Don't Buy a Used EV With an Unexplained Warning Light
A battery or EV system warning light could mean nothing — or it could mean a very expensive repair. Get an independent warning light & fault code check before you buy, so you know exactly what it means.
Fast booking • Report same day • Mobile service across the UK
Why Get Warning Lights Checked Before You Buy?
Sellers often clear warning lights before a viewing, or dismiss them as "nothing to worry about." A proper diagnostic scan tells you the truth.
Lights Can Be Cleared
A warning light can be switched off with a diagnostic tool without fixing the fault. We check stored fault codes, not just what's currently showing on the dash.
Know The Real Cause
Battery, BMS, and EV system warning lights can mean anything from a minor sensor issue to a serious cell or high-voltage fault. We identify exactly which it is.
Avoid Costly Surprises
High-voltage battery and BMS repairs can run into thousands. Our report gives you the facts before you commit, so there are no nasty surprises later.
Clear, Honest Report
You get a plain-English report explaining what each fault code means, how serious it is, and our honest recommendation on whether to proceed.
How It Works
Quick and simple — we can often check the car before you complete your purchase.
Contact Us
Call or WhatsApp us with the car details, seller location and which warning light you've seen.
We Book The Check
We arrange a convenient time with you or the seller.
Full Diagnostic Scan
We connect professional diagnostic equipment to read live and stored fault codes across the battery and EV systems.
Get Your Report
Receive an easy-to-read report same day, so you can buy with confidence.
What's Included In The Check
A complete inspection covering everything behind that warning light on the dash.
Reads both live and stored (historic) fault codes across battery and BMS systems.
Plain-English explanation of what each code means and how serious it is.
Identifies weak or imbalanced cells that could be triggering the warning.
Actual battery capacity vs. original factory capacity.
Basic inspection of high-voltage components linked to common warning triggers.
Checks whether thermal management faults could be behind the alert.
Confirms remaining battery/EV system warranty where applicable.
Plain-English summary with our honest recommendation.
Simple, Transparent Pricing
No hidden fees. Know the price upfront before you book.
Pre-Purchase Warning Light & Fault Code Check
- Full live & stored fault code scan
- Same-day written report
- Covers all major EV brands
- Mobile — we come to the vehicle
- Honest, independent advice
Frequently Asked Questions
The seller says the warning light "just came on once" — is that true?
It might be, but there's no way to confirm this without a proper scan. We read stored fault code history, which often shows a pattern the seller hasn't mentioned.
Can a warning light be cleared to hide a fault?
Yes, dashboard warning lights can be reset with diagnostic tools without the underlying issue being fixed. We check stored fault codes that a simple reset doesn't always remove.
Which EV brands and models can you check?
We check all major electric vehicle brands including Tesla, Nissan Leaf, BMW i3/iX, Renault Zoe, Hyundai Kona/Ioniq, Kia e-Niro/EV6, VW ID range, Audi e-tron, Mercedes EQ range, and more.
How long does the check take?
Most warning light and fault code checks take between 45 minutes and 1.5 hours depending on the vehicle and diagnostic access required.
Can you check the car at the seller's address?
Yes, we operate as a mobile service and can attend the seller's home, a dealership, or a neutral meeting point across the UK.
Find Out What That Warning Light Really Means
A warning light check costs a small fraction of what an unresolved battery or BMS fault could cost you. Get in touch today and buy with confidence.