How to diagnose and repair a malfunctioning catalytic converter on Toyota Tundra?

The catalytic converter is an emission control device that reduces pollutants in the exhaust gas stream. It consists of two types of catalysts, the oxidation catalyst and the reduction catalyst, which work together to reduce hydrocarbon, carbon monoxide, and oxides of nitrogen emissions. If you suspect a malfunctioning converter, have it diagnosed and repaired by a dealer or authorized emissions inspection facility. Regular inspections should be done for leaks, corrosion, dents, and other damage. If any damage is found, replace the converter. To check for a restricted converter, use a vacuum gauge to diagnose the effect of a blocked exhaust on intake vacuum. If the exhaust system is restricted, replace the catalytic converter.

Genuine Toyota Tundra Catalytic Converter

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42 Catalytic Converters found

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Toyota Tundra Left Exhaust Manifold Sub-Assembly
Part Number: 17105-50190
$302.77 MSRP: $434.15
You Save: $131.38 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Lh; Exhaust Manifold
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2006 Toyota Tundra | DLX, Limited, SR5 | 8 Cyl 4.7L | 2UZFE; 2UZFE; UCK30L-ARBLKA, UCK30L-ARBSKA, UCK30L-ARBSKK, UCK30L-ARSLKA, UCK30L-ARSSKA, UCK30L-ARSSKK, UCK30L-ASBLKA, UCK30L-ASBSKA, UCK30L-ASSLKA, UCK30L-ASSSKA, UCK30L-TRBDKA, UCK31L-PRBLKA, UCK31L-PRBSKA, UCK31L-PRBSKK, UCK31L-PRSLKA, UCK31L-PRSSKA, UCK31L-PRSSKK, UCK40L-ARBLKA, UCK40L-ARBLKK, UCK40L-ARBSKA, UCK40L-ARBSKK, UCK40L-ARSLKA, UCK40L-ARSLKK, UCK40L-ARSSKA, UCK40L-ARSSKK, UCK40L-ASBLKA, UCK40L-ASBSKA, UCK40L-ASSLKA, UCK40L-ASSSKA, UCK40L-TRBDKA, UCK40L-TRBDKK, UCK40L-TRSDKK, UCK40L-TRSSKA, UCK41L-PRBLKA, UCK41L-PRBLKK, UCK41L-PRBSKA, UCK41L-PRBSKK, UCK41L-PRSLKA, UCK41L-PRSLKK, UCK41L-PRSSKA, UCK41L-PRSSKK
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Toyota Tundra Right Exhaust Manifold Sub-Assembly
Part Number: 17104-50200
$302.77 MSRP: $434.15
You Save: $131.38 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Rh; Exhaust Manifold
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2006 Toyota Tundra | DLX, Limited, SR5 | 8 Cyl 4.7L | 2UZFE; 2UZFE; UCK30L-ARBLKA, UCK30L-ARBSKA, UCK30L-ARBSKK, UCK30L-ARSLKA, UCK30L-ARSSKA, UCK30L-ARSSKK, UCK30L-ASBLKA, UCK30L-ASBSKA, UCK30L-ASSLKA, UCK30L-ASSSKA, UCK30L-TRBDKA, UCK31L-PRBLKA, UCK31L-PRBSKA, UCK31L-PRBSKK, UCK31L-PRSLKA, UCK31L-PRSSKA, UCK31L-PRSSKK, UCK40L-ARBLKA, UCK40L-ARBLKK, UCK40L-ARBSKA, UCK40L-ARBSKK, UCK40L-ARSLKA, UCK40L-ARSLKK, UCK40L-ARSSKA, UCK40L-ARSSKK, UCK40L-ASBLKA, UCK40L-ASBSKA, UCK40L-ASSLKA, UCK40L-ASSSKA, UCK40L-TRBDKA, UCK40L-TRBDKK, UCK40L-TRSDKK, UCK40L-TRSSKA, UCK41L-PRBLKA, UCK41L-PRBLKK, UCK41L-PRBSKA, UCK41L-PRBSKK, UCK41L-PRSLKA, UCK41L-PRSLKK, UCK41L-PRSSKA, UCK41L-PRSSKK
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Toyota Tundra Right Exhaust Manifold Sub-Assembly
Part Number: 17104-50151
$302.77 MSRP: $434.15
You Save: $131.38 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Rh; Exhaust Manifold
- Position: Passenger Side
- Replaces: 17104-50150
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2005 Toyota Tundra | DLX, Limited, SR5 | 8 Cyl 4.7L | 2UZFE; 2UZFE; UCK30L-ARBLKA, 2UZFE; UCK30L-ARSLKA, UCK30L-ARBSKA, UCK30L-ARBSKK, UCK30L-ARSLKA, UCK30L-ARSLKK, UCK30L-ARSSKA, UCK30L-ARSSKK, UCK30L-ASBLKA, UCK30L-ASBSKA, UCK30L-ASSLKA, UCK30L-ASSSKA, UCK30L-TRBDKA, UCK31L-PRBLKA, UCK31L-PRBSKA, UCK31L-PRBSKK, UCK31L-PRSLKA, UCK31L-PRSSKA, UCK31L-PRSSKK, UCK40L-ARBLKA, UCK40L-ARBLKK, UCK40L-ARBSKA, UCK40L-ARBSKK, UCK40L-ARSLKA, UCK40L-ARSLKK, UCK40L-ARSSKA, UCK40L-ARSSKK, UCK40L-ASBLKA, UCK40L-ASBSKA, UCK40L-ASSLKA, UCK40L-ASSSKA, UCK40L-TRBDKA, UCK40L-TRBDKK, UCK40L-TRSDKK, UCK40L-TRSSKA, UCK41L-PRBLKA, UCK41L-PRBLKK, UCK41L-PRBSKA, UCK41L-PRBSKK, UCK41L-PRSLKA, UCK41L-PRSLKK, UCK41L-PRSSKA, UCK41L-PRSSKK
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Toyota Tundra Left Exhaust Manifold Sub-Assembly
Part Number: 17105-38011
$415.06 MSRP: $610.96
You Save: $195.90 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Manifold Sub-Assembly, Exhaust, Lh; Exhaust Manifold
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2007-2021 Toyota Tundra | Limited, Platinum, SR5 | 8 Cyl 5.7L | 3URFBE, 3URFE; 3URFBE, 3URFE; USK50L-TRTDKA, USK51L-CRTLGA, USK51L-CRTLKA, USK51L-CRTSGA, USK51L-CRTSKA, USK51L-PSTLGA, USK51L-PSTLKA, USK51L-PSTSGA, USK51L-PSTSKA, USK51L-PSTZGA, USK51L-PSTZKA, USK51L-THTDKA, USK51L-THTSGA, USK51L-THTSKA, USK52L-CHTSGA, USK52L-CHTSKA, USK55L-TRTDGA, USK55L-TRTDKA, USK56L-CRTLGA, USK56L-CRTLKA, USK56L-CRTSGA, USK56L-CRTSKA, USK56L-PSTLGA, USK56L-PSTLKA, USK56L-PSTSGA, USK56L-PSTSKA, USK56L-PSTZGA, USK56L-PSTZKA, USK56L-THTDGA, USK56L-THTDKA, USK56L-THTSGA, USK56L-THTSKA, USK57L-CHTSGA, USK57L-CHTSKA
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Toyota Tundra CONVERTER ASSY, W/CA
Part Number: 17500-F4020
$986.82 MSRP: $1452.59
You Save: $465.77 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2022 Toyota Tundra
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Toyota Tundra Front Exhaust Pipe Assembly
Part Number: 17410-0F050
$1259.32 MSRP: $1697.85
You Save: $438.53 (26%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Pipe Assy, Exhaust, Front; Front Pipe
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2006 Toyota Tundra | DLX, Limited, SR5 | 8 Cyl 4.7L | 2UZFE; 2UZFE; UCK30L-ARBLKA, UCK30L-ARBSKA, UCK30L-ARBSKK, UCK30L-ARSLKA, UCK30L-ARSSKA, UCK30L-ARSSKK, UCK30L-ASBLKA, UCK30L-ASBSKA, UCK30L-ASSLKA, UCK30L-ASSSKA, UCK30L-TRBDKA, UCK31L-PRBLKA, UCK31L-PRBSKA, UCK31L-PRBSKK, UCK31L-PRSLKA, UCK31L-PRSSKA, UCK31L-PRSSKK, UCK40L-ARBLKA, UCK40L-ARBLKK, UCK40L-ARBSKA, UCK40L-ARBSKK, UCK40L-ARSLKA, UCK40L-ARSLKK, UCK40L-ARSSKA, UCK40L-ARSSKK, UCK40L-ASBLKA, UCK40L-ASBSKA, UCK40L-ASSLKA, UCK40L-ASSSKA, UCK40L-TRBDKA, UCK40L-TRBDKK, UCK40L-TRSDKK, UCK40L-TRSSKA, UCK41L-PRBLKA, UCK41L-PRBLKK, UCK41L-PRBSKA, UCK41L-PRBSKK, UCK41L-PRSLKA, UCK41L-PRSLKK, UCK41L-PRSSKA, UCK41L-PRSSKK
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Toyota Tundra CONVERTER ASSY, W/CA
Part Number: 17400-F4020
$996.54 MSRP: $1466.89
You Save: $470.35 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2022 Toyota Tundra
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Toyota Tundra Left Exhaust Manifold Sub-Assembly
Part Number: 17105-50151
$302.77 MSRP: $434.15
You Save: $131.38 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Lh; Exhaust Manifold
- Position: Driver Side
- Replaces: 17105-50150
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2005 Toyota Tundra | DLX, Limited, SR5 | 8 Cyl 4.7L | 2UZFE; 2UZFE; UCK30L-ARBLKA, 2UZFE; UCK30L-ARSLKA, UCK30L-ARBSKA, UCK30L-ARBSKK, UCK30L-ARSLKA, UCK30L-ARSLKK, UCK30L-ARSSKA, UCK30L-ARSSKK, UCK30L-ASBLKA, UCK30L-ASBSKA, UCK30L-ASSLKA, UCK30L-ASSSKA, UCK30L-TRBDKA, UCK31L-PRBLKA, UCK31L-PRBSKA, UCK31L-PRBSKK, UCK31L-PRSLKA, UCK31L-PRSSKA, UCK31L-PRSSKK, UCK40L-ARBLKA, UCK40L-ARBLKK, UCK40L-ARBSKA, UCK40L-ARBSKK, UCK40L-ARSLKA, UCK40L-ARSLKK, UCK40L-ARSSKA, UCK40L-ARSSKK, UCK40L-ASBLKA, UCK40L-ASBSKA, UCK40L-ASSLKA, UCK40L-ASSSKA, UCK40L-TRBDKA, UCK40L-TRBDKK, UCK40L-TRSDKK, UCK40L-TRSSKA, UCK41L-PRBLKA, UCK41L-PRBLKK, UCK41L-PRBSKA, UCK41L-PRBSKK, UCK41L-PRSLKA, UCK41L-PRSLKK, UCK41L-PRSSKA, UCK41L-PRSSKK
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Toyota Tundra Front Exhaust Pipe Assembly
Part Number: 17410-0S020
$1396.76 MSRP: $1883.15
You Save: $486.39 (26%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Pipe Assembly, Exhaust, Front; Front Pipe
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2009-2014 Toyota Tundra | Limited, SR5 | 8 Cyl 4.6L | 1URFE; 1URFE; UPK50L-TRTDKA, UPK51L-CRTLKA, UPK51L-CRTSKA, UPK51L-PSTLKA, UPK51L-PSTSKA, UPK51L-THTDKA, UPK52L-CHTSKA, UPK55L-TRTDKA, UPK56L-CRTLKA, UPK56L-CRTSKA, UPK56L-PSTLKA, UPK56L-PSTSKA, UPK56L-THTDKA, UPK57L-CHTSKA
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Toyota Tundra Exhaust Manifold
Part Number: 17141-62100
$195.90 MSRP: $280.92
You Save: $85.02 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Manifold, Exhaust
- Replaced by: 17141-62110
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2001 Toyota Tundra | DLX, Limited, SR5 | 6 Cyl 3.4L | 5VZFE; 5VZFE; VCK30L-ARMSKA, VCK30L-ARSLKA, VCK30L-ARSSKA, VCK30L-TRMDKA, VCK30L-TRSDKA, VCK40L-ARMSKA, VCK40L-ARSLKA, VCK40L-ARSSKA, VCK40L-TRMSKA, VCK40L-TRSSKA
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Toyota Tundra Left Exhaust Manifold Sub-Assembly
Part Number: 17150-31170
$297.30 MSRP: $426.30
You Save: $129.00 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Lh; Exhaust Manifold
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2007-2011 Toyota Tundra | SR5 | 6 Cyl 4.0L | 1GRFE; 1GRFE; GSK50L-TRADKA, GSK51L-CRASKA, GSK51L-THADKA
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Toyota Tundra Front Exhaust Pipe Assembly
Part Number: 17410-0S090
$1147.65 MSRP: $1547.30
You Save: $399.65 (26%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Pipe Assembly, Exhaust, Front; Front Pipe
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2013-2020 Toyota Tundra | SR5 | 8 Cyl 4.6L | 1URFE; 1URFE; UPK50L-TRTDKA, UPK51L-CRTSKA, UPK51L-PSTSKA, UPK56L-CRTSKA, UPK56L-PSTSKA
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Toyota Tundra Right Exhaust Manifold Sub-Assembly
Part Number: 17104-38011
$415.06 MSRP: $610.96
You Save: $195.90 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Manifold Sub-Assembly, Exhaust, Rh; Exhaust Manifold
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2007-2021 Toyota Tundra | Limited, Platinum, SR5 | 8 Cyl 5.7L | 3URFBE, 3URFE; 3URFBE, 3URFE; USK50L-TRTDKA, USK51L-CRTLGA, USK51L-CRTLKA, USK51L-CRTSGA, USK51L-CRTSKA, USK51L-PSTLGA, USK51L-PSTLKA, USK51L-PSTSGA, USK51L-PSTSKA, USK51L-PSTZGA, USK51L-PSTZKA, USK51L-THTDKA, USK51L-THTSGA, USK51L-THTSKA, USK52L-CHTSGA, USK52L-CHTSKA, USK55L-TRTDGA, USK55L-TRTDKA, USK56L-CRTLGA, USK56L-CRTLKA, USK56L-CRTSGA, USK56L-CRTSKA, USK56L-PSTLGA, USK56L-PSTLKA, USK56L-PSTSGA, USK56L-PSTSKA, USK56L-PSTZGA, USK56L-PSTZKA, USK56L-THTDGA, USK56L-THTDKA, USK56L-THTSGA, USK56L-THTSKA, USK57L-CHTSGA, USK57L-CHTSKA
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Toyota Tundra Left Exhaust Manifold Sub-Assembly
Part Number: 17150-0P020
$713.70 MSRP: $1050.57
You Save: $336.87 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Lh
- Position: Driver Side
- Replaced by: 17150-0P260
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2006 Toyota Tundra | DLX, SR5 | 6 Cyl 4.0L | 1GRFE; 1GRFE; GSK30L-ARBSKA, GSK30L-ARFSKA, GSK30L-TRBDKA, GSK30L-TRBDKK, GSK30L-TRFDKA
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Toyota Tundra Exhaust Manifold Assembly
Part Number: 17140-38040
$342.50 MSRP: $491.12
You Save: $148.62 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Manifold Assembly, Exhaust; Exhaust Manifold
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2009-2020 Toyota Tundra | Limited, SR5 | 8 Cyl 4.6L | 1URFE; 1URFE; UPK50L-TRTDKA, UPK51L-CRTLKA, UPK51L-CRTSKA, UPK51L-PSTLKA, UPK51L-PSTSKA, UPK51L-THTDKA, UPK52L-CHTSKA, UPK55L-TRTDKA, UPK56L-CRTLKA, UPK56L-CRTSKA, UPK56L-PSTLKA, UPK56L-PSTSKA, UPK56L-THTDKA, UPK57L-CHTSKA
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Toyota Tundra Right Exhaust Manifold Sub-Assembly
Part Number: 17140-0P010
$713.70 MSRP: $1050.57
You Save: $336.87 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Rh
- Position: Passenger Side
- Replaced by: 17140-0P260
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2006 Toyota Tundra | DLX, SR5 | 6 Cyl 4.0L | 1GRFE; 1GRFE; GSK30L-ARBSKA, GSK30L-ARFSKA, GSK30L-TRBDKA, GSK30L-TRBDKK, GSK30L-TRFDKA
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Toyota Tundra Front Exhaust Pipe Assembly
Part Number: 17410-0S010
$1470.64 MSRP: $1982.76
You Save: $512.12 (26%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Pipe Assy, Exhaust, Front
- Position: Front
- Replaced by: 17410-0S011
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2007-2010 Toyota Tundra | Limited, SR5 | 8 Cyl 5.7L | 3URFBE, 3URFE; 3URFBE, 3URFE; USK50L-TRTDKA, USK51L-CRTLKA, USK51L-CRTSKA, USK51L-PSTLKA, USK51L-PSTSKA, USK51L-THTDKA, USK52L-CHTSKA, USK55L-TRTDGA, USK55L-TRTDKA, USK56L-CRTLGA, USK56L-CRTLKA, USK56L-CRTSGA, USK56L-CRTSKA, USK56L-PSTLGA, USK56L-PSTLKA, USK56L-PSTSGA, USK56L-PSTSKA, USK56L-THTDGA, USK56L-THTDKA, USK57L-CHTSGA, USK57L-CHTSKA
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Toyota Tundra Front Exhaust Pipe Assembly
Part Number: 17410-0F010
$1204.34 MSRP: $1623.73
You Save: $419.39 (26%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Pipe Assy, Exhaust, Front; Front Pipe
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2003 Toyota Tundra | DLX, Limited, SR5 | 8 Cyl 4.7L | 2UZFE; 2UZFE; UCK30L-ARSLKA, UCK30L-ARSLKK, UCK30L-ARSSKA, UCK30L-ARSSKK, UCK30L-ASSLKA, UCK30L-ASSSKA, UCK40L-ARSLKA, UCK40L-ARSLKK, UCK40L-ARSSKA, UCK40L-ARSSKK, UCK40L-ASSLKA, UCK40L-ASSSKA, UCK40L-TRSDKK, UCK40L-TRSSKA
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Toyota Tundra PIPE ASSY, EXHAUST
Part Number: 17410-F4010
$125.23 MSRP: $163.06
You Save: $37.83 (24%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2022 Toyota Tundra
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Toyota Tundra Front Exhaust Pipe Assembly
Part Number: 17410-07041
Product Specifications
- Other Name: Pipe Assy, Exhaust, Front; Catalytic Converter, Front Pipe
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2002-2005 Toyota Tundra | DLX, Limited, SR5 | 6 Cyl 3.4L | 5VZFE; 5VZFE; VCK30L-ARMSKA, VCK30L-ARSLKA, VCK30L-ARSSKA, VCK30L-TRMDKA, VCK30L-TRMDKK, VCK30L-TRSDKA, VCK30L-TRSDKK, VCK40L-ARMSKA, VCK40L-ARSLKA, VCK40L-ARSSKA, VCK40L-ARSSKK, VCK40L-TRMSKA, VCK40L-TRSDKK, VCK40L-TRSSKA

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Toyota Tundra Catalytic Converter

Another important part of the Toyota model is the Tundra Catalytic Converter's that bears the brunt of reducing some of the most dangerous toxic exhaust fumes into acceptable emissions. The destructive exhaust emission control system of the given car element uses redox reaction that cleans the toxic chemicals and produces water, oxygen and other low hazardous substances. Throughout the years, various kinds of Catalytic Converters have been installed in Tundra vehicles starting from the two-way then the three-way that also minimizes oxides of nitrogen. Such converters usually have ceramic honeycombs plated with platinum, palladium, and rhadium, and work only at the stoichiometric air-fuel ratio. Thus, the efficiency and durability of Toyota Tundra Catalytic Converter can be preserved through avoiding those risky driving behaviors and silicone sealing products. By application of these devices the auto industry has been able to exhibit considerable improvements in elimination of hazardous substances and environmental degradation.

If you are in demand for superior quality and affordable OEM Toyota Tundra Catalytic Converter, then shop with us! We own a wide range of the reduced-priced genuine Toyota Tundra Catalytic Converter. You can purchase in confidence as all parts come with a manufacturer's warranty. Any issues with our products? No need to worry as we have a hassle-free return policy to guide you every step of the way.

Toyota Tundra Catalytic Converter Parts Questions & Experts Answers

Right Exhaust Manifold Sub-Assembly
17140-31730
Q: How to diagnose and repair a malfunctioning catalytic converter on Toyota Tundra?
A: The catalytic converter is an emission control device that reduces pollutants in the exhaust gas stream. It consists of two types of catalysts, the oxidation catalyst and the reduction catalyst, which work together to reduce hydrocarbon, carbon monoxide, and oxides of nitrogen emissions. If you suspect a malfunctioning converter, have it diagnosed and repaired by a dealer or authorized emissions inspection facility. Regular inspections should be done for leaks, corrosion, dents, and other damage. If any damage is found, replace the converter. To check for a restricted converter, use a vacuum gauge to diagnose the effect of a blocked exhaust on intake vacuum. If the exhaust system is restricted, replace the catalytic converter.