech named RIP. He was absolutely tremendous and helped me work through the issue. What a pro!

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used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

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Meet the Experts:

Chris(aka-Moose)

Chris(aka-Moose)

Nissan Technician

1,000 satisfied customers

24 years of experience diagnosing & repairing

Tim Mohr

Tim Mohr

ASE MASTER TECH

650 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

Marty

Marty

ASE Certified Technician

203 satisfied customers

ASE & Bosch master tech. 30 years experience.

Mike V.

Mike V.

Nissan Technician

9,976 satisfied customers

Nissan factory trained and Certified Subaru Technician.

Ron

Ron

ASE Certified Technician

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34 years of automotive Repair

Anthony

Anthony

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332 satisfied customers

ASE Master Automobile Technician with over 18 years exp. in this field.

Richard

Richard

ASE Certified Technician

92 satisfied customers

Nissan Tech ASE certified technician

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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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