Auto & Diesel Diagnostic Services in Avon, IN
A dashboard light or a strange noise can mean a dozen different things. We run a real diagnostic on every vehicle — pulling codes, testing components, and confirming the actual cause — before we ever recommend a repair.
Why We Diagnose Before We Repair
A code or a warning light tells you where a problem was detected, not necessarily what caused it. A check engine light for a misfire, for example, could be a coil, a spark plug, a fuel injector, a vacuum leak, or a dozen other things depending on the code and the data behind it. Replacing parts based on a guess is how customers end up paying for parts that were never the problem.
That's why every diagnostic we run starts with pulling the actual data — codes, live sensor readings, and a real test of the components involved — so the repair we recommend is based on what's actually wrong, not what's most common.
What We Diagnose
Check Engine Light & Engine Diagnostics
A check engine light can point to anything from a loose gas cap to a serious engine or emissions fault. We read the codes, check live data, and test the specific system involved rather than just clearing the light. Starting at $165
Electrical Diagnostics
Intermittent electrical issues — a window that won't work, random warning lights, a phantom battery drain — are usually a wiring, relay, or sensor issue rather than a single failed part. We trace circuits and test components individually to isolate the actual fault. Starting at $165
No-Start Diagnostics
A vehicle that won't start could be a battery, starter, fuel delivery, or ignition problem — and each points to a different repair. We test each system in order so you get an accurate answer instead of a guess. Starting at $165
ABS & Traction Control Light Diagnostics
These lights usually point to a wheel speed sensor, a wiring issue, or a fault in the ABS module — all of which affect your braking and stability systems. We scan the safety modules and test wheel sensors to find the specific cause. Starting at $165
Airbag / SRS Light Diagnostics
An airbag or SRS light means a sensor or module in your safety restraint system has flagged a fault. We pinpoint which sensor or connection is triggering it so the system is restored to full working order. Starting at $165
Overheating & Cooling System Diagnostics
Overheating can come from low coolant, a bad thermostat, a failing water pump, a clogged radiator, or a head gasket issue — some of which are simple fixes and some of which are serious. We pressure-test and inspect the full cooling system to tell the difference before it causes engine damage. Starting at $165
Noise & Vibration Diagnostics
Clunks, squeaks, and vibrations can come from suspension, driveline, wheel bearings, or engine mounts, and they often only show up at certain speeds or conditions. We road test and inspect underneath the vehicle to track the noise to its actual source. Starting at $165
Battery, Starting & Charging Diagnostics
A weak battery, a failing alternator, and a bad starter can all cause similar symptoms. We test all three so you're not replacing a battery when the real problem is the alternator not charging it properly. Starting at $165
Heating System Diagnostics
No heat, or heat that comes and goes, is usually a heater core, blend door, blower motor, or low coolant issue. We check coolant flow and the components involved to find out which. Starting at $165
Oil & Fluid Leak Diagnostics
A leak's location on the ground doesn't always match its actual source once it's traveled along the underside of the vehicle. We clean the engine bay and, when needed, use UV dye to trace a leak back to where it's actually coming from. Starting at $165
General & Other Vehicle Concerns
Have something else going on that doesn't fit neatly into a category above? We'll listen to what you're noticing, road test the vehicle, and inspect it to get you an accurate diagnosis. Starting at $165
Diagnostic Services FAQ
Does the diagnostic fee go toward the repair if I have it done here?
Ask us when you schedule — we're happy to walk through how the diagnostic fee applies before you commit to a repair.
Can you diagnose an intermittent problem that isn't happening right now?
Often, yes. Stored codes and freeze-frame data can capture what was happening the moment a fault occurred, even if the symptom isn't present during the visit. Tell us as much detail as you can about when it happens.
Do you diagnose diesel trucks too?
Yes, on diesel trucks of every make. See our diesel repair page for more.
What if the diagnostic doesn't find anything wrong?
We'll tell you exactly that. An honest "we tested X, Y, and Z and they're within spec" is a real answer, not a reason to replace parts that don't need it.