Oxygen O2 Sensor Spacer Adapter Bung for Catalytic Converter Check Engine Light O2 Sensor M18*1.5 for Automobiles This product is designed to address the P0420 diagnostic trouble code related to catalytic converter efficiency. Key Features: - Precision-machined threads for accurate fit and reliable performance - Constructed from high-quality stainless steel for durability and resistance to corrosion - Simple, robust design that resists deformation - Universal fit for vehicles with M18 x 1.5 O2 sensor bung threads - Direct bolt-on installation without modifications required Product Information: - The device contains a miniature catalytic element positioned before the oxygen sensor to help maintain proper exhaust gas readings - Helps prevent check engine light activation caused by removal of the main catalytic converter - Designed to simulate the presence of a functioning catalytic converter to the vehicle’s ECU - When the primary catalytic converter is removed, the downstream O2 sensor may detect abnormal oxygen levels and unburned fuel, triggering fault codes such as P0420 or P0430 - This unit helps reduce the likelihood of these codes by stabilizing sensor feedback Important Notes: - This product addresses only certain causes of the check engine light, specifically P0420 (Catalyst System Efficiency Below Threshold) - It will not resolve issues caused by faulty O2 sensors or other emission system malfunctions - If the O2 sensor is overly sensitive or malfunctioning, the check engine light may remain on even after installation - Not intended to bypass or disable emissions systems in violation of local laws - For off-road use only. Not legal for use on public roads in all jurisdictions Specifications: - Material: Stainless Steel - Weight: 44g - Dimensions: Approximately 4.7 x 2.5 x 3cm (1.85 x 0.98 x 1.18 inches) - Thread Size: M18 x 1.5 Package Includes: 1 x O2 Sensor Spacer Adapter Installation & Usage: - Professional installation is recommended - Verify compatibility with your vehicle’s O2 sensor thread size before purchase - Actual product color may vary slightly due to lighting or screen settings - Slight dimensional variations may occur due to manual measurement