Dorman Door Ajar Switch 901-351 — Direct-Fit Jamb Switch for Ford/Lincoln/Mercury, OEM-Style & Durable

The Dorman 901-351 Door Ajar Switch is a direct-fit replacement jamb switch engineered to restore proper door-open detection and interior light operation on compatible Ford, Lincoln, and Mercury vehicles.

If your vehicle’s dome light stays on, the door-ajar warning stays lit, or the courtesy lights behave inconsistently, a worn or failed door jamb switch is often the culprit. The Dorman 901-351 is manufactured to match the look and function of the original equipment on many Ford, Lincoln and Mercury models from the early 2000s through the early 2010s. Built from quality materials and supported by Dorman’s product expertise, this switch aims to deliver the same fit, function, and durability as the factory-installed component.

How does this switch restore normal door and light behavior?

When the jamb switch fails, the car’s electrical system can’t reliably detect whether a door is open or closed. Replacing the faulty switch with the Dorman 901-351 reestablishes that circuit so interior lights, door chimes, and dash warnings operate correctly. Installation is straightforward on most applications because it is designed to match OEM mounting and electrical connections.

• Replaces worn or broken original jamb switch to stop false door-ajar warnings
• Restores courtesy and dome light control tied to door position
• Designed for OEM-style fit and connector compatibility

Which vehicles will this part fit and how can I confirm fitment?

The Dorman 901-351 supports a wide range of Ford, Lincoln and Mercury vehicles including select years of F-Series trucks, Explorer, Fusion, Ranger, and several Lincoln/Mercury models. Because sub-models and trims can vary, use the site’s garage tool and enter your exact make, model and trim to verify compatibility before purchase.

• Compatible with many Ford F-150, F-250, F-350, F-450 and F-550 model years listed
• Also fits Ford Explorer, Fusion, Ranger, Taurus and Focus among others
• Includes coverage for Lincoln and Mercury models such as MKZ, Town Car, Milan

What are the construction and quality features of this replacement switch?

Dorman builds the 901-351 from durable materials intended to withstand repeated use in the door jamb environment. The part is engineered to meet or approximate the original switch’s dimensions, actuator shape, and electrical characteristics so it performs reliably over time.

• Durable construction for long service life in daily use
• Manufactured to match original switch appearance and function
• Backed by Dorman’s product support and decades of automotive experience

How difficult is installation and what should I prepare?

Installation is typically simple and can be completed with basic hand tools. In many vehicles the switch pops out of the jamb or unscrews, and the electrical connector unplugs. If you’re unsure, consult a repair manual or a professional technician to avoid damage to the door trim or wiring.

• Basic removal and reinstallation — often a push-in or screw-in swap
• Unplug the electrical connector and match the replacement’s actuator orientation
• Check operation after install: lights, chimes, and dash indicators

Who is this for: The Dorman 901-351 Door Ajar Switch is aimed at vehicle owners, DIY mechanics, and professional technicians who need a reliable, OEM-style replacement for a failed door jamb switch on compatible Ford, Lincoln, or Mercury models. If you’re troubleshooting interior lighting issues or persistent door-ajar warnings and your vehicle is listed in the fitment range, this switch provides a cost-effective repair that restores normal door-detection functions.