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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) 375-7602

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

August 2026

Why Is My Car in Limp Mode with Check Engine Light?

The Problem

The vehicle owner reported that the engine light came on and their car went into limp mode.

What We Found

The technician found error codes P1237, P2110, and P0643, indicating issues with the throttle body and accelerator pedal position sensor.

The Fix

The team at our Haines City shop removed and replaced the faulty throttle body and accelerator pedal position sensor. They also performed a software update to ensure all vehicle modules were functioning correctly.

The Result

After the repairs, the vehicle operated normally, and the check engine light was no longer illuminated.

Pro Tip

If your car enters limp mode, it's often due to a throttle body issue. Addressing it promptly can prevent further engine damage and costly repairs.

Our team

Our Team

August 2026

Why Is My Check Engine Light Flashing?

The Problem

The vehicle owner reported that the check engine light was on and flashing, and the car was going into limp mode.

What We Found

The technician determined that the issue was related to the throttle body assembly.

The Fix

The team performed a tune-up for the four-cylinder engine, which included the removal and replacement of the throttle body assembly. This service also involved a basic inspection of related components and system functions.

The Result

After the service, the vehicle's performance was restored, and the check engine light issue was resolved.

Pro Tip

A flashing check engine light often indicates a serious issue with the engine's performance. Addressing it promptly can prevent more costly repairs down the line.

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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ASE Certified Technicians

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Flexible Drop-Off Hours

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20+ Years

Decades of trusted service