We Come
To You.
Car Key Programming & Diagnostics Done Right.
Mobile automotive diagnostic service for Easton, Phillipsburg, and the Lehigh Valley. Factory-level tools. Specialized diagnostic solutions. No shop required.
Our Services
Specialized mobile automotive services brought directly to your driveway, parking lot, or workplace.
Car Key Programming
Lost your keys or need a spare? We program transponder keys, smart keys, and key fobs for most domestic and Asian vehicles on-site. No tow truck needed.
Automotive Diagnostic Scanning
Check engine light on? We connect factory-grade diagnostic tools to read, interpret, and clear fault codes — and tell you exactly what it means in plain English.
Pre-Purchase Inspection
Before you buy a used car, let us scan it. We'll uncover hidden fault codes, mileage tampering flags, and electrical issues the seller doesn't want you to find.
Auto Electrical Diagnosis
Intermittent electrical gremlins, dead modules, parasitic drain — we diagnose complex electrical faults that general shops can't figure out.
Key Fob Programming & Repair
Remote not working? We program replacement key fobs and proximity remotes for most makes and models. Precision programming performed on-site using factory-authorized tools.
TPMS Sensor Programming
New wheels or a tire pressure warning that won't go away? We program and reset TPMS sensors so your system reads correctly every time.
Battery Registration & Reset
Replaced your BMW, Mercedes, or Audi battery? These vehicles require a battery registration reset or the charging system will damage the new battery. We handle it.
Module & ECU Diagnostics
Transmission control module, ABS module, BCM issues — we diagnose and in many cases reprogram or replace modules without a dealership visit.
Not sure what you need?
Call or text us and we'll help diagnose the problem before booking.
Not in the Lehigh Valley? Ship Us Your Module.
We accept mail-in BCM, TCM, ECU, and ABS module submissions from customers nationwide. Ship us your module and key for bench-testing, programming, and repair — without a dealership visit or a $3,000 quote. We've helped customers from Erie to the Gulf Coast get back on the road.
NASTF Registered Automotive Specialist
Authorized access to manufacturer security data and key programming credentials — the same access dealerships use. Not every mobile tech has this. We do.
Why Customers Choose
Key Auto Diagnostics
Dealer-Level Technology. Independent Precision. No Bureaucracy.
Family owned and operated since 1965, with 60+ years of automotive expertise and over 217 five-star reviews across our Easton and Nazareth operations. We built this service because too many car owners were being sent to the dealership for work that can be done professionally — right in their driveway.
Factory-Level Equipment
We use the same professional diagnostic tools as dealerships — not the $30 reader from the auto parts store. Fully equipped mobile units mean accurate results and real solutions at your location.
We Come to You
No tow trucks. No rental cars. No waiting rooms. We come to your home, office, or wherever your car is sitting with a fully equipped mobile unit. Most jobs are done in under an hour.
Family Owned Since 1965
Over 60 years of automotive expertise behind every job. You get the knowledge of a multi-generational specialist without the dealership markup or the shop overhead.
NASTF Registered
Key Auto Diagnostics operates under the National Automotive Service Task Force (NASTF) framework, giving us authorized access to manufacturer security data and key programming credentials — the same access dealerships use.
About Key Auto
Diagnostics
Key Auto Diagnostics is a mobile automotive diagnostic and key programming service based in the Lehigh Valley. We serve customers across Northampton County, PA and Warren & Hunterdon County, NJ.
We founded this business because too many car owners were being told they had to go to the dealership — and pay dealership prices — for services that can be done professionally right in their driveway. We bring factory-grade equipment and real expertise to you, wherever you are.
Whether you've lost your only key, your check engine light won't go off, or you're about to buy a used car and want to know what you're really getting into — we're the call you make before you waste time and money at a shop. We work on domestic, Asian, and European vehicles including Mercedes-Benz, BMW, Audi, and more.
Mobile-first, dealership-level diagnostics.
- Factory-level scan tools for modern vehicles
- Focused on diagnostics, keys, and electronics only
- Transparent pricing before we start any work
- Most services completed in under 60 minutes
Northampton County, PA · Warren County, NJ · Hunterdon County, NJ
Fleet & Infrastructure
Solutions
At Key Auto Diagnostics, we understand that for logistics and transportation hubs, a security failure is a logistical bottleneck. We provide specialized support built around your operational tempo — not ours.
Fleet Key Management
Advanced programming and duplication for commercial transport units — Class 8 trucks, delivery fleets, and service vehicles. We handle high-volume key requests with the same factory-level precision we bring to every job.
Access Control Modules
Expert diagnostic and repair services for gate modules and facility entry systems. Keep your perimeter secure and your traffic flowing — no downtime waiting on a dealer or a manufacturer's rep.
Municipal Partnerships
Trusted by local government departments for high-security infrastructure maintenance and specialized hardware integration. We understand the compliance requirements and work discreetly and efficiently.
On-Site Technical Triage
We bring dealer-level diagnostics directly to your lot, reducing downtime and eliminating towing costs. One call, one technician, one visit — your fleet stays moving.
Ready to secure your fleet?
Volume pricing and service agreements available for commercial accounts.
Frequently Asked
Questions
Answers to the questions we hear most before a customer picks up the phone. If yours isn't here, call or text us directly.
A Diagnostic Triage is a professional assessment of your vehicle's electronic systems. We connect factory-level scan tools to your OBD-II port, read all stored and pending fault codes across every module, and give you a clear, documented report of what's wrong and what it will take to fix it. You pay for our expertise and time — not a dealer's overhead.
No. We come to you. Whether your vehicle is at home, at work, or stranded in a parking lot, we bring our equipment to your location. Most services are completed on-site in under 60 minutes. Towing is only necessary in rare cases where a module replacement requires a controlled shop environment.
We work on domestic, Asian, and European vehicles — Ford, GM, Chrysler, Toyota, Honda, Nissan, Hyundai, Kia, Mercedes-Benz, BMW, Audi, Volkswagen, Volvo, and more. Some high-security European platforms require additional tooling; we'll let you know upfront if your vehicle is one of them.
Ship your BCM, TCM, ECU, ABS module, or IMMO unit to us. Include a note with your vehicle year, make, model, VIN, and a description of the fault codes or symptoms. We bench-test the module, diagnose the root cause, and either repair it or advise on replacement. We ship it back with a full diagnostic report. Use the booking form to initiate a mail-in request.
Most key programming jobs are completed in 30–60 minutes on-site. High-security European vehicles (Mercedes, BMW, Audi) or vehicles requiring BCM synchronization may take longer. We'll give you a time estimate when you book.
Yes. We offer on-site fleet triage, volume key programming, and access control module diagnostics for commercial transport companies, logistics hubs, and local government departments. Service agreements and volume pricing are available — check the 'Commercial / Fleet Account' box in the booking form and we'll follow up with commercial options.
Dealerships charge for their overhead — the building, the service writers, the waiting room coffee. We charge for the actual work. We use the same factory-authorized scan tools and key programming software as the dealer, without the 2–3 week wait or the $400 diagnostic fee just to plug in a scanner. You get dealer-level technology with independent precision.
Yes — for automotive diagnostics and key programming only. We serve Warren County and Hunterdon County NJ, including Phillipsburg, Washington, Hackettstown, Flemington, and surrounding areas. Note: our NJ services are strictly automotive electronics and key programming, not residential or commercial locksmith work.
Still have questions? We're available Mon–Sat, 7AM–7PM.
CALL OR TEXT (484) 546-5132We Serve PA & NJ
Mobile automotive diagnostic and key programming service throughout the Lehigh Valley and western New Jersey. We come to you — no shop, no tow truck required.
Pennsylvania
Northampton CountyNew Jersey
Diagnostics & Keys OnlyNote for NJ customers: We provide automotive diagnostic scanning and car key programming throughout NJ — not residential or commercial locksmith services. Don't see your town? Call or text — we likely cover it.
Call UsReady to
Book?
Call or text us to schedule. Most appointments available within 24 hours. We'll confirm your location and come to you. We respond to all inquiries within 2 hours during business hours.
NASTF Registered — authorized access to manufacturer security data and key programming credentials.