PIWIS III Factory Diagnostics
Porsche Diagnostics & Check Engine Light in Stratford, CT
Generic OBD-II scanners read a fraction of the fault codes stored in a Porsche's 30+ control modules. Our PIWIS III — Porsche's factory diagnostic system — accesses every module, reads manufacturer-specific codes, views live data streams, performs guided fault finding, and programs module adaptations. It's the difference between guessing and knowing.
Gold Meister Certified · PIWIS Equipped · OEM Specifications
Why This Matters on a Porsche
A check engine light on a Porsche can mean anything from a loose gas cap to a failing catalytic converter. The critical difference is diagnosis. A generic OBD-II scanner might read "P0420 — Catalyst System Efficiency Below Threshold" and recommend a catalytic converter replacement. PIWIS III goes deeper — it shows us which bank, the O2 sensor waveforms, fuel trim data, and adaptation values that help us determine whether you actually need a $5,000 catalytic converter or a $200 O2 sensor. This depth of diagnosis saves owners thousands in unnecessary repairs.
Model-Specific Details
911 (997-992)
Common codes: misfires (coil packs), O2 sensors, VANOS/VarioCam issues. PIWIS guides us to the specific cylinder and bank.
Cayenne
Common codes: catalytic converter efficiency, transfer case faults, air suspension height sensor errors. Multi-system diagnosis.
Macan
Common codes: turbo wastegate, PCV valve, carbon buildup (4-cylinder). PIWIS adaptation reset after repair.
Panamera
Common codes: air suspension faults, misfire (V8 coil packs), PDCC system errors. Complex multi-module diagnosis.
Boxster/Cayman
Common codes: VarioCam solenoid, O2 sensor, secondary air injection. Simpler systems but still require PIWIS for full diagnosis.
Air-Cooled (964/993)
OBD-I diagnostics. Limited fault codes but PIWIS predecessor tools available. Most diagnosis is hands-on mechanical inspection.
What's Included
- PIWIS III full-system diagnostic scan (all modules)
- Check engine light diagnosis and repair
- ABS, airbag, and stability control fault diagnosis
- Transmission fault code diagnosis (PDK and manual)
- PASM, PDCC, and suspension system diagnostics
- Emission system diagnosis (catalytic converter, O2 sensors)
- Electrical fault tracing and intermittent issue diagnosis
- Pre-purchase diagnostic scan
Our Equipment
PIWIS III Factory Diagnostic System
The same diagnostic system used in every Porsche dealership worldwide. PIWIS III communicates with every control module in your Porsche — engine, transmission, ABS, airbag, PASM, PCM, BOSE, comfort access, and more. It reads Porsche-specific fault codes, accesses guided fault-finding procedures, and can program and adapt modules.
Oscilloscope & Electrical Testing
For electrical faults that don't store fault codes, we use oscilloscope testing to capture intermittent signals, wiring issues, and sensor waveforms. Combined with PIWIS data, this allows us to diagnose elusive issues that other shops can't find.
Dealer vs. Independent Specialist
Porsche dealer diagnostic time starts at $250-$400+ for the first hour. We charge competitive diagnostic rates with the same PIWIS III system and — often — more experience with your specific issue. Our Gold Meister technician has seen the common failure patterns across thousands of Porsche services and can often identify the root cause faster than a less-experienced dealer technician working through the guided fault tree.
More Than Just a Service Visit
Every diagnostic service includes a full-system PIWIS scan of all modules (not just the module with the warning light), a visual underbody inspection, and a test drive to verify reported symptoms. We provide a printed fault code report with plain-language explanations and a prioritized repair recommendation.
Why Choose Repasi Motorwerks
- PIWIS III — the factory tool, not a generic OBD-II scanner
- All 30+ control modules scanned — not just engine codes
- Gold Meister technician interprets fault codes with experience, not just a code reader
- Intermittent fault diagnosis with oscilloscope and data logging
- Honest assessment — we tell you what needs fixing now vs. what can wait
- Diagnostic fee applied toward repair if you proceed
Frequently Asked Questions
- What does PIWIS III do that a regular scanner can't?
- A generic OBD-II scanner reads standardized engine and transmission codes — roughly 10% of the data in a Porsche. PIWIS III accesses all 30+ control modules (ABS, airbag, PASM, PDK, BOSE, comfort access, etc.), reads Porsche-specific manufacturer codes, views live data streams, performs guided fault-finding procedures, and can program and adapt modules. It's the difference between a symptom and a diagnosis.
- How much does Porsche diagnostics cost?
- Our diagnostic service includes a full-system PIWIS III scan, fault code interpretation, visual inspection, and a prioritized repair recommendation. The diagnostic fee is applied toward the repair if you proceed with the work. This saves you from paying separately for diagnosis and repair.
- Can you diagnose intermittent Porsche problems?
- Yes. Intermittent faults are our specialty. We use PIWIS III fault memory (which stores codes even after they clear), oscilloscope testing for electrical intermittents, and data logging for drivability issues that only occur under specific conditions. Some intermittent issues require leaving diagnostic equipment connected during a test drive.
- Should I get a diagnostic scan before buying a used Porsche?
- Absolutely. A pre-purchase PIWIS scan reveals stored and pending fault codes, service history reset dates, mileage discrepancies between modules, and adaptation values that indicate wear or modification. It's one of the most valuable tools in a pre-purchase inspection. We offer this as part of our comprehensive PPI service.
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