Wagner Tuning Oxygen Sensor Eliminator 45° Mini Catalyst 300CPSI

Wagner Tuning Oxygen Sensor Eliminator – 45° Mini Catalyst Spacer (300CPSI)

If you’ve modified your vehicle’s exhaust system, or removed the original catalytic converter as part of a performance build, you may find that the engine management light comes on. This is often caused by the downstream oxygen sensor (also called a lambda sensor) detecting that the exhaust gases no longer match the readings the ECU expects. The Wagner Tuning Oxygen Sensor Eliminator is designed to address exactly this issue.

This unit is a 45° angled spacer that sits between the exhaust and the oxygen sensor. Built into the spacer is a small metal mini-catalyst rated at 300CPSI (cells per square inch – a measure of how fine the catalyst structure is), along with an EU6 coating. Together, these partially treat the exhaust gases that the sensor is exposed to, bringing readings closer to what the ECU (the car’s engine control unit) expects to see, helping to prevent fault codes from being triggered.

What This Part Does

When a catalytic converter is removed or replaced with a decat (a straight-through pipe with no catalyst), the downstream oxygen sensor often detects a change in exhaust gas composition and triggers a warning. This spacer repositions the sensor and uses its integrated mini-catalyst to reduce that signal discrepancy, helping to keep the engine management system happy without the need for a full replacement cat. The 45° angle is particularly useful in tight engine bays or where the sensor needs to be redirected away from direct exhaust flow.

Key Features

• 45° angled spacer design – useful where space is tight or the sensor angle needs adjusting
• Integrated metal mini-catalyst at 300CPSI for effective partial gas treatment
• EU6 coating for improved catalyst efficiency
• Designed to help avoid fault codes in vehicles with cat-monitoring (cat-control) systems

Honest Expectation Setting

Please note: while this product is designed to reduce the likelihood of catalyst-related error codes, a 100% guarantee cannot be given that the cat monitoring system on your specific vehicle will not report errors. Results can vary depending on the vehicle, ECU calibration, and the nature of the exhaust modifications made. In some cases, an ECU remap may also be required to fully resolve fault codes.

This part is best suited to vehicles running performance exhaust modifications where the original catalyst has been removed or bypassed, and where a software solution alone has not resolved sensor-related warnings.

To confirm this part fits your vehicle, please use the vehicle lookup tool on this page or check the Vehicle Fitment tab for full compatibility details.