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I have nissan pathfinder 2004 and the check light engine on and i have the codes p1148and p0430

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  • 123 Answers

Closed loop control bank1
Catalyst efficiency below threshold bank 2
Lookup your own fault codes with this free app

Posted on Nov 17, 2013

4 Suggested Answers

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Posted on Jan 02, 2017

bschilz
  • 2049 Answers

SOURCE: check engine light-on OBD code's P0420 &

The codes are Catalyst System Efficiency Below Threshold (Bank 1)&(Bank 2).

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

A code P0420 may mean that one or more of the following has happened:

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem.

Posted on Oct 06, 2009

ZX2Fast
  • 547 Answers

SOURCE: the engine light came on my 2005 pathfinder, I had

This would indicate that your cat is going bad. A bad sensor gives erratic readings and would set a different code.

Posted on Mar 05, 2010

  • 1 Answer

SOURCE: 1998 Nissan Pathfinder - Code P1444

Clean your mass air flow sensor with electrical contact cleaner. It's located between your air box and intake when it gets dirty it tricks your car into thinking it's getting less air than it is

Posted on Mar 20, 2011

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Nissan pathfinder p0430


A code like yours may mean that one or more of the following has happened: The catalytic converter is no longer functioning properly An oxygen sensor is not reading (functioning) properly There is an exhaust leak Possible So

Jul 20, 2014 | 2003 Nissan Pathfinder

1 Answer

I have Nissan pathfinder 2004 model and the light service is on......The codes i have are p1148,p0430


Hello,

In the code reader book are codes and possible problems, O2, EGR, etc.
Autozone, Orielly's should be able to help, they can code the vehicle also and help you find and fix the problem. Call and ask.

I hope this helps.

Oct 21, 2013 | Cars & Trucks

1 Answer

2006 Nissan Pathfinder SE--Have a P0430 Code and my gas mileage is not has good as it use to be. What could be the issue?


your downstream oxygen sensor (bank 2) is going bad. normally doesnt effect running but can cause rough idle because your car is tryn to adjust the amount of oxygen allowing into engine to compensate for the bad reading off the sensor. if you google search "nissan code p0430" you will find all the info. they arent cheap and you can do yourself but depending on age and condition of exhaust can be very hard to remove. you may want to spend the extra money to have a shop do it. thier only trick is to heat up the pipe around the sensor so you can try if you have the tools and ability to do it yourself.

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Check engine light on 40,000 miles nissan pathfinder 2006


You must scan the Engine Control Module and collect fault codes before it can be determined why your engine controller turned the light on.

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take to national parts store chain they will usually run trouble codes for free

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