OE Aftermarket CP509A EVAP Leak Detection Pump

The OE Aftermarket CP509A is a direct-fit replacement Evaporative Emission Control (EVAP) System Leak Detection Pump (LDP) designed to restore proper function to your vehicle's fuel vapor management system. This pump monitors the integrity of the EVAP system by pressurizing it during the engine's self-diagnostic routine, allowing the ECU to detect fuel vapor leaks as small as 0.020 inches in diameter.

A failed or degraded leak detection pump commonly triggers a Check Engine Light along with EVAP-related diagnostic trouble codes (DTCs) such as P0455, P0456, and P1425. Replacing the pump with this OE-quality unit restores accurate leak monitoring and clears emissions-related faults.

Key Features:

• Direct OE replacement — matches the fit, form, and function of the original pump
• Precision-calibrated internal diaphragm and spring for accurate pressure monitoring
• High-temperature plastic housing engineered for underhood durability
• OE-style connector and terminals for a precise, plug-and-play installation
• Restores proper EVAP system diagnostics and emissions compliance
• Helps eliminate Check Engine Light caused by EVAP leak detection faults

The CP509A is built to meet or exceed original equipment specifications, making it a reliable solution for restoring your vehicle's evaporative emissions system without the cost of an OEM part.