Common signs include engine misfires or rough idle, a noticeable loss of power, poor fuel economy, a strong fuel smell, black smoke from the exhaust, or a check-engine light with a misfire or fuel trim code. A genuine Delphi injector restores accurate fuel delivery and spray pattern.

Many Delphi fuel injectors carry a core charge — a deposit added at checkout that's refunded when you return your old, failed injector to be remanufactured into a future product. Check the product page for ES20109 to see if a core charge applies, and follow the included return instructions to get that deposit back.

Vapor lock occurs when fuel in the line gets too hot and partially vaporizes, disrupting fuel flow and causing engine hesitation or stalling — especially after a hot engine is shut off and restarted. Delphi injectors are designed to thermally isolate fuel from engine heat, drawing manifold heat away from the fuel rail to help prevent this issue.

Sensors like the mass air flow (MAF), oxygen (O2), and coolant temperature sensors feed critical data to your engine computer. Contamination, electrical wear, or simple age can cause inaccurate readings, leading to poor fuel economy, rough running, or a check-engine light. Delphi's sensor portfolio is backed by the same OE development and validation methods used in original equipment production.

Delphi components are built to OE specifications for fit, form, and function. Confirm the exact fuel type (gasoline/diesel), connector type, and application listed for ES20109 match your engine before ordering, since injector and sensor specs vary significantly even within similar engine families.

Many sensors (like MAF or coolant temp sensors) are straightforward DIY swaps with basic tools. Fuel injectors involve relieving fuel system pressure and can require special tools depending on the engine, so some owners choose professional installation — especially for direct injection systems, which operate at much higher pressures than port injection.

Yes. All Delphi injectors, sensors, and fuel system components sold at AutoNation Parts are 100% brand new and backed by a manufacturer warranty of at least 12 months.

You can verify exact fitment by using our vehicle selector tool at the top of the page to input your year, make, model, and trim level. We recommend cross-referencing your VIN before ordering ES20109, since injector and sensor specifications can vary even within the same engine family.

All parts sold on AutoNation's Aftermarket Store are backed by robust manufacturer warranties covering defects in materials and workmanship. Specific warranty durations vary by brand and product type; detailed warranty terms can be reviewed on our policy pages or by contacting our customer support team.

We offer a hassle-free return and exchange policy for unused items in their original, undamaged packaging within our specified return window. If you ordered the incorrect part or encounter a fitment issue with ES20109, simply initiate a return request through your account to get the right component fast.

Orders are processed quickly through our nationwide distribution network. We offer multiple shipping tiers, including standard ground and expedited delivery options, ensuring your replacement Delphi component arrives as fast as possible to minimize vehicle downtime.