Eliminate annoying Check Engine Lights (CEL) caused by catalytic converter efficiency codes with this Universal O2 Sensor Spacer featuring an Integrated Mini Catalytic Converter. Crafted from heavy-duty stainless steel with standard M18 x 1.5 threading, this mechanical fix filters exhaust gas samples directly at the downstream sensor tip—tricking the ECU into reading clean emissions without re-tuning.
Fixes Error Codes: Clears P0420 and P0430 fault codes.
Built-In Micro Catalyst: Real honeycomb converter core filters exhaust flow before reaching the sensor.
Universal Fit: Threads directly into standard M18x1.5 downstream (Sensor 2) exhaust bungs.
Plug-and-Play Installation: Direct screw-in design—no welding or wire cutting required.
When removing a failed catalytic converter, upgrading to a high-flow downpipe, or running a modified exhaust setup, the downstream oxygen sensor detects higher gas flow and unburnt fuel. This immediately triggers a Check Engine Light (CEL), throwing diagnostic codes like P0420 (Catalyst System Efficiency Below Threshold Bank 1) or P0430 (Bank 2).
Standard non-catalytic spacers simply pull the sensor out of the exhaust stream, which often fails on sensitive modern ECUs. This Universal O2 Sensor Spacer (CEL Fix M18x1.5) combines spatial restriction with a real internal ceramic honeycomb catalyst core. It cleans a small sample of the exhaust gas right before it contacts the sensor tip, providing realistic, clean readings to keep your dashboard warning-free.
Built-in Catalyst Substrate: Features a miniature ceramic honeycomb matrix inside the steel body to filter local gas samples effectively.
Precision CNC Machined: Built from durable 304 Stainless Steel to resist extreme exhaust heat, carbon buildup, and road corrosion.
Universal M18 x 1.5 Metric Threading: Matches over 99% of modern automotive downstream O2 sensors across petrol and diesel vehicles.
Integrated Perforated Cap: Diffuses incoming exhaust velocity, preventing sensor thermal shock and carbon fouling.
100% Reversible Modification: Allows you to return the vehicle back to stock configuration at any time without damaging factory wiring or exhaust bungs.
| Technical Property | Specification |
| Material | 304 High-Grade Stainless Steel |
| Thread Size | M18 x 1.5mm (Universal Downstream) |
| Internal Element | Micro Ceramic Catalytic Converter Substrate |
| Installation Type | Direct Thread-in (Mechanical Bung Spacer) |
| Application | Downstream (Sensor 2) Oxygen Sensors |
Safely jack up the vehicle and locate the downstream (Sensor 2) O2 sensor behind the catalytic converter or downpipe section.
Unplug the wire connector and unscrew the sensor using a standard O2 sensor socket or wrench.
Thread this Mini Catalyst Spacer into the empty exhaust bung.
Screw your factory O2 sensor into the back of the spacer and tighten down firmly.
Reconnect the wiring harness and clear existing error codes using a diagnostic scan tool.
Note: Designed specifically for downstream (Sensor 2) oxygen sensor diagnostic applications. This product will not replace a primary upstream (Sensor 1) O2 sensor used for fuel-mixture calculations.
