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Related Nissan Questions
I have 2009 Infiniti FX35 code P0430 catalyst system
I have 2009 Infiniti FX35 code P0430 catalyst system efficiency below threshold bank 2. They replace the converter on the drivers side but the code is still being thrown, should bank 1 have been repla… read more
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Pathfinder: .. I have a 2001 Pathfinder LE 120K miles
Hello.. I have a 2001 Pathfinder LE 120K miles with OBD codes reading PO420(Bank 1) and PO430 (Bank 2) Catalyst System Efficiency Below Threshold..No power loss or idle stumble. What's your call here?… read more
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nissan maxima: 2001 nissan maxima engine code p0430 catalyst
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internal88
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Pathfinder: i have a 2004 pathfinder. i got 4 error codes for
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failed emissions, emissions failure notice indicates: P0420
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2001 nissan sentra: idles..park and neutral..steering pump..stall
i have a 2001 nissan sentra 1.8, it has a hard time starting with any condition, once started it idles like brand new at around 1000rpm in park and neutral, as soon as you put it in gear the rpm drops… read more
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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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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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2001 Nissan Sentra: 2 sensors and spark plugs..Check engine light
I have a 2001 Nissan Sentra, replaced catalytic converter, 2 sensors and spark plugs. Check engine light still comes on, (it is off and on, more on then off) Any suggestions?… read more
Eric
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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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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
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2001 nissan frontier: 2wd v6 3.3l..autozone..circuit
I have a 2001 nissan frontier 2wd v6 3.3l and i have an error p0130. the definition i got from autozone is " air fuel ratio sensor 1 bank 1 circuit. also code p0430 came up 2x " catalyst system effici… read more
Anthony
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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
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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
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2001 I30: maf..THIS and ecm PROBLEM..VEHICLE RUNS FINE..MILES PER
I HAVE A 2001 I30 WITH 63000 MILES THE OXYGEN SENSORS AND MAF HAVE BEEN REPLACED DUE TO ERROR CODES, THE LATEST CODE TO APPEAR IS CAT THRESHOLD EFF BANK 1 IS THIS AND ECM PROBLEM? THE VEHICLE RUNS FIN… read more
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N/A
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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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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
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Vocational, Technical or Trade Scho
25,859 satisfied customers
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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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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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24 years of experience diagnosing & repairing

Tim Mohr

Tim Mohr

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Marty

Marty

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Mike V.

Mike V.

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Ron

Ron

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Anthony

Anthony

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

Richard

Richard

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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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