Advanced
Diagnostics.
Real Answers.

Mobile automotive diagnostic service for complex, electrical, and hard-to-find problems in the Austin–Waco I-35 corridor.

Request a Diagnostic → Mobile diagnostics starting at $149.
Tell us your vehicle, location and symptoms. We’ll confirm pricing and whether the job is a good fit before we come out.
✓Find the actual cause
Not just the code
⚙Advanced diagnostic tools
and real-world experience
●Mobile service
at your location

Our Diagnostic Services

Complex problems. Multiple systems. Real diagnostic expertise.

No-start diagnostics

No-Start
Diagnostics

No crank, crank no start, intermittent starting issues

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Check engine diagnostics

Check Engine
Diagnostics

Warning lights, drivability issues, and more

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Electrical diagnostics

Electrical
Diagnostics

Wiring, modules, communication and complex electrical faults

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VW and Audi diagnostics

VW & Audi
Diagnostics

Factory-level diagnostic capabilities for Volkswagen and Audi vehicles

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Ford diagnostics

Ford
Diagnostics

Advanced diagnostics for modern Ford vehicles

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BMW and MINI diagnostics

BMW
Diagnostics

Deep-level diagnostics for supported BMW-family vehicles, including BMW, MINI and other BMW Group platforms — module scans, live data, adaptations, electrical fault tracing and advanced testing where supported.

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Toyota and Lexus diagnostics

Toyota / Lexus
Diagnostics

Deep-level diagnostics for supported Toyota-family vehicles, including Toyota and Lexus — module scans, live data, bidirectional testing, electrical diagnostics and system-level troubleshooting where supported.

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Second opinions

Second Opinions

Get an expert diagnostic opinion before an expensive repair

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Pre-purchase inspection

Pre-Purchase
Inspection

Reduce risk before you buy. A pre-purchase inspection can help uncover existing problems, save money, and minimize the chance of ending up with a bad vehicle purchase.

Request an Inspection →
Deep-level manufacturer diagnostics available. BMW, MINI, Toyota, Lexus, Volkswagen, Audi, Ford and other supported vehicles may have access to enhanced module-level diagnostics beyond a basic code scan. Coverage varies by year, model and system, so fill out the diagnostic request form and we’ll confirm whether we can support your specific vehicle and issue.
Repairs may be available after diagnosis. Once the cause is identified, we’ll explain the recommended next step. In some cases, we may also be able to perform the repair or service, depending on the vehicle, type of work and availability.

Why Choose
Precision Auto Diagnosis?

  • Experienced, diagnostic-focused approach
  • Advanced scan tools and testing equipment
  • Mobile service at your location
  • Specialized experience with complex and intermittent problems
  • Honest assessments and clear communication
Automotive diagnostic testing

Recent Case Studies

Real diagnostic work. Real solutions.

2014 Mercedes C250

2014 Mercedes C250
No-Crank / Failed Starter

Rain, moisture and changing fuse-box symptoms complicated diagnosis; downstream testing confirmed the starter.

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2012 Volkswagen Passat

2012 VW Passat
Seized Ignition / Broken Key

Metal shavings caused the lock cylinder to bind. Repaired with $0 replacement parts, avoiding roughly a $2,000 replacement/programming path.

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2014 Ford Focus

2014 Ford Focus
Intermittent EPAS / Steering Loss

Battery sensitivity and a previously replaced steering unit complicated diagnosis; the actual recurring fault was a high-resistance ground.

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Volkswagen Atlas

Volkswagen Atlas
Multiple Warnings / Software Fault

Scan data verified the engine was running normally and not overheating. A dealer software update ultimately corrected the condition.

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Ford Focus camshaft sensor wiring case

Ford Focus
Camshaft DTC / PCM Wiring

The cam sensor tested good. Multiple wiring breaks between the sensor circuit and PCM were found and repaired with a new wire run.

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Mercedes repeated belt failure case

Mercedes
Repeated Belt Failure

A replacement belt failed again almost immediately. Diagnosis found a seized idler pulley; the repair was about $50 total and remained reliable for months.

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Mercedes startup misfire case

Mercedes
Intermittent Startup Misfire

Coil swapping and testing narrowed the startup misfire to an ignition-coil issue. A better-sealed OEM-style coil resolved it.

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VW Passat air conditioning diagnosis

2012 VW Passat
A/C Not Cooling

Loss of cooling was traced to the compressor control solenoid. Cooling restored for under $100 without replacing the compressor.

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VW Passat heated seat diagnosis

2012 VW Passat
Heated Seat Failure

An intermittent seat-heater failure was traced to a loose connector and corrected with no parts or seat teardown.

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2005 Hummer H2 water intrusion diagnosis

2005 Hummer H2
Water Intrusion

Common leak points have been tested and ruled out; remaining work is focused on the cowl/HVAC intake area and driver-side door seal.

View Progress →
VW Passat fuel gauge sender diagnosis

2012 VW Passat
Fuel Gauge / Sender

Gauge response and sender readings suggest restricted float travel or installation geometry; final confirmation is pending.

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SERVICE AREA & PRICING

Serving the Austin–Waco I-35 Corridor

$149 Starting Mobile Diagnostic Professional on-site troubleshooting for supported vehicles and problems.
Confirmed Before Dispatch Final pricing is confirmed based on the vehicle, location, symptoms and expected diagnostic complexity.
Waco
Temple
Georgetown
Austin
●
Outside our normal
service area?

Contact us for a quote
based on location.