ECU tuning and your warranty, insurance and APK.

Plenty gets written about power gains, not much about the consequences. Yet this is the part you can end up regretting afterward. Below are the three things you need to know before you have software written to your car.

Factory warranty

A manufacturer doesn't have to cover damage caused by a modification. That doesn't mean your entire warranty is void automatically: if your wiper motor fails, that has nothing to do with your engine software. But if your turbo, clutch or gearbox fails, the importer will check whether the car was tuned. Modern ECUs log that they've been written to, and that's readable. So assume it will be seen.

If you drive a car still under factory warranty or a lease contract, factor that in. You can revert software to original in many cases, but the write counter stays.

Insurance

This is the point most people underestimate. In the Netherlands you're required to report modifications to your vehicle to your insurer, and a power increase falls under that. If you don't, an insurer can limit or refuse coverage in the event of a claim, because you're insured for a different risk than the one you're actually driving.

The reality is less scary than it sounds: many insurers accept an increase up to a certain percentage, sometimes for a small premium surcharge. It costs you one phone call or email. That's considerably cheaper than a rejected claim.

If the tuning increases power enough to put the car in a different category, that can also change the road tax or the required driving licence category for heavier vehicles. Ask about it.

APK and emissions

A Stage 1 tune on a healthy engine that leaves all emissions equipment intact is generally not a problem at the APK (the Dutch periodic roadworthiness inspection): the particulate filter, catalytic converter and sensors just do their job.

It's a different story when emissions equipment is disabled or removed. Since 2022 the APK for diesel vehicles includes a particle count measurement, which reliably detects a removed or non-functioning particulate filter. Disabling EGR or AdBlue also means a vehicle no longer meets the requirements for public roads in the Netherlands and the rest of the EU.

That's why we only offer that kind of modification for export and for use on closed terrain. We're upfront about that on the product, and not just for show: if you drive on public roads with it, that's your responsibility, and you run a real risk of a failed APK and a fine.

Quick summary

• Report it to your insurer. Always. It costs almost nothing and covers the biggest risk.
• Keep the factory warranty in mind for as long as it runs.
• A clean Stage 1 with intact emissions equipment is not a problem for the APK.
• Disabling emissions equipment is for export or closed terrain, not for public roads.

Not sure what's wise in your situation? Call us. Otherwise, check out the ECU tuning range or read what Stage 1 actually is.