SPDZ1 High-Flow O2 Sensor CEL Fix with Mini Catalytic Converter –

Universal M18 x 1.5

Eliminate those annoying P0420 / P0430 “Catalyst System Efficiency Below Threshold” codes with the SPDZ1 high-flow O2 sensor adapter. Designed with an integrated miniature catalytic converter, this precision-machined fitting helps restore proper exhaust readings when running a high-flow cat, test pipe, or full race exhaust system.

Perfect for 6-cylinder boosted engines and 8-cylinder performance builds, this version ensures a cleaner signal to your ECU while keeping exhaust flow unrestricted for maximum performance. For 4-cylinder boosted or NA 6-cylinder setups, check out our smaller-flow variants.

✅ Removes common CEL codes: P0420 (Bank 1) and P0430 (Bank 2)
✅ Built-in mini catalytic converter to balance performance and emissions
✅ Universal M18 x 1.5 thread fits most O2 sensors and aftermarket exhausts
✅ Machined from high-grade stainless steel for durability and corrosion resistance
✅ Quick bolt-on installation – no tuning required

(Purchase Includes 1 Piece)

Recommended Use:
Ideal for vehicles equipped with aftermarket downpipes, test pipes, or catless exhaust systems looking to eliminate the Check Engine Light without compromising performance.