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Nissan fault codes po171 and po420

Fault came on dash airbag warning and engine fault someone gave me codes po171 and po420 is this a catalyst fault

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: what does engine fault code po171 system too lean bank 1 mean thanks

i think its the oxygen sensor (pre cat) in exhaust

Posted on Sep 23, 2008

ewashmidas
  • 362 Answers

SOURCE: I got code PO420 and PO430

Here are the most common problems,

Air leaks at the exhaust manifold or in the exhaust pipes. Catalytic converter is damaged, contaminated or has failed. Front HO2S or rear HO2S is contaminated with fuel or moisture. Front HO2S and/or the rear HO2S is loose in the mounting hole. Front HO2S older (aged) than the rear HO2S (HO2S is lazy)

Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. Autozone turning the light off does nothing for you, and is against their company policy. If you do not have the proper tool, reference materials or experience I would take it to a professional. Finding out the trouble code is just he start of the diagnosis process.

Hope this helps.

Dave

Posted on Feb 28, 2009

JJ_Barricade
  • 11 Answers

SOURCE: receiving engine code p0420 on my 2005 altima 2.5 s

A p0420 code indicates a Catalytic System efficiency failure, Bank 1.
Basically, the computer is seeing reduced efficiency of the catalytic converter or one of it's components (such as an 02 sensor)

There may be a few root causes, such as a faulty oxygen sensor, faulty coolant temperature sensor, faulty converter, Large exhaust leak, or retarded (slow) timing.

Posted on Nov 30, 2009

  • 56 Answers

SOURCE: check engine light on PO420 code ? recalls

Huge problems with these cars. The Pre-cat converter is built into the exhaust manifold. Expensive to replace. No Recall on this item. Some say that inferior compounds in the catalyst cause corrosion and early wear of the piston rings. I have seen one of these use 5 qts of oil in 300 miles. Is this car using excess oil?

Posted on Jan 16, 2010

4743micheal
  • 54 Answers

SOURCE: Nissan Primera petrol P12 - malfunction warning

tats the engine management light mate usally comes on when u have low oil or antthing to do with the engine bring it to nissan dealer if its not low oil they will hook it up to a machine and bingo they have your problem.

Posted on Feb 24, 2010

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Air bag code


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Codes po303, po171, po137. po420


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Dec 02, 2015 | 2005 Toyota Corolla

1 Answer

What does code 12 airbag fault mean


please don't play with the air bag , if it deploys it will cost many dollars worth of damage, take it back to the dealer to repair any faults.

Jul 28, 2014 | 2007 Nissan Qashqai 1.6

1 Answer

Servise engine soon code po325 or po420


P 0325 - Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
P 0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Dec 26, 2010 | 1998 Nissan Pathfinder

1 Answer

Im trying to get my mother in laws 2006 chevy equinox to pass emissions the codes po171 and po420 keep coming up po171 is lean bank one and po420 is catalyst below efficency im trying to narrow it down to...


For the lean condition I wound look for vacuum leaks.I you don`t find any then replace the o2 sensor for bank 1.As for the po420 if the exhaust system is not bent or damaged you will have to replace the catalytic converter.The catalytic converter has a longer warranty then the regular vehicle warranty itself so call the dealership and find out if the converter is still under warranty.The usual warranty I believe is around 80k.mileage years is 7 or 8 not positive.Hope this helps.Good luck.

Sep 15, 2010 | Chevrolet Equinox Cars & Trucks

2 Answers

Check engine light on PO420 code ? recalls


Huge problems with these cars. The Pre-cat converter is built into the exhaust manifold. Expensive to replace. No Recall on this item. Some say that inferior compounds in the catalyst cause corrosion and early wear of the piston rings. I have seen one of these use 5 qts of oil in 300 miles. Is this car using excess oil?

Jan 16, 2010 | 2005 Nissan Altima

1 Answer

My car got a po420 code reading when i went to get it inspected. whats that mean


The PO420 means that the Catalyst System has an Issue'

The actual error is

"Catalyst system below Threshold (bank 1)"

As mentioned above, the code's description is Catalyst System Efficiency Below Threshold (Bank 1). OK, now tell me that again in plain English please.... let's break it down: the catalyst system being referred to is your three-way catalytic converter; so the catalytic converter is not working properly (i.e. it's not efficient). Bank 1 refers to the side of the engine which contains cylinder #1. On inline engines such as 4 & 5 cylinder engines, there is only one bank. So, to really simply things let's just say that the efficiency of the catalytic converter and/or exhaust pipe and/or O2 sensor is not so great.

There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.

You can search for the Information on the web. Just type in the actual error above into you fav search engine!

Hope that helps...

Dec 28, 2009 | 2004 Nissan Altima

1 Answer

PO420 Catalyst System Efficiency below threshold.


Basically the mechanic will make sure don't need a tune up. or have vacuum issues or leakes in the exhaust before the cat. Then he should check the front 02 sensor to make sure its not getting lazy. If all this passes then you will need a new cat. If the O2 sensor has more than 70,000 miles on it it needs to be replaced anyways so you may just want to do this first and hope the light stays off.. The problem with a lean code is you will wear out the cat real fast if you didnt deal with this and kept driving the car. The lean code could have been vacuum leak or a bad MAF sensor or weak fuel pump.

Sep 02, 2009 | 1999 Mercury Mystique

1 Answer

Troubleshooting PO420 OEM Brand


I work at an auto parts store, and i can tell u that it will be the oxygen sensors that is the problem.

Aug 19, 2009 | 2002 Toyota Camry

1 Answer

PO420" Catalyst efficiency low Bank 1"


Replace the catalytic converter.

Mar 09, 2009 | 1999 Acura TL

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