Pre-Tuning Checklist

Service History and Maintenance

Confirm that engine oil, coolant, and spark plugs (petrol) or glow plugs (diesel) are within their service intervals. Running a tune on degraded consumables introduces unnecessary variables and can mask underlying issues. Fresh fluids and ignition components give the calibration the cleanest possible baseline.

Diagnostic Scan

Run a full OBD-II scan and, if possible, a BMW-specific scan using ISTA or a compatible tool. Clear any historical faults and then drive the vehicle to confirm no new codes appear. Active fault codes — especially boost, fuel-pressure, or misfire faults — must be resolved before a calibration file is written.

Hardware Inspection

Inspect charge pipes, intercooler hoses, and vacuum lines for cracks or loose clamps. Check the intake filter for contamination and ensure the mass-airflow sensor is clean. On higher-mileage vehicles, a boost-leak test is highly recommended — even a small leak can skew airflow calculations and reduce the effectiveness of a tune.

Document Your Setup

When you submit a file request, include the vehicle VIN, current mileage, fuel grade you run, and a list of any aftermarket hardware. The more context our engineers have, the more precisely they can tailor the calibration. Photos of modifications and a short datalog at wide-open throttle are always welcome.

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