Diagnatech Limited is a small family run business, owned by two brothers and has been trading for over 10 years, looking after its clients best interests and of course their vehicles. Our continuing success is measured by our commitment to perfection. Here at Diagnatech we believe our workmanship and unique level of customer satisfaction should be our greatest marketing tool.

Diagnatech Limited is registered with Mercedes Benz as an official Star Partner, which allows us to use their Genuine Parts catalogues and link directly to their Uk warehouse for immediate stock levels and pricing, for convenience to our customers. We are also directly linked to the Mercedes Benz Technical information Service which allows us up to date workshop information and technical rectification notices concurrent with all official dealers.

Diagnatech Limited also owns credentials to access the Mercedes Benz official Digital Service Record. This allows us to update and record all maintenance work and repairs on each vehicle in line with the Mercedes Benz After Sales guidelines. Diagnatech Limited has also made considerable investments in Mercedes Benz special tooling which is imperative to carrying out repairs correctly and in accordance with dealer guidelines.

 Our Facilities

Diagnatech Limited has been renovating this new premises since early 2013, our state of the art workshop consists of a 3 bay workshop, including a complete 4 wheel laser tracking bay. We have a specified diagnostic bay and nominated ares for waiting jobs which require our immediate attention. We have a specific customer waiting area which provides comfy seating and allows our customers to relax and enjoy a nice espresso while maybe catching up on some daily TV. The building security is extremely impressive, consisting of security shutters. 24 hr police monitored alarm systems and CCTV. All vehicles left onsite during the day and evening are parked inside a secure 2.4m gated palisaded compound which is locked and covered by our High Definition CCTV Car park Cameras.

 Surrounding Area

Diagnatech Limited is situated on a very well known industrial estate in Welwyn Garden City. We have recently moved into this new premises and have transformed it into a state of the art Mercedes Specialist Workshop. The estate is in walking distance of the town centre and boasts very pleasant surrounding parks and shopping centres, including John Lewis, Marks and Spencer's and most importantly A Starbucks & Costa coffee house.


Director / Workshop Manager

James started his apprenticeship specialising in Mercedes Benz at the age of 15. He has been trained in house and has progressed to the position of Diagnostic Technician. James hard work and skills have allowed him to take the position of Workshop Manager at Diagnatech Limited.


Managing Director

Paul started his apprenticeship with London Lotus Sports Cars before moving to Mercedes Benz Of Chingford. He then moved to Mercedes Benz of Harpenden to finish his training. Not happy to settle at this, he then moved to HR Owen Sports cars as a Ferrari / Bentley Technician before returning to Mercedes Benz of Hitchin as a Diagnostic Technician / Manager. Paul Started Diagnatech in 2004 alongside his brother James and between them have built the business over a 10 year period.


Full Collection and Delivery service available. Free of charge. Complimentary valet on every service.


With Complimentary refreshments, we offer a comfortable waiting area with TV and Internet connection, where you can relax while waiting for your Mercedes Benz


In a hurry? We can have all paperwork ready when you drop off your vehicle to one of our team if pre-booked. Drop off is available from 6.30am


Exclusive to Diagnatech Limited. This service we offer to our customers if they need early or late night appointments. We can offer appointments up to 9pm Monday-Friday


Diagnatech Limited is registered with Mercedes Benz as an official Star Partner, which allows us to use their Genuine Parts catalogues and link directly to their UK warehouse for immediate stock levels and pricing.

For Everything Mercedes


Tel: 01707 527557

James Poltorak
Tel: 07789 955 889

Paul Poltorak
Tel: 07780 602 816