Skip to main content
Johnny's AutomotiveJohnny's Automotive
Winter Haven, FL

Computer Diagnostics at our Winter Haven shop

Bring it to our Winter Haven shop and we'll handle the computer diagnostics. Here's where to find us, when we're open, and how to book a time.

Call Now
Winter Haven, FL5100 Dundee RoadBook a time online
Step 1 of 2

How can we help?

Tap the closest match.

When works best? (optional)

Visit us

Where to find our Winter Haven shop

Address, hours, and directions for the shop that handles your computer diagnostics.

Address

5100 Dundee Road
Winter Haven, FL 33884

Shop phone

(863) 949-2995

Hours

Monday
7:30 AM to 5:30 PM
Tuesday
7:30 AM to 5:30 PM
Wednesday
7:30 AM to 5:30 PM
Thursday
7:30 AM to 5:30 PM
Friday
7:30 AM to 5:30 PM
Saturday
Closed
Sunday
Closed
Options

Computer Diagnostics options in Winter Haven

Choose the right computer diagnostics service for your needs.

Check Engine Light

Check engine light on? We pinpoint the exact cause with advanced diagnostics and provide clear repair options — no guesswork.

Learn more

Pre-Purchase Inspection

Buying a used car? Our thorough multi-point inspection uncovers hidden problems so you can buy with confidence.

Learn more

Vehicle Inspection

Vehicle Inspection evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

No Start Diagnosis

No Start Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Electrical Diagnosis

Electrical Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Charging System Diagnosis

Charging System Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Overheating Diagnosis

Overheating Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Brake Noise Diagnosis

Brake Noise Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Suspension Noise Diagnosis

Suspension Noise Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Steering Problem Diagnosis

Steering Problem Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

AC Diagnosis

AC Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Vibration Diagnosis

Vibration Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Fluid Leak Diagnosis

Fluid Leak Diagnosis evaluates relevant vehicle systems and documents findings for repair planning.

Learn more

Recent Computer Diagnostics Work in Winter Haven

Real jobs completed by our team in the Winter Haven area

Our team

Our Team

September 2026

Why Is My AC Blowing Hot Air?

The Problem

The vehicle's air conditioning was not working, causing discomfort during drives.

What We Found

The technician found that the AC system was completely devoid of refrigerant, which is essential for cooling.

The Fix

The team at our Winter Haven shop performed an AC service, which included connecting AC equipment, evacuating contaminants, and recharging the system with the proper amount of refrigerant and oil. They also added a UV dye to help detect any potential leaks in the future.

The Result

The AC system was restored to proper functionality, providing cool air once again.

Pro Tip

If your AC starts blowing warm air again, it might indicate a leak. Returning for a UV dye inspection can pinpoint the issue before it worsens.

Our team

Our Team

September 2026

What Caused the Check Engine Light and Red Lightning Bolt?

The Problem

The vehicle owner reported that the Check Engine Light (CEL) remained on, and the red lightning bolt and traction control lights appeared about a week ago, were reset, and then returned.

What We Found

The technician conducted an initial assessment and determined that further testing was necessary to fully understand the issue.

The Fix

The team at our Winter Haven shop removed and replaced the throttle body assembly, performed a relearn of the throttle body, and reset the computer system. Additionally, they replaced the oil pan or gasket and the valve cover gasket to ensure the vehicle's systems were functioning properly.

The Result

After the repairs, the vehicle's warning lights were cleared, and it was running smoothly without further issues.

Pro Tip

If your vehicle's check engine light is accompanied by a red lightning bolt, it often indicates a throttle control issue. Addressing it promptly can prevent further complications and maintain your vehicle's performance.

Our team

Our Team

August 2026

Why Is My Car's AC Blowing Warm Air?

The Problem

The vehicle owner experienced warm air blowing from the car's air conditioning system.

What We Found

The technician found that the AC system had 0.00 lbs of refrigerant, indicating a complete lack of freon.

The Fix

The team evacuated and recharged the R134A air conditioning system, ensuring the correct refrigerant and oil levels were restored. They performed a leak test and added a UV dye to help identify any potential leaks in the future.

The Result

The AC system was restored to proper function, providing cool air once again.

Pro Tip

If your AC starts blowing warm air again, return to the shop quickly. The added UV dye helps locate leaks easily, preventing more expensive repairs later.

Our team

Our Team

August 2026

What Caused the Persistent Oil Leak?

The Problem

The vehicle owner noticed an ongoing oil leak, leaving spots on their driveway.

What We Found

The technician found that the valve cover gasket and oil pan gasket were both compromised, leading to the oil leak.

The Fix

The team at our Winter Haven shop removed and replaced both the valve cover gasket and the oil pan gasket. They also performed a full synthetic oil change to meet the vehicle's specifications.

The Result

The vehicle was returned to the owner with no further signs of an oil leak.

Pro Tip

Oil leaks can often be traced to worn gaskets. Replacing them promptly prevents further engine damage and avoids costly repairs down the line.

FAQ

Computer Diagnostics in Winter Haven: questions answered

Answered by our licensed technicians serving Winter Haven.

Why do you charge for diagnosis when the parts store reads codes for free?

Because they're two different things. Reading a code takes a few seconds and tells you which system reported a fault. Finding the cause takes a technician, a lift, live data, and testing to prove which part in that system actually failed. That's the work you're paying for, and it's the part that keeps you from buying components that don't fix the car. Bring us the code you already have. It gives us a head start.

Does the diagnostic fee go toward the repair if I have you do the work?

That depends on the job, and the service advisor will lay it out at the counter before anything starts, so there are no surprises on the invoice. The bigger point is what the fee gets you either way: a confirmed cause with photos, and a quote based on the actual problem instead of a guess. Ask us when you drop the car off and we'll tell you exactly how it works for your repair.

How long does diagnosis take?

It depends on the symptom. Something that's failing right now in front of the technician can be pinned down quickly. An intermittent problem, a wiring fault, or a noise that only shows up cold takes longer, because we have to recreate the condition before we can test anything. We'll give you a time estimate up front and call you if what we find changes it. We'd rather tell you it's going to take a while than hand you a fast answer that's wrong.

What if you can't find the problem?

We'll tell you that plainly instead of picking a part and hoping. Usually it means the fault is intermittent and hasn't shown itself yet, and the next step is either leaving the car with us longer or bringing it back when the symptom is happening. You'll get everything we ruled out and how we ruled it out, which is real information even when it isn't the answer you wanted. If a job is beyond what we can test here, we'll say so rather than run up your bill.

Can you diagnose something another shop already worked on?

Yes, and we get that call a lot. We start from the car in front of us rather than from what's already been replaced, because assuming an earlier repair was right is how the same wrong answer gets repeated. Bring your paperwork if you have it. Knowing what's already been done and what changed afterward is genuinely useful. You'll get the same thing anyone else gets: a named cause, photos, and a quote, and no pressure about where you have the work done.

Request an Appointment

Step 1 of 2

How can we help?

Tap the closest match.

When works best? (optional)

ASE Certified Technicians

ASE certified techs working on your vehicle

Flexible Drop-Off Hours

Convenient service options

20+ Years

Decades of trusted service

Schedule now