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I have a 2002 Nissan Xterra SE with a 3.3 V6 ENGINE. My Xterra has 2 catalytic converters, 1 on each side. However, it has a second piece that also looks like a catalytic converter on each side, if the the part connected to the exhaust manifold is the catalytic converter what is the other piece called that is connected to the catalytic converter?

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  • JORGE BUILLA Mar 18, 2014

    I am replacing the catalytic converters and the 4 O2 sensors, should I also replace the other 2 pieces? What are they called, what do I ask for? The whatchamacallit?

  • JORGE BUILLA Mar 20, 2014

    OK, MAYBE I'M NOT GETTING THE SITUATION ACROSS PROPERLY. MY TRUCK HAS 2 CONVERTERS, ONE ON EACH SIDE, THE CONVERTERS ARE CONNECTED TO THE EXHAUST MANIFOLDS. NOW CONNECTED TO THE OTHER END OF THE CONVERTER IS ANOTHER UNIT THAT ALSO LOOKS LIKE A CONVERTER WHICH IS CONNECTED IN SUCCESSION BEFORE THE FLEX PIPE, IT'S THAT SECOND UNIT WHICH I AM TRYING TO IDENTIFY. IS IT A SECOND CONVERTER? CAN I ELIMINATE IT?

  • Ken Walker
    Ken Walker Mar 20, 2014

    Yes Jorge the second is another converter that can be deleted.

  • David Burbee
    David Burbee Mar 20, 2014

    Yes, there are four converters with O2 sensors in all four...i am of the opinion to not remove two of them...you can replace them with high performance cats but to remove them negates two O2 sensor inputs to the PCM...

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When replacing your converters you can eleminate the second converter, shops in different states have different rules that may prevent them from losing the 2nd converter but you as an end user can but an aftermarket converter that will fit your car and install it yourself. This will require a sawzall or a good hacksaw to remove the old units so as to leave enough pipe coming down from the exhaust manifolds for the new converter to clamp on. Once the new converters are installed any muffler shop can hook up the rest of your system.

Posted on Mar 18, 2014

Testimonial: "THANKS KEN, I DIN'T KNOW THAT SECOND PIECE WAS ALSO A CONVERTER. I WAS THINKING SOME TYPE OF RESONATOR AND I NEEDED TO KNOW FOR SURE. THANKS AGAIN FOR YOUR HELP!"

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Good morning! your vehicle uses a flex pipe (see image)...That is the other part...One per side...They are prone to breaking but required...
I have a 2002 Nissan Xterra SE with a 3.3 V6 ENGIN - 88897226-8940-4431-95f9-85cdcb504ca8.jpgcost is approx. $95.00
Guru saailer

Posted on Mar 18, 2014

  • David Burbee
    David Burbee Mar 20, 2014

    There are four cats...See images...All four have O2 sensors...My opinion is to NOT remove any of them...They can be replaced with high performance cats...I see no good reason to remove them...Guru...saailer







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Posted on Jan 02, 2017

  • 90 Answers

SOURCE: Check engine,2000 Nissan Maxima

HI
yes there is two catalytic converters ???
one for any exhaust pipe bank (left & right) (bank 1 & bank 2 )
if you change the bank 1 ?? may be you need to change the bank 2 today?????
but not to change the same bank two time ???????

ask for more information
WITH MY BEST WISHES

Posted on Jul 14, 2008

Molson02536
  • 3854 Answers

SOURCE: How about when u have 2 catalytic converters in the same bank 1.?

If you have more than 60K miles start by replacing the Oxygen sensor(s) that is(are) installed after the catalytic converter(s). 
P0421: Warm up catalyst efficiency below threshold. This code means that the computer is detecting the catalyst not warming up to full function quickly enough based on information from the post cat O2 sensor. 

Good luck and hope this helps. 

Posted on Aug 21, 2009

  • 14036 Answers

SOURCE: 2 codes 1) P0420 catalytic converter

possible causes for code po420 airleaks at the exhaust manifold or in the exhaust pipes,base engine problems high engine oil or coolant usage,catalytic converter is damaged contaminated or has failed,continuos engine misfire conditions or weak or low coil out put,front HO2s or rear HO2s is contaminated with fuel or moisture,rear HO2s is loose in the mounting hole,front HO2s older aged than the rear HO2s or HO2s 1 - 2 is lazy.

Posted on Mar 31, 2011

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1 Answer

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The check engine light would come on and the computer would have trouble codes for the O2 sensors affecting one of the cats, also the exhaust could be restricted for one cat.

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The bank refers to which side of the engine. a four cylinder only has one bank so there can only be a bank 1. A v-6 or v-8 will have two banks since there is a bank of cylinders on each side of the engine. So there will be a bank 1 which is always the same side of the engine as the number one cylinder, and a bank 2 which is always the other side of the engine.

Sensor refers to upstream or downstream of the catalytic converter. Sensor one is upstream or before the cat. Sensor 2 is downstream or after the cat.

If you entered the wrong year or wrong vehicle or if you can post the actual code I will see if I can help you further.

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Sensor refers to before the cat or after the cat. Sensor 1 is before the cat and sensor two is after the cat.


So Bank 2 Sensor 2 is on the engine opposite of the number 1 cylinder and after the catalytic converter.

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1 Answer

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Apr 30, 2010 | 2001 Pontiac Grand Am SE

1 Answer

Exhaust issue


Most likely the heat shield has corroded off and is just sitting on top of the muffler or Catalytic converter. Regardless you can remove the shield and still run the the Xterra without any problems, the OEM muffler came with a heat shield as to the after market mufflers don't have one. The Catalytic converter also has a shield and you can remove it also as the Xterra has a heat shield on the floor board it self. Most exhaust shop if honest will tell you to just remove the rattling shield if there is no exhaust leaks or no Check engine light on that monitor's the Catalytic converter's performance.
A muffler shop if shady may advise you to replace the Catalytic converter and that can go for up to and beyond $400.00, so as long as there is no leaks or check engine light on. Go right ahead and remove the rattling shield.
Thank you for using Fixya

Mar 25, 2010 | 2002 Nissan Xterra

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bank 1 refers to the side of the engine that #1 cylinder is on , and sensor 2 refers to downstream , after the catalytic converter. , this link shows bank 1 on a 2001 nissan maxima V6 being on the firewall side . if you had a 4 cylinder it would be downstream after the catalytic converter .

http://www.autozone.com/N,26200242/shopping/specsSelect.htm



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