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Shopping for 2003-Nissan-Altima
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Catalytic Converter

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Rear Catalytic Converter
A-Premium®
1-PC Catalytic Converter, Rear Side, Fit Federal Emissions, A-Premium APCCT432
4.4254 Reviews
$129.99
$136.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionRear Side
ColorNatural
Part interchange
54360, 642280, 40514, 18120, 48120
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Front Catalytic Converter with Exhaust Manifold
A-Premium®
1-PC Catalytic Converter, Front Side, Fit Federal Emissions, A-Premium APCCT284
4.4254 Reviews
$121.99
$128.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionFront Side
ColorNatural
Part interchange
641519, 40810, 16456, 16403, 18122
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2 Pcs Front Catalytic Converter
A-Premium®
2-PC Catalytic Converter, Front Driver & Passenger, Fit Federal Emissions, A-Premium APCCT060
$296.99
$312.99
Quantity Less than 3
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity2
Installation PositionFront Driver & Passenger
ColorNatural
Part interchange
641522, 40552, 641523, 40420
Show less
3 Pcs Front & Rear Catalytic Converter
A-Premium®
3-PC Catalytic Converter, Front & Rear, Fit Federal Emissions, A-Premium APCCT058
$569.99
$600.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity3
Installation PositionFront & Rear
ColorNatural
Part interchange
641522, 40552, 641523, 40420, 642264, 40553, 18316
Show less
Rear Catalytic Converter
A-Premium®
1-PC Catalytic Converter, Rear Side, Fit Federal Emissions, A-Premium APCCT076
$236.99
$249.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionRear Side
ColorNatural
Part interchange
642264, 40553, 18316
Show less
Front Driver Catalytic Converter
A-Premium®
1-PC Catalytic Converter, Front Left Driver Side, Fit Federal Emissions, A-Premium APCCT063
4.4254 Reviews
$126.99
$133.99
Quantity Less than 4
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionFront Left Driver Side
ColorNatural
Part interchange
641523, 40420
Show less
Catalytic Converter
A-Premium®
1-PC Catalytic Converter, Exhaust, Fit Federal Emissions, A-Premium APCCT337
$208.99
$219.99
Quantity Less than 4
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionExhaust
ColorNatural
Part interchange
642793, 18250
Show less
2 Pcs Front & Rear Catalytic Converter
A-Premium®
2-PC Catalytic Converter, Front & Rear, Fit Federal Emissions, A-Premium APCCT283
4.4254 Reviews
$284.99
$300.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity2
Installation PositionFront & Rear
ColorNatural
Part interchange
641519, 40810, 16456, 16403, 18122, 54360, 642280, 40514, 
...View more
Show less
Front Passenger Catalytic Converter
A-Premium®
1-PC Catalytic Converter, Front Right Passenger Side, Fit Federal Emissions, A-Premium APCCT059
$169.99
$178.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionFront Right Passenger Side
ColorNatural
Part interchange
641522, 40552
Show less
AP Emissions 608215 Catalytic Converter
AP Emissions
AP Emissions 608215 Catalytic Converter
$161.99
Quantity Less than 5
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Part interchange
608215
Show less
AP Emissions 608265 Catalytic Converter
AP Emissions
AP Emissions 608265 Catalytic Converter
$152.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Part interchange
608265
Show less
AP Emissions 608415 Catalytic Converter
AP Emissions
AP Emissions 608415 Catalytic Converter
$148.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Part interchange
608415
Show less
AP Emissions 772105 Catalytic Converter
AP Emissions
AP Emissions 772105 Catalytic Converter
$423.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Part interchange
772105
Show less
AP Emissions 772379 Catalytic Converter, Rear Side
AP Emissions
AP Emissions 772379 Catalytic Converter, Rear Side
$482.99
Only 1 item left in stock
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionRear
Part interchange
772379
Show less
AP Emissions 771409 Catalytic Converter, Front Left Driver Side
AP Emissions
AP Emissions 771409 Catalytic Converter, Front Left Driver Side
$772.99
Only 1 item left in stock
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionFront Left
Part interchange
771409
Show less
AP Emissions 771408 Catalytic Converter, Front Right Passenger Side
AP Emissions
AP Emissions 771408 Catalytic Converter, Front Right Passenger Side
$600.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionFront Right
Part interchange
771408
Show less
AP Emissions 771104 Catalytic Converter
AP Emissions
AP Emissions 771104 Catalytic Converter
$416.99
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Part interchange
771104
Show less
AP Emissions 755005 Catalytic Converter
AP Emissions
AP Emissions 755005 Catalytic Converter
$283.99
Quantity Less than 5
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Part interchange
755005
Show less
AP Emissions 754438 Catalytic Converter, Rear Side
AP Emissions
AP Emissions 754438 Catalytic Converter, Rear Side
$752.99
Only 1 item left in stock
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Installation PositionRear
Part interchange
754438
Show less
AP Emissions 751197 Catalytic Converter
AP Emissions
AP Emissions 751197 Catalytic Converter
$629.99
Quantity Less than 2
Edit ZIP code
3-year warranty
90 days free return
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2003 Nissan Altima
Item LocatedUnited States
Quantity1
Part interchange
751197
Show less
Page 1 of 4

A catalytic converter, often referred to as a "cat," is an essential component of your engine's exhaust system. This device uses catalysts to transform harmful chemicals in the exhaust gases.

What are the signs of a bad catalytic converter?

  • Check engine light
    The dashboard warning light may illuminate, indicating potential issues.
  • Decreased engine performance
    Noticeable loss of power, acceleration, or overall engine performance.
  • Poor fuel economy
    A significant drop in fuel efficiency can occur as the converter fails.
  • Excessive exhaust emissions
    Increased emissions, including a strong sulfur or rotten egg smell.
  • Rattling noises
    Unusual rattling sounds from the exhaust system, indicating internal damage.
  • Overheating
    The engine may run hotter than normal due to restricted exhaust flow.
  • Failed emissions test
    Inability to pass emissions testing due to high pollution levels.

Shop for aftermarket catalytic converters on A-Premium.com

Premium.com offers a wide range of aftermarket catalytic converters for your vehicle. Refine your search by selecting from various dimensions, inlet types, and tube materials. A-Premium team is dedicated to helping you find a compatible catalytic converter for your car. Every item in our catalog is carefully selected by our team of experts, ensuring they undergo rigorous quality checks to endure the demanding conditions of your exhaust system. Shop now to find the best deal on your new catalytic converter!