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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
Tim Mohr
Tim Mohr
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Master's Degree
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I have an 05 Nissan Frontier had a check on my truck and got
I have an 05 Nissan Frontier had a check on my truck and got a PO430 code reading. What is that? … read more
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I have a Nissan titan 2005, I have replace all bank sensor,
I have a Nissan titan 2005, I have replace all bank sensor, the problem is that bank 2 sensor is cycling faster than the rear bank 2 sensor. can u help me with that answer… read more
camerontech
camerontech
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Xterra: 2006 Nissan Xterra, I had codes saying the catalyst
2006 Nissan Xterra, I had codes saying the catalyst efficiency was below threshold for both banks, this tells me that the O2 sensors are all working or it wouldn't know that it was below threshold, co… read more
Jay
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nissan maxima: 2001 nissan maxima engine code p0430 catalyst
2001 nissan maxima engine code p0430 catalyst efficiency below threshold bank 2. ive changed i beleive all the o2 sensors on this car before in the past 5 years and the cat coming off the headers by t… read more
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Nissan Maxima: I have a 2000 Nissan Maxima and my check engine
I have a 2000 Nissan Maxima and my check engine light is on. I took it to a mechanic and he says it is the 02 sensor Bank 1 and Bank 2, does this mean I need to replace the converters?… read more
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Nissan/Datsun Sentra GXE: Have 2002 sentra 1.8 gxe that
Have 2002 sentra 1.8 gxe that stalls at different times , and has engine light code po430 (cat system efficiency threshold bank 2) .... Have replaced cat. converter, front oxy. sensor ,checked for loo… read more
Jay
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im getting trouble codes ofp0420 Catalyst System Efficiency
I'm getting trouble codes of P0420 Catalyst System Efficiency Below Threshold (Bank 1) P0430 Catalyst System Efficiency Below Threshold (Bank 1) what does this mean?… read more
Richard
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We tried new plugs two new o2 sensors left bank..timing..plug wires
We tried new plugs two new O2 sensors left bank before and after cad., adjusted timing. tried different plug wires. tried another computer.tried another coolant sensor. I'm getting a engine light now.… read more
Rick
Rick
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98 Nissan Pathfinder: Im getting two codes..Knock Sensor..O2 sensor
My '98 Nissan Pathfinder just failed the state inspection in Texas. I'm getting two codes: PO430: Catalyst System Efficiency Below Threshold (Bank 2) and PO325: Knock Sensor 1 Circuit Malfunction (Ban… read more
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Nissan maxima: po430 code now after test drive i have a po161 code
00 nissan maxima changed front cat for po430 code now after test drive i have a po161 code any ideas… read more
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2004 nissan xterra with the check engine light on the codes
2004 nissan xterra with the check engine light on the codes are PO420 catalyst eff bank 1 PO430 catalyst eff bank 2 and PO328 knok sensor high input. Any ideas on what the problem may be?… read more
Mike V.
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Subaru and Nissan factory training.
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2000 Sentra: a rough idle .Code says vacuum leak but I cant find
Hi, I have a 2000 Sentra 1.8 with a rough idle .Code says vacuum leak but I can't find. Any suggestions? Thanks… read more
Eric
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2001 Nissan Sentra GXE: it threw the following codes..Po..Catalyst
I have a 2001 Nissan Sentra GXE 1.8. It is not running correctly and on a code machine it threw the following codes: Po 420 Bank 1 Catalyst eff. below threshold Po 430 Bank 2 catalyst eff. below thres… read more
Ironmike
Ironmike
ASE Master ,Ford Certified Master Tech
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2001 Nissan Sentra: inspection..Service Engine Soon..Diagnostic..P0420
I recently took my 2001 Nissan Sentra for inspection and, although I have always tried to maintain my car, it passed in all areas except for the "Service Engine Soon" light. The Diagnostic Trouble Cod… read more
earl
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High School or GED
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2001 sentra: car runs great, idles smooth, no misfire..o2 sensors
I have a 2001 Sentra XE. I pulled two codes from the OBD II scanner: P0420 and P0430, catalyst efficiency below threshold, banks 1 & 2. The car runs great, idles smooth, no misfire...even under a load… read more
Clifton B.
Clifton B.
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Associate Degree
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2000 nissan maxima: code po430 bank 2. what part of the car
i bought a 2000 nissan maxima a week ago the code 4 the warm up three way cat came on code po430 bank 2. what part of the car should i be lookin for.and only have to cat does that mean it is not a cal… read more
Rixster
Rixster
Sr. Technician/Retired Owner
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2000 nissan maxima: full throttle..diagnostic test..catalyst
own a 2000 nissan maxima, not getting full throttle and engine light is on. after having diagnostic test done the following code appeared: PO430....three way catalyst function(bank2). what does this m… read more
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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)

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Marty

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Mike V.

Mike V.

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Ron

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Richard

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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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