MINI CATALIZADOR®
THE DOWNSTREAM O2 SENSOR SPACER
MINI CATALIZADOR® / THE PRODUCT EXPLAINED

SAY GOODBYE TO CEL CODES

A rear O2 sensor spacer. A built-in mini catalytic converter. Designed to eliminate the Check Engine Light.

Find your configuration
M18 × 1.5PRECISION THREAD304STAINLESS STEEL5MODEL OPTIONS
90-degree Mini Catalizador with its internal honeycomb core and threaded components
01 — AN INSIDE LOOK90° CONFIGURATION
CHECK ENGINE LIGHTUNDERSTAND THE SIGNAL.
P0420BANK 1
P0430BANK 2

Catalyst-efficiency codes.
Start with the right diagnosis.

FIVE MODEL OPTIONS

CHOOSE YOUR
CONFIGURATION.

Select a model to view its fit guidance below. Swipe to explore all five options on mobile.

Selected: 90°

PERFORMANCE & INSTALLATION
95%+CEL elimination rate
99%Vehicle compatibility
10 MINTypical installation time

Results and compatibility vary by vehicle. Confirm the M18 × 1.5 downstream sensor thread and available clearance. Installation typically takes around 10 minutes; actual time depends on access, corrosion, and vehicle configuration.

01 / UNDERSTAND THE LIGHT

THE LIGHT IS A SIGNAL.
UNDERSTAND THE CAUSE.

The CEL, SES, or MIL is your vehicle’s warning that the engine-management system has detected a fault. P0420 and P0430 relate to catalyst efficiency on Bank 1 and Bank 2, respectively.

Animated check engine warning light
P0420 / P0430Bank 1 / Bank 2 · Catalyst efficiency below threshold

Possible causes include catalyst deterioration, exhaust leaks, sensor faults, or changes to the exhaust system. Diagnose the cause first: a warning code alone does not confirm that a spacer is the correct solution.

Diagnostic scanner displaying P0420 beside a vehicle engine bay
DIAGNOSE THE CAUSE FIRSTOBD-II
02 / INSIDE THE COMPONENT

Built-in Mini Catalytic Converter

Exploded and cutaway views of the built-in miniature catalytic converter

The Mini Catalizador features a durable stainless steel housing with a built-in 400-CEL mini catalytic converter, incorporating precious metals including platinum (Pt), palladium (Pd), and rhodium (Rh), along with an EU6 catalytic coating.

Designed for downstream O2 sensor applications, its integrated catalytic element helps condition exhaust gases reaching the sensor, helping stabilize sensor readings and reduce catalyst-efficiency-related check engine lights when compatible with the vehicle and the underlying issue.

Featuring a standard M18 × 1.5 thread, the Mini Catalizador is compatible with many standard oxygen sensors and is designed to provide a compact, integrated solution for downstream sensor applications.

Internal catalytic core

A compact honeycomb element is integrated into the adapter rather than leaving the extension hollow.

Thread compatibility

M18 × 1.5 thread specification. Check thread size, sensor type, and physical clearance before ordering.

Five angle options

Straight, 45°, 45° Pro, 90°, and 90° Pro configurations accommodate different installation spaces.

03 / WORKING PRINCIPLE

DESIGNED FOR THE REAR O2 SENSOR

Most gasoline vehicles with OBD-II systems use two types of oxygen sensors:

  • Upstream O2 Sensor: Monitors the air/fuel mixture to help the engine run efficiently.
  • Downstream O2 Sensor: Monitors catalytic converter performance and helps detect catalyst efficiency issues.

When the ECU detects catalyst efficiency below its expected threshold, it may trigger a Check Engine Light with codes such as P0420 or P0430.

Mini Catalizador is designed for the downstream O2 sensor, located after the main catalytic converter. Its built-in mini catalytic converter helps condition the exhaust gas sample reaching the sensor.

Important: Install only at the downstream sensor position, never at the upstream sensor.

Diagram showing upstream and downstream oxygen sensor positions around a catalytic converter
UPSTREAM ≠ DOWNSTREAMCHECK SENSOR LOCATION
  1. 01

    Exhaust gas enters

    A portion of the exhaust gas enters the spacer’s sampling passage.

  2. 02

    Gas reaches the core

    The sample passes through the miniature catalytic element inside the adapter.

  3. 03

    Helps Prevent Check Engine Lights

    The built-in mini catalytic converter treats the sampled exhaust gas, helping normalize downstream O2 sensor readings and reduce catalyst-efficiency-related Check Engine Lights.

04 / INSTALLATION & USE

EASY INSTALLATION.
PRECISE FITMENT.

No weldingNo electrical modificationsTypically under 10 min
01

Check before installation

Confirm that the sensor functions correctly, all parts are intact, and the top cover is securely fastened. Let the exhaust cool before handling.

02

Install at the rear sensor

Thread the rear O2 sensor into the spacer, then fit the assembly into the downstream sensor port. Check clearance and avoid straining the sensor wiring.

03

Do not overtighten

If you feel strong resistance while tightening, stop. Follow the applicable installation and torque guidance for your vehicle and components.

Watch Installation Video
Illustration identifying the rear oxygen sensor installation location
05 / THE THREE-STEP GUIDE

YOUR VEHICLE.
YOUR CONFIGURATION.

STEP 01

Check your thread

Confirm an M18 × 1.5 threaded downstream O2 sensor.

Installation position: Downstream / post-cat only. Not upstream / pre-cat.
STEP 02

Select your angle

Select an option to view its fit guidance.
Straight (180°)

For installations with plenty of straight-line clearance around the downstream sensor.

45°

An angled option when moderate clearance or a change in sensor direction is needed.

45° Pro

The 45° configuration with a larger internal catalytic core. Check the additional space required.

90°

A right-angle option for tighter layouts. Confirm clearance for the spacer body, sensor, and wiring.

90° Pro

The 90° configuration with a larger internal catalytic core. Physical fit and results remain vehicle-specific.

Space is limited? Consider the 90° option, then check actual dimensions before ordering.
STEP 03

Count your sensors

For applicable installations, allow 1 spacer per downstream O2 sensor. Count the actual rear sensors rather than relying only on engine size or the fault code.

1REAR O2 SENSOR1 spacer
2REAR O2 SENSORS2 spacers

Many 4-cylinder vehicles have one rear sensor; many V6/V8 vehicles have two. Layouts vary. P0420 identifies Bank 1 and P0430 identifies Bank 2, but the codes alone do not determine quantity.

06 / PRODUCT DETAILS

TECHNICAL SPECIFICATIONS.

Material
T-304 stainless steel
Thread
M18 × 1.5
Position
Downstream / post-cat
Quantity
1 spacer per rear O2 sensor
Models
Straight, 45°, 45° Pro, 90°, 90° Pro
Core
Built-in miniature catalytic element
Installation
Threaded; no welding or rewiring
Temperature
Up to 620°C — stated product rating

Confirm the specifications for the selected model.

90-degree Mini Catalizador with honeycomb core and threaded adapter components
07 / VEHICLE FITMENT

UNIVERSAL FIT. BUILT FOR 99% OF VEHICLES.

Designed to fit approximately 99% of vehicles with compatible downstream O2 sensor configurations. Featuring a standard M18 × 1.5 thread, Mini Catalizador offers broad compatibility across a wide range of turbocharged and naturally aspirated vehicles.

Actual fitment depends on the vehicle's sensor thread, exhaust layout, and available installation space.

M18 × 1.5DOWNSTREAM O2 SENSORCHECK YOUR YEAR · ENGINE · CLEARANCE

Explore common gasoline-vehicle makes below. This is a brand reference list; confirm an M18 × 1.5 downstream sensor and suitable clearance for your specific model.

01 / EUROPEAN

German marques

AudiBMWMercedes-BenzVolkswagenPorscheMINIOpelSmart
02 / EUROPEAN

British & luxury marques

Aston MartinBentleyJaguarLand RoverLotusMcLarenRolls-Royce
03 / EUROPEAN

More European marques

Alfa RomeoCitroënDaciaFerrariFiatLamborghiniLanciaMaseratiPeugeotRenaultSaabSEATŠkodaVolvo
04 / JAPANESE

Japanese marques

AcuraDaihatsuHondaInfinitiIsuzuLexusMazdaMitsubishiNissanScionSubaruSuzukiToyota
05 / AMERICAN

American marques

BuickCadillacChevroletChryslerDodgeFordGMCHummerJeepLincolnMercuryOldsmobilePontiacRamSaturn
06 / KOREAN

Korean marques

DaewooGenesisHyundaiKiaSsangYong / KGM

The brands listed above are just a few examples. Mini Catalizador fits many more makes and models.

Don't see your vehicle listed? It may still be compatible! Check your downstream O2 sensor thread and installation space to find your fit.

08 / BEFORE YOU ORDER

GOOD TO KNOW.

Q1. Why does Mini Catalizador cost more than cheaper alternatives?
Not all O2 sensor spacers are created equal. Mini Catalizador features premium T-304 stainless steel and a built-in mini catalytic converter with precious metal coatings. We focus on quality materials and reliable construction—not cutting corners to offer the lowest price. Invest in quality today and avoid unnecessary risks tomorrow.
Q2. Can cheap, low-quality products damage my vehicle?
Inferior materials and poor construction may lead to premature failure, corrosion, or installation-related problems under high exhaust temperatures. Potential repairs can cost far more than the money saved upfront. Don't risk your vehicle just to save a few dollars. Choose genuine Mini Catalizador for quality you can trust.
Q3. How do I know I'm buying a genuine Mini Catalizador?
Mini Catalizador® is the official brand, with registered trademarks and patented technology. Genuine products are sold through MiniCatalizador.com and authorized distributors. Look for our laser-engraved logo to help identify authentic products. We actively work to fight counterfeits and protect our customers. Support the original. Buy genuine Mini Catalizador.
Q4. What warranty and return protection do I get?
When you purchase directly from MiniCatalizador.com, you receive access to our official customer support and a 60-day return policy for eligible purchases, subject to our terms. Products purchased from unauthorized sellers cannot be verified by our team and are not covered by our official warranty or after-sales service. Buy direct for genuine products and support you can count on.
MINI CATALIZADOR® — IMPORTANT INFORMATIONDesigned for downstream O2 sensors to help reduce catalyst-efficiency-related check engine lights. Fits many vehicles with M18 × 1.5 sensor threads. Results vary by vehicle and application. Please verify fitment and local emissions requirements before installation.

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