Johnny's Auto Service understands the importance of your On-Board Diagnostics. Give us a call or stop by for a complete diagnostic check up:

Check Engine Light
No one likes to see their truck's "Check Engine" light come on. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. At Johnny's Auto Service, we can pull the code and diagnose the problem for you. Give us a call at 301-577-3140 or stop by the shop for our expert assistance.

Computer Diagnostics
Modern vehicles are fitted with at least one onboard computer. The computer's main function is to monitor and adjust the engine and transmission. Computer testing and diagnostics is an integral aspect to professional electronic work on modern cars. Computer diagnostics help find the root causes of major and potential automobile problems. At Johnny's Auto Service, we have state of the art computer diagnostics equipment such as digital code readers, pressure test kits, circuit testers, digital tachometers and more. Call 301-577-3140 or visit our auto shop in Lanham, MD 20706 for all your vehicle's computer diagnostic needs.

Drivability
Drivability is the degree of smoothness and steadiness of your truck's acceleration. Most modern vehicles are fitted with on-board computers that continuously check the readings from various sensors. In case of drivability problems, you will receive a warning message on your truck's dashboard. To have your truck diagnosed for drivability issues, visit Johnny's Auto Service in Lanham, MD 20706 today. At Johnny's Auto Service, we have the necessary tools, training, and technology to diagnose and address your vehicle's drivability issues.

Engine Controls
Basically, an engine control system is an on-board computer in your truck. Like all computers, the engine controls are composed of hardware and software. Automotive engine control systems are responsible for regulating exhaust emissions, and providing increased fuel economy. To get the best out of your vehicle's incredibly powerful technology, make sure engine controls are working properly. To check if your truck's engine controls are working properly, call Johnny's Auto Service today.


Partners

ASE Master Technician
Enterprise
ASE (Automotive Service Excellence)
Repair Pal
Jasper
NAPA
AAA Approved Auto Repair
Carmax Trusted partner
Car Care Aware

What our clients are saying about us

We have established longterm and stable partnerships with various clients thanks to our excellence in solving their automotive needs!

Great job! I've taken my car to them before, and they always provide excellent service! They are always very pleasant and professional, and they do great work. Would highly recommend their service. 5 stars for sure! quotes-image
, 11/29/2022
I had taken my 2007 GMC Envoy Truck for some repair work that needed to be done. and Mr.John had taken the time and he was very knowledgeable and professional and I really like the professional service that I had received. They took care of my truck and they did a very good job in getting me back on the road. I am very happy and I will be definitely coming back to have both of my vehicles serviced here. I highly recommend this auto service shop to anyone that needs car /maintenance service.quotes-image
, 09/03/2020