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Related Nissan Questions
Have a code P0430 bwing thrown Catalyst System efficiency
Have a code P0430 bwing thrown Catalyst System efficiency below threshold (bank 2). What does that mean.… read more
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I have an 06 Nissan Murano SL AWD and check engine came on
I have an 06 Nissan Murano SL AWD and check engine came on and I dot a few codes and read as follow; P1701 Trans backup error history and a P0420 catalyst system efficiency below threshold bank 1. For… read more
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nissan pathfinder: I had an emission test done to renew
hi I had an emission test done to renew my car tabs but it failed due to catalyst system efficiency below threshold bank 1. what does that mean and how do I get this fixed to get my emisssions test pa… read more
Ron Z.
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Pathfinder: i have a 2004 pathfinder. i got 4 error codes for
i have a 2004 pathfinder. i got 4 error codes for camshaft position actuator A - bank 1 & 2 timing over advanced (p0011/p0021), as well as Catalyst efficiency below threshold bank 1 & 2 (p0420/p0430).… read more
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failed emissions, emissions failure notice indicates: P0420
failed emissions, emissions failure notice indicates: P0420 catalyst system efficiency below threshold (Bank 1) (5) P0430 catalyst system efficiency below threshold (Bank 2) I need to know what needs … read more
Clifton B.
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2001 Frontier: emmissions due to poor catalyst efficiency
My 2001 Frontier is failing emmissions due to poor catalyst efficiency. Is it the lead cat that fails first or the second?… read more
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My service engine soon light is on..fuel system..catalytic converter
My service engine soon light is on. Auto Zone checked it & it came back with error code P0420. Definition catalyst system efficiency below threshold - bank 1. Probable cause large vacuum leak, fuel sy… read more
JOHN aka Eauto
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The service engine soon indicator reset..P0420..catalyst system
I just had the service engine soon indicator reset. The system message is P0420 - catalyst system efficiency below threshold (Bank 1). Is this something I should be concerned about?… read more
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2005 Altima: it only cranks, it..gas pedal..car runs fine
On my 2005 Altima I turn my ignition on but it only cranks, it does not start, until I hit the gas pedal. My vehicle hasn't had any other problems and after I am able to start it, the car runs fine. W… read more
Ryan
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45-50 mph or im doing over 2500 rpms the codes..control valve..leak
running several code but the main thing im noticing is that i cant go over 45-50 mph or im doing over 2500 rpms the codes are 430= catalyst system left bank 430= right bankp1448= evap canister vent co… read more
I. Silva
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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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2004 Nissan xterra: service engine soon..P0430 catalyst efficiency
2004 Nissan xterra and service engine soon ligth came on. The code is P0430 catalyst efficiency below threshold. I am inquiring more details and how much would this cost to fix?… read more
Mike O.
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2003 Pathfinder LE: 000 miles..p0420..o2 sensors..catalytic converters
My 2003 Pathfinder LE with 145,000 miles failed the DC emisions test on both banks: P0420 Catalyst System Efficiency Below Threshhold (Bank 1) P0430 Catalyst System Efficiency Below Threshhold (Bank 2… read more
Jay
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p0420 Generic Catalyst system efficiency below threshold bank
p0420 Generic Catalyst system efficiency below threshold bank 1, I'm getting this code on my 2005 Nissan Xterra. I'm guessing it is an O sensor, but which one to I get from the Dealer?… read more
Ron Z.
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2001 Nissan FRONTIER: 4cyl, 5 speed..CODE P0420..CATALYST SYSTEM
2001 Nissan FRONTIER, 4cyl, 5 speed, 260k miles....all commute. problem- CODE P0420 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 1. my question: how do i know which sensor to replace? My guess it… read more
Roy
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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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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.
nissan master auto tech
Associate Degree
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coils with a voltmeter..Keeps fouling out plugs and idles roughly.
how do I check the coils with a voltmeter? there are 3 wires and none are marked as normal +/-. Keeps fouling out plugs and idles roughly. Checked codes, turned up misfire and catalyst problems in "ba… read more
Jay
Jay
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Vocational, Technical or Trade Scho
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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.

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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.

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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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