Replaces

2002-03 Nissan Altima Sentra Catalytic Converter - 1AEEK00318

Description
Warranty & Shipping
How-To & Tools
Product Reviews
Q&A
Vehicle Fit

Part Details

  • Includes:
      Downstream Oxygen Sensor
      Upstream Oxygen Sensor
  • Quantity:   4 Piece Set

Over time, rust and heat cycles can make removing an oxygen sensor almost impossible. Stripped threads and broken wires can result in more down time and additional trips to the parts store. Skip the headaches and get your Exhaust Manifold, Catalytic Converter, Upstream Oxygen Sensor, and Downstream Oxygen Sensor in one complete kit.

Specifications:

  • Exhaust Manifold with integrated Catalytic Converter
    • New 1 piece design with new catalytic converter (not reconditioned)
    • Direct replacement
    • Corrosion resistant
    • Replaces original manifolds that are cracked from thermal expansion and contraction
    • Strengthened and redesigned in the vulnerable areas of failure
  • Upstream Oxygen Sensor
    • Direct Fit
      • Correct wire length, no cutting or splicing
    • Built and tested to strict quality control standards
  • Downstream Oxygen Sensor
    • Direct Fit
    • Built and tested to strict quality control standards

Due to state emissions regulations, we cannot ship this item to the state of California as it is not C.A.R.B ( California Air Research Board) approved for use in the state of California.

Item Condition: New

Attention California Customers:

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

5 Year Warranty

This item is backed by a 5 Year Warranty. In the event this item should fail during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. 

  1. step : Disconnecting the Battery (0:59)
    • Disconnect the negative battery cable with a 10mm socket and ratchet
  2. step : Removing the Oxygen Sensors (1:10)
    • Disconnect the downstream O2 sensor wiring harness
    • Remove the downstream O2 sensor with an O2 sensor socket
    • If the O2 sensor socket does not work, cut the wires off the O2 sensor
    • Then remove the O2 sensor with a 7/8 inch socket
    • Disconnect the upstream O2 sensor wiring harness
    • Remove the upstream O2 sensor with an O2 sensor socket
  3. step : Removing the Alternator (3:15)
    • Apply penetrating oil to the four bolts on the catalytic converter heat shield
    • Let the penetrating oil sit
    • Remove the 4 5mm Allen bolts from the engine cover
    • Remove the engine cover
    • Remove the two 10mm bolts from the alternator
    • Disconnect the alternator wiring harness
    • Remove the 12mm bolt from the alternator
    • Attach a 14mm wrench to the serpentine belt tensioner
    • Use the wrench to loosen the belt
    • Pull the serpentine belt off the alternator
    • Release the tensioner
    • Remove the upper of the two 14mm bolts from the alternator
    • Pull off the fuse box cover
    • Remove the 10mm bolt from the fuse box
    • Lift the fuse box and pull it aside
    • Remove the lower of the two 14mm bolts from the alternator
    • Pry out your alternator with a pry bar
  4. step : Removing the Catalytic Converter (5:47)
    • Remove the four 10mm bolts from the catalytic converter heat shield
    • Lift the heat shield up and off
    • Apply penetrating oil to the five nuts at the top of the catalytic converter
    • Raise and secure the vehicle
    • Apply penetrating oil to the three 14mm nuts at the bottom of the catalytic converter
    • Remove the three 14mm nuts from the bottom of the catalytic converter
    • If the nuts will not come off, break them off with a torch
    • Lower the vehicle to the ground
    • Remove the five 14mm nuts from the top of the catalytic converter
    • Pull the catalytic converter up and off
    • Remove the gasket from the engine head
    • Clean the gasket mounting area with emery cloth or steel wool
  5. step : Installing the New Catalytic Converter (8:46])
    • Push the new gasket onto the engine head
    • Push the donut gasket into place
    • Put the new catalytic converter into place, lining up the studs
    • Line up the studs at the top of the catalytic converter
    • Start the five 14mm nuts at the top of the catalytic converter by hand
    • Tighten the five 14mm nuts to 45 foot-pounds of torque
  6. step : Reinstalling the Alternator (10:05)
    • Put the alternator into place
    • Start the lower 14mm bolt into the alternator
    • Insert the upper 14mm bolt into the alternator
    • Tighten the lower 14mm bolt
    • Insert the two 10mm bolts into the alternator
    • Put the alternator bracket into place
    • Connect the alternator wiring harness
    • Reconnect the wire from the battery to the alternator and tighten its nut
    • Move the fuse box into place
    • Insert the 10mm bolt into the fuse box
    • Push on the fuse box cover
    • Attach a 14mm wrench to the belt tensioner
    • Loosen the tensioner
    • Pull the belt onto the alternator
    • Release the tensioner
  7. step : Reconnecting the Battery (12:03)
    • Reconnect the negative battery cable
  8. step : Reinstalling the Heat Shield (12:10)
    • Put the catalytic converter heat shield into place
    • Insert the four bolts into the heat shield
  9. step : Reinstalling the Oxygen Sensors (12:28)
    • Insert the O2 sensors with the O2 sensor socket
    • Connect the O2 Sensor wiring harnesses
    • If you had to cut the old O2 sensors, you will need new ones
    • Put the engine cover into place
    • Insert the four 5mm Allen bolts into the engine cover
  10. step : Fastening the Catalytic Converter (12:57)
    • Raise and secure the vehicle
    • Start the springs and the 14mm nuts onto the bottom of the Catalytic Converter
    • Tighten the 14mm nuts until they bottom out

Tools needed for replacement:

    Allen Wrenches

  • 5mm Allen Wrench

  • General Tools

  • Floor Jack
  • Jack Stands

  • Pliers, Cutters & misc Wrenches

  • Needle nose pliers
  • Wire Cutters

  • Ratchets & Related

  • 1/2 Inch Breaker Bar
  • Socket Extensions
  • A Piece of Pipe (for leverage)
  • Torque Wrench
  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver
  • Pry Bar

  • Sockets - Metric

  • 13mm Socket
  • 11mm Socket
  • 10mm Socket
  • 14mm Socket
  • 12mm Socket

  • Specialty Tools

  • Acetylene torch
  • O2 Sensor Socket

5.00/ 5.0
5 reviews
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VERY SATISFIED!
The part was an exact fit for my vehicle. There was no problem with installation. I am very satisfied with the parts. My wifes vehicle is repaired and running fine. I will order again. THANKS AGAIN 1A AUTO!
January 23, 2017
awsome deal
Great price for the header with cat build inside. It comes with everything you need to replace the header assy. Exhaust gasket and dohnut and both O2 sensers. Color matched and connects perfectly. Also comes with hardware for the lower dohnut 2 studs and 2 spring and 2 nuts and the head stud nuts I believe 5 nuts. Definitely will buy another one for my other Altima. Easy to install and no check engine light !
November 7, 2017
Great price
I had absolutely no problems with this part. Works as intended and car runs like a champ.
December 11, 2017
Great price & great fit
My check engine light is finally off! My direct fit replacement catalytic converter kit came as promised with a new gasket as well as a new uppper and lower O2 sensor. Extactic that I opted for the kit that came with the new sensors bc despite how careful I was with the existing sensors they both broke upon removal.... to be expected they’d been there 15 years..... The new catylatic converter I ordered from 1A Auto went into place and fit perfect with no problems at all. My check engine light has been off ever since. Very happy with my purchase from 1A Auto. I was able to repair my vehicle affordably without any problems at all. 1A Auto will remain my #1 choice for replacement parts on the internet.
August 26, 2018
it worked
I had a plenum type manifold that was cracked as well as a bad rear sensor. I replaced all parts and cleared fault code. I worked as well as engine is more responsive now.
September 16, 2018
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
Will it fit 2005 altima? 2.5
Erick R December 22, 2016
These parts are specific to 2002 - 2003 model Altimas or Sentras. For your 2005 Nissan Altima, we recommend viewing our part number 1AEEM00620 for the exhaust manifold with catalytic converter for the 2.5L engine. You would need to purchase the oxygen sensors separately however.
Alex P December 22, 2016
Year Make Model Description
2002-2003Nissan Altima Nissan Altima Catalytic Converter 4 Piece Set with Upstream Oxygen Sensor & Downstream Oxygen Sensor L4 2.5L
2002-2003Nissan Sentra Nissan Sentra Catalytic Converter 4 Piece Set with Upstream Oxygen Sensor & Downstream Oxygen Sensor L4 2.5L
Part #: 1AEEK00318


Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

How-to Video:

(13:54 min)