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Johnny's AutomotiveJohnny's Automotive
Haines City, FL

Computer Diagnostics at our Haines City shop

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

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Haines City, FL31600 U.S. 27Book a time online
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Where to find our Haines City shop

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

Address

31600 U.S. 27
Haines City, FL 33844

Shop phone

(863) 422-2995

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 Haines City

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.

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Pre-Purchase Inspection

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

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Vehicle Inspection

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

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No Start Diagnosis

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

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Electrical Diagnosis

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

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Charging System Diagnosis

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

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Overheating Diagnosis

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

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Brake Noise Diagnosis

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

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Suspension Noise Diagnosis

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

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Steering Problem Diagnosis

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

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AC Diagnosis

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

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Vibration Diagnosis

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

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Fluid Leak Diagnosis

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

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Recent Computer Diagnostics Work in Haines City

Real jobs completed by our team in the Haines City area

Our team

Our Team

September 2026

What Caused the Clunking Noise Over Bumps?

The Problem

The vehicle owner reported a clunking noise coming from the front end of the vehicle when going over bumps.

What We Found

The technician found that the stabilizer bar links were worn and needed replacement, contributing to the noise.

The Fix

The team replaced the stabilizer bar link kit and also installed two new front tires with an alignment. Additionally, the suspension shock or strut assembly was removed and replaced to ensure optimal performance.

The Result

The clunking noise was eliminated, and the vehicle's handling was significantly improved.

Pro Tip

If you hear a clunking noise when driving over bumps, it often indicates worn stabilizer bar links. Addressing this early can prevent further suspension damage and maintain smooth handling.

Our team

Our Team

September 2026

Why Does My Car Stall When I Turn On the AC?

The Problem

The vehicle would shut off multiple times when the air conditioning was turned on, especially when parked. Additionally, the AC sometimes blew warm air.

What We Found

The technician discovered that the air conditioning system had no refrigerant, which could cause the compressor to overwork and lead to the vehicle stalling.

The Fix

The team evacuated the AC system to remove contaminants, verified the system pressures, and recharged it with the proper refrigerant and oil capacity. They also added a UV dye for future leak detection if the issue reoccurred.

The Result

After the service, the vehicle's AC functioned correctly without causing the engine to stall.

Pro Tip

If your AC blows warm air or causes the engine to stall, it might be due to low refrigerant levels. Regular AC system checks can prevent these issues and keep your vehicle running smoothly.

Our team

Our Team

September 2026

What Caused the Persistent Oil Leak?

The Problem

The vehicle owner noticed that their vehicle was leaking oil.

The Fix

The technician at our Haines City shop removed and replaced the valve cover gasket on both sides of the engine. This repair was part of a comprehensive service package that also included mounting and installing two new tires with alignment and an oil change using full synthetic oil.

The Result

After the repairs, the vehicle's oil leak was resolved, and it was back to optimal performance.

Pro Tip

Oil leaks often occur due to worn gaskets. Replacing a valve cover gasket early can prevent more severe engine damage and costly repairs.

Our team

Our Team

September 2026

Why Is My Oil Level Overfull and Leaking?

The Problem

The vehicle owner noticed a significant oil leak and overfull oil dipstick after the car started smoking during their drive home.

What We Found

The technician identified that the oil pan gasket was failing, leading to the oil leak.

The Fix

The team at our Haines City shop replaced the faulty oil pan gasket and performed a full synthetic oil change to vehicle specifications. Additionally, they removed and replaced the engine front cover to ensure a secure seal.

The Result

After the repairs, the oil leak was resolved, and the vehicle ran smoothly without any further smoking issues.

Pro Tip

Oil leaks can often be traced back to a failing gasket. If you notice oil spots where you park, have your vehicle inspected promptly to avoid engine damage and higher repair costs.

FAQ

Computer Diagnostics in Haines City: questions answered

Answered by our licensed technicians serving Haines City.

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.

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Flexible Drop-Off Hours

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20+ Years

Decades of trusted service

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