How to replace the lower catalytic converter on Mazda 3?

On all models, the "warm up" catalytic converter is an integral component of the exhaust manifold and cannot be serviced separately. To replace the lower converter, raise the vehicle and support it securely on jackstands. Remove the downstream oxygen sensor(s) from the catalyst. Next, remove the nuts and bolts that secure the flange at the front end of the catalyst to the exhaust down pipe; if the threads are severely damaged or rusted, apply some penetrant to the threads and wait a while before loosening them. Unhook the rubber mounts and remove the catalytic converter, then discard the old gasket between the exhaust down pipe and the catalyst mounting flange. Installation is the reverse of removal, ensuring to use a new gasket and, if necessary, new fasteners.

Genuine Mazda 3 Catalytic Converter

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75 Catalytic Converters found

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Mazda 3 Exhaust Manifold Part Number: PY31-20-50X
$614.65 MSRP: $839.85
You Save: $225.20 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter; Exhaust Manifold
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2016 Mazda 3 | s Grand Touring, s Touring | 4 Cyl 2.5 L GAS
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Mazda 3 Exhaust Manifold Part Number: LFK9-20-50XB
$688.14 MSRP: $940.28
You Save: $252.14 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter
- Replaced by: LFK9-20-50XD
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010-2011 Mazda 3 | i | 4 Cyl 2.0 L GAS
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Mazda 3 Exhaust Manifold Part Number: PE3D-20-50X
$703.29 MSRP: $960.97
You Save: $257.68 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter; Exhaust Manifold
- Replaces: PEB4-20-50X, PEB4-20-50XA
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2016 Mazda 3 | i Grand Touring, I Sport, i SV, I Touring | 4 Cyl 2.0 L GAS
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Mazda 3 Exhaust Manifold Part Number: PE19-20-50XC
$730.69 MSRP: $998.42
You Save: $267.73 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter
- Replaces: PE19-20-50XA, PE19-20-50XB
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2012-2013 Mazda 3 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Manifold W/Converter Part Number: L579-20-50X
$696.88 MSRP: $952.21
You Save: $255.33 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2011 Mazda 3 | S | 4 Cyl 2.5 L GAS
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Mazda 3 Catalytic Converter Part Number: LFB6-20-55XC
$766.09 MSRP: $1046.78
You Save: $280.69 (27%)
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Product Specifications
- Other Name: Converter; Catalytic Converter
- Replaces: LFB6-20-55XB, LFB6-20-55X
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2007-2009 Mazda 3 | i | 4 Cyl 2.0 L GAS
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Mazda 3 Catalytic Converter Part Number: L3G8-20-55XC
$855.51 MSRP: $1168.97
You Save: $313.46 (27%)
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Product Specifications
- Other Name: Converter; Muffler & Pipe
- Replaces: L3G8-20-55X, L3G8-20-55XB
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2007-2009 Mazda 3 | Mazdaspeed, S | 4 Cyl 2.3 L GAS
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Mazda 3 Exhaust Manifold Part Number: PY81-20-50X
$908.51 MSRP: $1241.38
You Save: $332.87 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2017-2018 Mazda 3 | Grand Touring, Touring | 4 Cyl 2.5 L GAS
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Mazda 3 Converter & Pipe Part Number: PYDP-40-600A
$978.92 MSRP: $1337.59
You Save: $358.67 (27%)
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Product Specifications
- Other Name: Pipe, Middle; Converter & Pipe
- Position: Middle
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2023-2024 Mazda 3 | 2.5 S, Carbon Edition, Preferred, Premium, Select, Select Sport | 4 Cyl 2.5 L GAS
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Mazda 3 Exhaust Manifold Part Number: L520-20-50XE
$996.17 MSRP: $1361.16
You Save: $364.99 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter; Exhaust Manifold
- Replaces: L520-20-50XD, L520-20-50XA, L520-20-50X, L520-20-50XC
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010 Mazda 3 | S | 4 Cyl 2.5 L GAS
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Mazda 3 Catalytic Converter Part Number: L3F2-20-50XE
$1014.61 MSRP: $1386.36
You Save: $371.75 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter; Converter & Pipe
- Replaces: L3F2-20-50XC, L3F2-20-50XD
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2007-2013 Mazda 3 | Mazdaspeed, S | 4 Cyl 2.3 L GAS
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Mazda 3 Exhaust Manifold Part Number: PY48-20-50X
$1040.15 MSRP: $1421.24
You Save: $381.09 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter; Exhaust Manifold
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2016 Mazda 3 | s Grand Touring, s Touring | 4 Cyl 2.5 L GAS
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Mazda 3 Catalytic Converter Part Number: PE17-20-55X
$1044.22 MSRP: $1426.82
You Save: $382.60 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter; Catalytic Converter
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2012 Mazda 3 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda 3 Exhaust Manifold Part Number: PEK8-20-50X
$1118.80 MSRP: $1528.72
You Save: $409.92 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter; Exhaust Manifold
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2018 Mazda 3 | i Grand Touring, I Sport, i SV, I Touring, Sport, Touring | 4 Cyl 2.0 L GAS
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Mazda 3 Manifold W/Converter Part Number: L577-20-50X
$1036.37 MSRP: $1416.08
You Save: $379.71 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2011 Mazda 3 | S | 4 Cyl 2.5 L GAS
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Mazda 3 Catalytic Converter Part Number: LFE4-20-55XB
$1131.07 MSRP: $1545.49
You Save: $414.42 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter; Catalytic Converter
- Replaces: L512-20-55XA, L512-20-55X, LFE4-20-55X, LFE4-20-55XA
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2010-2012 Mazda 3 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
View related parts
Mazda 3 Exhaust Manifold Part Number: PE17-20-50XC
$1146.58 MSRP: $1566.68
You Save: $420.10 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter
- Replaces: PE17-20-50XB, PE17-20-50XA
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2012 Mazda 3 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
View related parts
Mazda 3 Manifold W/Converter Part Number: PYEL-20-50X
$1084.70 MSRP: $1482.12
You Save: $397.42 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2023 Mazda 3 | 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Carbon Edition, Preferred, Premium, Select | 4 Cyl 2.5 L GAS
View related parts
Mazda 3 Exhaust Manifold Part Number: L579-20-50XA
Product Specifications
- Other Name: Converter
- Replaces: L579-20-50X
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2011-2013 Mazda 3 | S | 4 Cyl 2.5 L GAS
View related parts
Mazda 3 Catalytic Converter Part Number: L3G6-20-55XC
Product Specifications
- Other Name: Converter; Catalytic Converter
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2007-2009 Mazda 3 | Mazdaspeed, S | 4 Cyl 2.3 L GAS

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Mazda 3 Catalytic Converter

The Mazda 3 Catalytic Converter occupies the exhaust stream and the key benefit is its ability to reduce toxic fumes before they are released through the tailpipe, thereby making drives cleaner for people and the planet. It pushes hot gases through a platinum, palladium, and rhodium-coated ceramic honeycomb, which makes carbon monoxide and unburned hydrocarbons become carbon dioxide and water, and liberates oxygen from nitrogen oxides so harmless nitrogen may escape. This Catalytic Converter is highly efficient in cases in which the engine has a balanced air-fuel mixture. The early Mazda vehicles were based on a two-way setup that only dealt with carbon monoxide and hydrocarbons, though by the time the subsequent 3 models appeared the company switched to the more efficient three-way setup that also addresses nitrogen oxides and matches the current emission regulations. The exchange provided an additional layer of reaction but the resistance to flow was low such that drivers continue to experience rapid acceleration. When melted or coated due to overheating caused by a misfired engine, fuel-rich running, or coolant and oil leaks, it will rattle, reduce power, cause the check engine lamp to illuminate, and fail smog checks. The shell may also be dented or the inner core may collapse due to road debris, limiting exhaust flow and increasing backpressure. Once a Mazda Catalytic Converter has become clogged, replacing the unit makes performance normal again and emissions do not exceed the limit. Precious metals are buried in the Mazda Catalytic Converter, hence thieves tend to target it, which can be minimized by using secure parking and shields.

Looking for Catalytic Converter with proven quality? Choose OEM Catalytic Converter. Mazda designs and builds them to strict factory specs. Every piece goes through rigorous quality checks. You'll get parts that fit right and work like new. Shop our huge inventory of OEM Mazda 3 parts. Enjoy the highly competitive prices online. Our site is your one-stop shop. Each genuine 3 part includes a manufacturer's warranty. Buy with confidence. Our return policy is simple and hassle-free. In a rush? Choose expedited delivery at checkout. You'll love the streamlined experience from search to checkout to receiving your order.

Mazda 3 Catalytic Converter Parts and Q&A

Manifold W/Converter
L577-20-50X
Q: How to replace the lower catalytic converter on Mazda 3?
A:
On all models, the "warm up" catalytic converter is an integral component of the exhaust manifold and cannot be serviced separately. To replace the lower converter, raise the vehicle and support it securely on jackstands. Remove the downstream Oxygen Sensor(s) from the catalyst. Next, remove the nuts and bolts that secure the flange at the front end of the catalyst to the exhaust down pipe; if the threads are severely damaged or rusted, apply some penetrant to the threads and wait a while before loosening them. Unhook the rubber mounts and remove the catalytic converter, then discard the old gasket between the exhaust down pipe and the catalyst mounting flange. Installation is the reverse of removal, ensuring to use a new gasket and, if necessary, new fasteners.