Skip to content
New customers get 10% off labor on your first service. Call or text 678-386-1390.
Chastain Mechanical Solutions logo: a fist holding a wrench Chastain Mechanical Solutions Reliable work at affordable prices!

Home Services Mobile Diagnostics

Diagnostics · We come to you

Mobile Car Diagnostics in Stockbridge & Metro Atlanta

Check engine light on, or a car that’s acting up and you don’t know why? We come to your driveway and find the cause, so you don’t spend money on the wrong repair.

4.3 stars from 60 Google reviews · Available 24/7

OBD2 scan tool plugged in under a dashboard, showing check engine code P0420
Reading the code is step one. Finding the cause is the job.

Symptoms

Signs your vehicle needs a diagnostic

If any of these sound familiar, call or text us and describe what the vehicle is doing.

Check engine light is on

The computer has logged a fault and wants it looked at.

Rough idle, stalling, or hesitation

The engine shakes, cuts out, or stumbles when you press the gas.

Won’t start, or only starts sometimes

Could be the battery, the starter, the alternator, or something else entirely.

Other warning lights on the dash

Battery, ABS, temperature, or any light that wasn’t on yesterday.

Electrical problems

A battery that keeps dying, or lights and windows that act up.

You’re about to buy a used car

Have it inspected before you hand over the money.

Check engine light flashing? Pull over when it’s safe and call us. Driving on it can turn a small repair into a big one.

What we do on-site

Diagnostics we handle where the vehicle sits

01

Check engine light diagnosis

We read the codes, then test to find the actual cause behind them.

02

Electrical diagnosis

Dead batteries, lights, and other electrical issues traced to the source.

03

No-start diagnosis

We check the battery, starter, alternator, and ignition to find out why it won’t crank.

04

Pre-purchase inspection

Before you buy a used car, we check it over and tell you what we find.

Also on-site

Motor mount replacement

We replace motor mounts where the vehicle is parked. Every motor mount job starts with a diagnostic, and your estimate comes after that.

Mechanic's hand holding a wiring connector on an engine with the intake removed

Real job · Stockbridge, GA

A knock sensor wiring fault, found and repaired on-site

On this job in Stockbridge, the fault turned out to be the knock sensor wiring. A code reader can point to a circuit, but it can’t tell you whether the part or the wiring has failed. We tracked it down and made the repair right there, with no tow and no shop visit.

What to expect

$95 to find the problem, and half goes toward the fix

Call or text with your year, make, and model and what the vehicle is doing. We come to you, track down the cause, and explain what we found in plain English. If you want it fixed, you get the price before any work begins.

Where

Your driveway, your office lot, the roadside, or wherever the car you’re buying is parked

Typical time

About an hour

Diagnostic fee

$95, due when the diagnosis is done

Same-day repair

Half of the fee is credited toward the repair when we do it the same day

Pre-purchase inspection

$150

4.3 stars · 60 Google reviews

“Great service begins with the initial phone call. Erica was extremely patient and professional. She connected me with their mobile mechanic who was as knowlegeable and helpful as anyone could hope for. I will definitely be recommending this service to all of my friends and family!”

Joan Merriweather · 5-star Google review · Auto engine diagnostic

FAQ

Mobile diagnostic questions

How much does a mobile car diagnostic cost?

The diagnostic fee is $95. It covers the time, tools, and expertise it takes to find the problem, and it’s due when the diagnosis is done. If we do the repair the same day, half of the fee is credited toward the cost of the repair.

The parts store read my code for free. Why pay for a diagnostic?

A code tells you which system reported a problem, not which part failed. We test to find the actual cause, so you don’t pay for parts you didn’t need. If you’d rather we do a repair based on someone else’s diagnosis, we can, but we can’t guarantee it will fix the problem.

Is it safe to drive with the check engine light on?

If the light is steady and the vehicle drives normally, it’s usually fine for a short time, but get it checked soon. If the light is flashing, or the vehicle is shaking, overheating, or losing power, pull over when it’s safe and call us.

Do you inspect a used car where the seller has it?

Yes. We come to wherever the vehicle is parked and check it over before you hand over any money. A pre-purchase inspection is $150.

Other services we bring to you

Starting System Repair

Batteries, starters, alternators, and ignition problems fixed on-site.

Starter and alternator repair →

Brakes & Suspension

Pads, rotors, shocks, and struts replaced in your driveway.

Mobile brake repair →

Cooling System Repair

Radiator, water pump, and hose repair with accurate leak diagnosis.

Cooling system repair →

While we’re there: add an oil change or a fluid check to any repair visit.

Mobile diagnostics are available in Stockbridge, McDonough, Decatur, Atlanta, and across Henry, Clayton, Fulton, DeKalb, and Rockdale Counties.

New customers only

Check engine light on? Get 10% off labor on your first service.

Mention this offer when you call or text to book.

Call 678-386-1390 Text us