Are you dealing with an engine that stalls intermittently or a fuel pump that fails to engage?
The 645 Power Relay (4H0951253A) is a vital component in your vehicle's electrical chain, acting as the gatekeeper for high-amperage powertrain circuits. Over years of use, factory relays develop internal resistance and carbon buildup. This professional-grade relay set restores precise switching to your ignition and fuel systems, ensuring your vehicle remains dependable.
Precision Engineering for High-Load Automotive CircuitsDesigned to handle the intense heat of engine bay fuse boxes, these relays feature upgraded internal components that resist contact welding. They are a reliable replacement for original relays in vehicles compatible with Volkswagen, and fits Porsche. Replacing these high-load components often resolves persistent fault codes like P0230 (Fuel Pump Circuit) and P0688 (ECM Power) without expensive dealership diagnostics.
Applications Include:
Powertrain Management: Compatible with Volkswagen Jetta and fits A4 fuel pump power circuits.

Thermal Control: Manages radiator cooling fans for models compatible with Tiguan and fits Q5.

Chassis Systems: Compatible with Porsche Cayenne power distribution.

Ignition Support: Restores integrity to Terminal 15 and Terminal 30 circuits.

How to Choose:Before installation, verify the "645" stamp on the top of your original relay and confirm the 4-pin layout with OE part number 4H0951253A. Ensure the relay seats firmly into the socket for a vibration-resistant connection in your vehicle's electrical panel.