How do you replace the pre-catalytic converters on BMW 335i?

N54 engines feature a separate pre-catalytic converter damped to each turbocharger, and to replace the N54 pre-catalyst, begin by removing the lower engine cover and the exhaust system. Next, at the side of the transmission, remove the holder for the oxygen sensor wiring harness and then the oxygen sensors. For the pre-catalytic converter for cylinders 1 - 3, remove the nuts and bolts from the catalytic converter bracket, support the catalytic converter while removing the clamp, and lower the converter for removal. During installation, clean the sealing surfaces and replace the seal between the converter and turbocharger, hold the catalytic converter in position using BMW special tool 18 0 110 or an equivalent, and install the clamp while checking the exhaust system for leaks. For the pre-catalytic converter for cylinders 4 - 6, first remove the pre-catalytic converter for cylinders 1 - 3 and the oxygen sensors, then support the catalytic converter, remove the clamp, and lower the converter for removal. The installation process is the same as for cylinders 1 - 3, ensuring to clean sealing surfaces, replace the seal, hold the converter in position, install the clamp, and check for leaks.

Genuine BMW 335i Catalytic Converter

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9 Catalytic Converters found

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BMW 335i Exchange Catalytic Converter Close To Engine
Part Number: 18307587609
$1261.94 MSRP: $1596.74
You Save: $334.80 (21%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Catalytic Converter, Exhaust Manifold
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2007-2010 BMW 335i | Convertible(E93), Coupe(E92)
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BMW 335i Catalytic Converter
Part Number: 18307592437
$1261.94 MSRP: $1596.74
You Save: $334.80 (21%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Exchange Exhaust Pipe Catalyst Cylinder; Converter & Pipe
- Position: Passenger Side
- Replaces: 18-30-7-553-825
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2007-2010 BMW 335i | Convertible(E93), Coupe(E92), Sedan(E90)
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BMW 335i Exchange Catalytic Converter Close To Engine
Part Number: 18328603874
$1224.56 MSRP: $1596.74
You Save: $372.18 (24%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Catalytic Converter, Preconverter
- Position: Center
- Replaces: 18-30-7-597-062
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2011-2013 BMW 335i | Convertible(E93), Coupe(E92), Sedan(E90)
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BMW 335i Exchange Catalytic Converter Close To Engine
Part Number: 18328603875
$1230.86 MSRP: $1596.74
You Save: $365.88 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalytic Converter, Converter & Pipe
- Position: Front
- Replaces: 18-32-7-602-269
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2012-2015 BMW 335i | Sedan(F30)
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BMW 335i Exchange Catalytic Converter Close To Engine
Part Number: 18328602882
$1258.16 MSRP: $1596.74
You Save: $338.58 (22%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalytic Converter, Converter & Pipe
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2012-2015 BMW 335i | Sedan(F30)
View related parts
BMW 335i Exchange Catalytic Converter Close To Engine
Part Number: 18307553594
$1261.94 MSRP: $1596.74
You Save: $334.80 (21%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Position: Front
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2007-2010 BMW 335i | Convertible(E93), Coupe(E92), Sedan(E90)
View related parts
BMW 335i Exchange Catalytic Converter Close To Engine
Part Number: 18307553595
$1261.94 MSRP: $1596.74
You Save: $334.80 (21%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Position: Rear
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2007-2010 BMW 335i | Convertible(E93), Coupe(E92), Sedan(E90)
View related parts
BMW 335i Exchange Catalytic Converter Close To Engine
Part Number: 18307587610
$1261.94 MSRP: $1596.74
You Save: $334.80 (21%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalytic Converter, Exhaust Manifold
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2007-2010 BMW 335i | Convertible(E93), Coupe(E92)
View related parts
BMW 335i Catalytic Converter
Part Number: 18307592448
$1261.94 MSRP: $1596.74
You Save: $334.80 (21%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Exchange Exhaust Pipe Catalyst Cylinder; Converter & Pipe
- Position: Driver Side
- Replaces: 18-30-7-553-824
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2007-2010 BMW 335i | Convertible(E93), Coupe(E92), Sedan(E90)

BMW 335i Catalytic Converter

If you are looking for OEM BMW 335i Catalytic Converter, we highly recommend to shop with us. Not only do we offer the most budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW 335i Catalytic Converter that come backed by the manufacturer's warranty.

BMW 335i Catalytic Converter Parts Questions & Experts Answers

Exchange Catalytic Converter Close To Engine
18307553594
Q: How do you replace the pre-catalytic converters on BMW 335i?
A: N54 engines feature a separate pre-catalytic converter damped to each Turbocharger, and to replace the N54 pre-catalyst, begin by removing the lower engine cover and the exhaust system. Next, at the side of the transmission, remove the holder for the Oxygen Sensor wiring harness and then the oxygen sensors. For the pre-catalytic converter for cylinders 1 - 3, remove the nuts and bolts from the catalytic converter bracket, support the catalytic converter while removing the clamp, and lower the converter for removal. During installation, clean the sealing surfaces and replace the seal between the converter and turbocharger, hold the catalytic converter in position using BMW special tool 18 0 110 or an equivalent, and install the clamp while checking the exhaust system for leaks. For the pre-catalytic converter for cylinders 4 - 6, first remove the pre-catalytic converter for cylinders 1 - 3 and the oxygen sensors, then support the catalytic converter, remove the clamp, and lower the converter for removal. The installation process is the same as for cylinders 1 - 3, ensuring to clean sealing surfaces, replace the seal, hold the converter in position, install the clamp, and check for leaks.

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