Accelerate Auto Repair

Diagnostics In Rowlett, TX

The key to properly repairing a vehicle, regardless of age, is proper diagnostics. An auto technician cannot properly diagnose a vehicle without the appropriate diagnostic equipment. Accelerate Auto Repair has diagnostic tools for all vehicles, including BMW and Mercedes. You won’t have to take your vehicle to the dealership because we have the computers and other diagnostic equipment to assist our technicians in determining what is wrong. The ASE Certified auto technicians at Accelerate Auto Repair have experience in diagnosing all models of vehicles, and are adept at using the diagnostic equipment for all models.


Unlike parts such as brakes and suspension parts, or belts and hoses, you can’t look at a sensor or a computer and tell whether it’s broken. These electronic parts require scan tools to read live data and perform component activations as part of the diagnostic process.

A vehicle has two types of sensors.  The first senses what the vehicle is doing and forwards that information to the computer to determine air to fuel mixture and other functions. The second senses what has already happened and sends a signal to the computer to make adjustments.

For example, a manifold absolute pressure (MAP) sensor measures the pressure in the manifold. The computer then uses this information to determine how much air is proper for the correct air to fuel mixture.

An oxygen sensor senses the amount of oxygen in the exhaust and lets the computer know that there is too much oxygen (running rich) or too little oxygen (running lean) in the exhaust. The computer uses this information to make adjustments.

In many cases, what is happening sends a code for a malfunctioning oxygen sensor; however, it’s not that the oxygen sensor is not working properly – it’s that the readings are incorrect. The diagnostician must then determine what is causing the incorrect amount of oxygen in the exhaust. It could range from another sensor malfunctioning to something as simple as a plug or a coil not working properly.

Diagnostics machine sitting under the hood of a car


The vehicle’s diagnostic system sends a code to the computer and turns the engine light on to alert the driver when the vehicle has a problem. However, when the computer goes bad, things aren’t that easy to solve..

Since the computer can’t diagnose itself, it’s up to the technician to figure it out. The mechanic will look for signs such as diagnostic codes that are not related or simply don’t make sense. For example, if the coolant temperature sensor is throwing a code, yet the vehicle is not overheating, this is a tip that the computer might be bad. It could also be a problem with the wiring harness. The auto technician will look for other clues that tell him the computer is not working properly. Other signs include:

Let Accelerate Auto Repair Diagnose Your Vehicle

If your check engine light or any other malfunction indicator lamp is on, or if your vehicle is not running correctly, contact Accelerate Auto Repair at (469) 501-5115 for an appointment to diagnose your vehicle and repair the problem.

Make your appointment: