Check engine light Melbourne.
Diagnose first. Fix once. Fix properly.

A basic OBD-II scanner reads generic engine-ECU fault codes and shows you a string of letters and numbers. That's about 10% of the useful diagnostic surface on a modern European car. The other 90% lives in dealer-level tools: manufacturer-specific fault codes, live-data streams from every module, coding data, adaptation values, and firmware history.

ISTA (BMW), ODIS (VW/Audi), Xentry (Mercedes) and PIWIS (Porsche) are the actual diagnostic platforms. They talk to every module on the car — engine, transmission, ABS, airbag, HVAC, infotainment, comfort, gateway — and read data the generic OBD spec doesn't expose. A proper diagnostic is expensive because the tools are expensive and the training is real.

1. Full multi-module scan. Every module, stored + pending faults, freeze-frame data (what the car was doing when the fault occurred), mileage stamp on each fault. This alone tells us whether we're looking at a recent problem, an intermittent one, or a long-standing chronic issue.

2. Live-data logging under operating conditions. Trims, timing, injector pulse widths, MAF, MAP, boost, cam correlation, O2 sensors — logged while the car is doing what triggers the fault. Not idle. Not on a lift. On the road, under load, in the exact conditions where the problem shows up.

3. Component testing. Where a fault could be one of several parts, we test each individually. Injector balance test on a misfire, coil pack pattern analysis, HPFP pressure test — real diagnostic work, not part-swapping.

4. Written diagnosis + quote. You get a plain-English report of what's actually wrong, photographed where relevant, with a written, line-itemised quote for the fix. You approve in writing before we touch anything.

5. Repair, verification, road test. Fault is repaired, live data verified in the operating window, faults cleared, road test to confirm no recurrence. Only then is the job closed.