What is the purpose and function of a catalytic converter in an exhaust system on 2002 through 2006 Toyota Avalon?

Since there was an extended warranty on emissions-related components resulting from a Federally required regulation such as the catalytic converter, it will be wise to seek advice from the dealer's service department before going for a replacement. The catalytic converter serves as an emission control device in the exhaust system, designed to reduce pollutants from exhaust gases, with two types available: the ordinary oxidation cat'. which decreases the emission of hydrocarbon and carbon monoxide and the three-way cat'. which further decreases emission of oxides of nitrogen. Catalytic converters are installed in one of the forms of the depicted type in covered models; one for each bank in V6 engine models' exhaust manifold. A check for a non-functioning converter necessitates the use of expensive equipment and it is suggested that a check and fix be conducted by a dealer or an authorized emission testing center. When performing any underbody servicing, check the converter for any signs of leaks, rust, denting, and general damages usually at the weld area and flange bolts that hold the converter in the exhaust system; any sign of damages should call for change. However, plug converters are uncommon, and restricted converters can happen; a vacuum gauge can be used to fix exhaust limitations. For a restricted converter, attach a vacuum gauge to one of the intake manifold vacuum sources and collect vacuum reading when the engine is warmed and again after jerking the throttle. If there is a considerable varia-tion between the after the fourth test reading and the idle reading, then the exhaust system maybe constricted. For removal, apply the nuts on the studs of flange and then unfasten the flex section from the converter, remove the converter from the exhaust system and then fasten it again in reverse manner.

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1098 Catalytic Converters found

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Toyota Exhaust Manifold Converter Sub-Assembly, No.2
Part Number: 25052-20190
$646.69 MSRP: $809.56
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Product Specifications
- Other Name: Converter Sub-Assy, Exhaust Manifold, No.2; Exhaust Manifold, Manifold
- Manufacturer Note: *115=TOYOTA/03-/Y
Fits the following Toyota Models:
- Highlander | 2003-2007 | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
- Sienna | 2004-2007 | CE, LE, XLE | 6 Cyl 3.3L, 6 Cyl 3.5L
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Toyota Exhaust Manifold
Part Number: 17141-75080
$248.58 MSRP: $356.44
You Save: $107.86 (31%)
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Product Specifications
- Other Name: Manifold, Exhaust
Fits the following Toyota Models:
- 4Runner | 1999-2001 | LULI, SR5B, SR5V | 4 Cyl 2.7L, 6 Cyl 3.4L
- Tacoma | 1999-2004 | DLX, SR5 | 4 Cyl 2.4L, 4 Cyl 2.7L, 6 Cyl 3.4L
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Toyota Front Exhaust Pipe Assembly
Part Number: 17410-21500
$2163.48 MSRP: $2916.86
You Save: $753.38 (26%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Pipe Assy, Exhaust, Front; Exhaust Pipe, Front Pipe
- Manufacturer Note: *114=TOYOTA/GD3EA6/Y
- Position: Front
Fits the following Toyota Models:
- Prius | 2004-2009 | 4 Cyl 1.5L
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Toyota Front Exhaust Pipe Assembly
Part Number: 17410-37300
$1620.83 MSRP: $2185.25
You Save: $564.42 (26%)
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Product Specifications
- Other Name: Pipe Assembly, Exhaust, Front; Exhaust Pipe, Front Pipe
- Manufacturer Note: *114=TOYOTA/GP1TB1/Y
- Position: Front
Fits the following Toyota Models:
- Prius | 2010-2015 | E, G, L, S | 4 Cyl 1.8L
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Toyota Exhaust Manifold Converter Sub-Assembly
Part Number: 25051-28180
$1213.68 MSRP: $1519.36
You Save: $305.68 (21%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter Sub-Assy, Exhaust Manifold; Exhaust Manifold
- Manufacturer Note: CALIFORNIA SPEC
Fits the following Toyota Models:
- Camry | 2002-2006 | LE, SE, XLE | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
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Toyota Exhaust Pipe Assembly
Part Number: 17410-37B52
$1068.70 MSRP: $1440.85
You Save: $372.15 (26%)
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Product Specifications
- Other Name: Pipe Assy Exhaust; Front Pipe
- Manufacturer Note: *114=TOYOTA/TL3/Y
- Position: Front
- Replaces: 17410-37A00, 17410-37B50
Fits the following Toyota Models:
- Prius | 2016-2020 | 4 Cyl 1.8L
- Prius AWD-e | 2019-2020 | 4 Cyl 1.8L
- Prius Prime | 2017-2020 | 4 Cyl 1.8L
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Toyota Exhaust Manifold Assembly
Part Number: 17150-50050
$678.33 MSRP: $998.49
You Save: $320.16 (33%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Manifold Assembly, Exhaust; Exhaust Manifold
Fits the following Toyota Models:
- 4Runner | 2004-2009 | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L
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Toyota Right Exhaust Manifold Sub-Assembly
Part Number: 17140-20030
$517.78 MSRP: $762.16
You Save: $244.38 (33%)
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Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Rh; Exhaust Manifold
- Position: Passenger Side
Fits the following Toyota Models:
- Sienna | 2004-2007 | CE, LE, XLE | 6 Cyl 3.3L, 6 Cyl 3.5L
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Toyota Exhaust Manifold Converter Sub-Assembly
Part Number: 25051-20040
$676.97 MSRP: $847.47
You Save: $170.50 (21%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Sub-Assy, Exhaust Manifold; Exhaust Manifold, Manifold
- Manufacturer Note: *115=TOYOTA/03-/Y
Fits the following Toyota Models:
- Highlander | 2003-2007 | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L
- Sienna | 2004-2007 | CE, LE, XLE | 6 Cyl 3.3L, 6 Cyl 3.5L
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Toyota Exhaust Manifold Converter Sub-Assembly
Part Number: 25051-28300
$722.62 MSRP: $904.62
You Save: $182.00 (21%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Sub-Assy, Exhaust Manifold; Exhaust Manifold
- Manufacturer Note: CALIFORNIA SPEC,*195,*108
Fits the following Toyota Models:
- Camry | 2007-2010 | LE, SE, XLE | 4 Cyl 2.4L, 4 Cyl 2.5L, 6 Cyl 3.5L
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Toyota Right Exhaust Manifold Sub-Assembly
Part Number: 17140-50060
$708.72 MSRP: $1043.24
You Save: $334.52 (33%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Rh; Exhaust Manifold
- Position: Passenger Side
Fits the following Toyota Models:
- 4Runner | 2004-2009 | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L
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Toyota Front Exhaust Pipe Assembly
Part Number: 17410-38310
$1391.64 MSRP: $1876.25
You Save: $484.61 (26%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Pipe Assembly, Exhaust, Front; Converter & Pipe, Front Pipe
- Manufacturer Note: MEXICO SPEC
- Position: Front
Fits the following Toyota Models:
- Land Cruiser | 2012-2021 | 8 Cyl 5.7L
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Toyota Left Exhaust Manifold Sub-Assembly
Part Number: 17150-31250
$598.89 MSRP: $881.55
You Save: $282.66 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Lh; Exhaust Manifold
- Manufacturer Note: *114=*566
- Position: Driver Side
- Replaces: 17150-31070
Fits the following Toyota Models:
- 4Runner | 2004-2009 | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L
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Toyota Left Exhaust Manifold Sub-Assembly
Part Number: 17150-31011
$579.78 MSRP: $853.43
You Save: $273.65 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Manifold Sub-Assy, Exhaust, Lh; Exhaust Manifold
- Manufacturer Note: *115=TOYOTA/03-/Y
- Position: Driver Side
- Replaces: 17150-31010
Fits the following Toyota Models:
- 4Runner | 2003-2005 | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L
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Toyota Left Exhaust Manifold Sub-Assembly
Part Number: 17105-50190
$317.83 MSRP: $455.74
You Save: $137.91 (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
Fits the following Toyota Models:
- Sequoia | 2004-2007 | Limited, SR5 | 8 Cyl 4.7L
- Tundra | 2004-2006 | DLX, Limited, SR5 | 6 Cyl 3.4L, 6 Cyl 4.0L, 8 Cyl 4.7L
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Toyota Exhaust Manifold Converter Sub-Assembly
Part Number: 25051-28340
$641.04 MSRP: $802.48
You Save: $161.44 (21%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Converter Sub-Assy, Exhaust Manifold; Exhaust Manifold
- Replaces: 25051-28360
Fits the following Toyota Models:
- RAV4 | 2006-2009 | Limited, Sport, X | 4 Cyl 2.4L, 4 Cyl 2.5L, 6 Cyl 3.5L
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Toyota Front Exhaust Pipe Assembly
Part Number: 17410-0C200
$1385.53 MSRP: $1868.02
You Save: $482.49 (26%)
ADD TO CART
Product Specifications
- Other Name: Pipe Assembly, Exhaust, Front; Converter & Pipe, Front Pipe
- Position: Front
Fits the following Toyota Models:
- Tacoma | 2015-2023 | Base, Limited, SR5 | 4 Cyl 2.7L, 6 Cyl 3.5L, 6 Cyl 4.0L
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Toyota Left Exhaust Manifold Sub-Assembly
Part Number: 17105-50151
$317.83 MSRP: $455.74
You Save: $137.91 (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
Fits the following Toyota Models:
- Sequoia | 2001-2005 | Limited, SR5 | 8 Cyl 4.7L
- Tundra | 2000-2005 | DLX, Limited, SR5 | 6 Cyl 3.4L, 6 Cyl 4.0L, 8 Cyl 4.7L
View related parts
Toyota Front Exhaust Pipe Assembly
Part Number: 17401-66090
$1816.23 MSRP: $2448.68
You Save: $632.45 (26%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Pipe Assy, Exhaust, Front; Converter & Pipe, Front Pipe
- Position: Front
Fits the following Toyota Models:
- Land Cruiser | 1995-1997 | 6 Cyl 4.5L
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Toyota Exhaust Manifold
Part Number: 17141-F0010
$630.53 MSRP: $928.14
You Save: $297.61 (33%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Manifold, Exhaust
Fits the following Toyota Models:
- Avalon | 2020-2022 | Limited, Touring, XLE, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L
- Camry | 2018-2024 | LE, No Grade, SE, XLE, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L
- Highlander | 2020-2023 | 4 Cyl 2.4L, 4 Cyl 2.5L, 6 Cyl 3.5L
- RAV4 | 2019-2022 | 4 Cyl 2.5L
- Sienna | 2021-2023 | 4 Cyl 2.5L
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Toyota Catalytic Converter Parts Questions & Experts Answers

Exhaust Manifold Converter Sub-Assembly, No.2
25052-20090
Q: What is the purpose and function of a catalytic converter in an exhaust system on 2002 through 2006 Toyota Avalon?
A: Since there was an extended warranty on emissions-related components resulting from a Federally required regulation such as the catalytic converter, it will be wise to seek advice from the dealer's service department before going for a replacement. The catalytic converter serves as an emission control device in the exhaust system, designed to reduce pollutants from exhaust gases, with two types available: the ordinary oxidation cat'. which decreases the emission of hydrocarbon and carbon monoxide and the three-way cat'. which further decreases emission of oxides of nitrogen. Catalytic converters are installed in one of the forms of the depicted type in covered models; one for each bank in V6 engine models' exhaust manifold. A check for a non-functioning converter necessitates the use of expensive equipment and it is suggested that a check and fix be conducted by a dealer or an authorized emission testing center. When performing any underbody servicing, check the converter for any signs of leaks, rust, denting, and general damages usually at the weld area and flange bolts that hold the converter in the exhaust system; any sign of damages should call for change. However, plug converters are uncommon, and restricted converters can happen; a vacuum gauge can be used to fix exhaust limitations. For a restricted converter, attach a vacuum gauge to one of the intake manifold vacuum sources and collect vacuum reading when the engine is warmed and again after jerking the throttle. If there is a considerable varia-tion between the after the fourth test reading and the idle reading, then the exhaust system maybe constricted. For removal, apply the nuts on the studs of flange and then unfasten the flex section from the converter, remove the converter from the exhaust system and then fasten it again in reverse manner.

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