1999-2004 Discovery Secondary Air Injection Reservoir

1999–2004 Land Rover Discovery Secondary Air Injection Reservoir – Emissions Control Replacement Part – OEM WID100000

Keep your 1999–2004 Land Rover Discovery running clean and efficient with a quality Secondary Air Injection Reservoir (OEM Part # WID100000). This essential component is part of the Secondary Air Injection (SAI) system, designed to inject fresh, pressurized air into the exhaust stream during cold starts. By doing so, it helps burn off unburned fuel, speeds up catalytic converter warm-up, and reduces harmful emissions — allowing your Discovery to meet strict environmental regulations.

What is Secondary Air? Secondary air refers to fresh air introduced into the exhaust system during the first moments after engine start-up. The goal is to help the catalytic converter reach optimal operating temperature quickly, which improves fuel efficiency, reduces hydrocarbon and carbon monoxide output, and minimizes environmental impact. Without a properly functioning SAI reservoir, you may experience rough cold starts, failed emissions tests, or increased exhaust pollutants.

Key Benefits of This Replacement Reservoir:

• Exact fit for 1999–2004 Land Rover Discovery models
• OEM Part Number: WID100000
• Durable construction to withstand pressure and temperature fluctuations
• Supports cleaner exhaust emissions and improved engine performance
• Restores proper airflow to the SAI system for smoother cold starts
• Helps your vehicle remain emissions-compliant

Replacing a damaged or leaking secondary air injection reservoir ensures your Land Rover’s emission control system works as intended, protecting both performance and the environment.