Does A Remap Affect Your Insurance, Warranty Or MOT?

Two of the most common questions we get: will a remap affect my insurance, and will it affect my warranty? Here’s the straight answer, plus the MOT and lease questions that usually come next.

Insurance: you must declare it

A remap is a modification, and insurers ask about modifications when you take out or renew a policy. Leaving it out counts as giving them wrong information, which can mean a claim being reduced or refused, or the policy being cancelled. Telling them is usually a quick phone call or an online update.

What it does to your premium depends on the insurer. Some charge little or nothing extra, some charge more, and a few won’t cover modified cars at all, in which case a specialist modified-car insurer is the answer. When you call, describe it accurately (for example “Stage 1 ECU remap” and, if done, “gearbox software”) and keep our invoice and dyno printout as a record of what was done.

Warranty: it depends on the manufacturer

If your car is still under manufacturer warranty, the manufacturer can refuse claims on parts it says were affected by the remap, typically the engine, turbo, gearbox and clutch. Faults with no link to the engine or gearbox are a different matter, but the decision is theirs, and terms vary between makes.

Be aware that putting the original software back doesn’t necessarily hide a remap: modern ECUs can record that they’ve been reprogrammed. If your car is in warranty, talk to us before you book and weigh it up honestly. Many owners simply wait until the warranty ends.

Third-party and extended warranties have their own rules, and many exclude modified cars, so read the terms or ask the provider.

MOT: what matters is emissions

A remap on its own won’t fail an MOT. The car still has to pass the emissions test, and a properly developed map keeps it running cleanly. Removing emissions equipment such as the DPF or catalytic converter is different: that will fail an MOT, and it’s why our DPF, EGR and AdBlue work is for off-road and export use only.

Lease and finance cars

On a lease or finance agreement the car belongs to the finance company until it’s paid off, and most agreements need their permission for modifications. Check yours first. Because we keep your original file, a remap can be reversed before the car goes back or is sold.

Why reversibility matters

We save your stock file before we change anything, so your BMW or VAG can be returned to factory software at any time, whether that’s for selling the car, handing back a lease, or just changing your mind. Read more in is remapping safe?

Insurance and warranty FAQs

Do I have to tell my insurer about a remap?

Yes. A remap is a modification, and an undeclared one can lead to a claim being reduced or refused.

Will a remap put my insurance up?

It depends on the insurer. Some charge little or nothing extra, some charge more, and specialist modified-car insurers cover remapped cars routinely.

Will a remap void my warranty?

It depends on the manufacturer’s terms. Most can refuse claims on parts they link to the remap, such as the engine, turbo or gearbox. If your car is in warranty, talk to us before you book.

Can a dealer tell if my car has been remapped?

Often, yes. Even after the original software is put back, modern ECUs can record that they’ve been reprogrammed.

Will a remap affect my MOT?

Not on its own, as long as the car passes the emissions test. Removing emissions equipment such as a DPF will fail an MOT.

Can I remap a lease car?

Only with the finance company’s permission, as most agreements require it. Because we keep your original file, the remap can be reversed before the car goes back.

Got a specific question about your car and cover? Get in touch and we’ll give you honest advice before you commit.