Support & FAQ

EvmetricsOBD is an OBD2 diagnostics app for iPhone, iPad and Mac that works with both electric and petrol/diesel vehicles. It connects to a standard ELM327 adapter and gives you live sensor data, battery telemetry, charging graphs, fault-code (DTC) scanning, a vehicle audit and professional diagnostic reports — across 17 vehicle-specific templates.

It reads diagnostic data only. It never changes anything in your car.

Two things: a supported vehicle and an ELM327-compatible OBD adapter (Bluetooth, Wi-Fi or USB). Plug the adapter into your car's OBD2 port, open the app, go to the Dongle tab and tap Connect.

No account, no sign-up and no proprietary hardware required.

Yes — the core is free: the live sensor dashboard tailored to your model, the DTC scanner (read and clear fault codes across every ECU), and the compatible-dongle guide with a Bluetooth checkup.

Advanced tools — diagnostic reports, vehicle audit, CarPlay, journeys, workshop, fleet and more — are part of EvmetricsOBD Pro.

iPhone, iPad and Mac. The same app scales from a quick check on your phone to a full workshop session on a Mac.

This is deliberate. On launch the app doesn't auto-connect, so it never races the iOS Bluetooth permission prompt or grabs the adapter before you're ready.

Open the Dongle tab and tap Connect — the app remembers your last adapter, so it's a one-tap reconnect next time.

Any ELM327-compatible adapter. Ones we've tested and recommend include the Vgate iCar Pro, OBDLink CX / MX+ / EX, Veepeak BLE+ and Carista.

See the full adapter guide for picks by connection type and vehicle.

All three work over ELM327:

• Bluetooth LE — the default and most convenient on iPhone and iPad.
• Wi-Fi — connects to the adapter over your local network.
• USB serial (FTDI, CP210x or CH340 adapters) — the most stable for long, uninterrupted workshop sessions on a Mac.

Pick whichever your adapter supports.

Try these in order:

• Make sure the adapter is plugged in and the car's ignition is on.
• Grant the Bluetooth permission when iOS asks.
• Run Bluetooth Checkup in the app — it verifies Bluetooth is on, permitted and working.
• Check the adapter's name: the app looks for OBD adapters whose name contains obd, elm, link or carista. A generic device advertised only as “Battery Monitor” is filtered out on purpose.
• Some adapters need to be un-paired in iOS Settings first — ELM327 dongles connect directly through the app rather than through iOS Bluetooth settings.

When you first connect to a Wi-Fi adapter, iOS shows a Local Network permission prompt — you must allow it, or the app can't reach the dongle.

Then join the adapter's Wi-Fi network and confirm its IP address and port match the adapter's manual (many use 192.168.0.10 : 35000). You can re-enable the permission later in iOS Settings › EvmetricsOBD.

After you explicitly disconnect, the app won't silently reconnect on its own — that's by design. Just tap Connect again.

Your last working adapter is saved as a reconnect hint, and you can lock onto a specific adapter so the app always targets that exact hardware.

Use the built-in Connection Test. It runs the ELM327 handshake step by step and shows a live log, so you can see exactly where a connection succeeds or fails — useful for diagnosing a flaky adapter or an unusual vehicle.

Deep, model-specific support today covers the Jaguar I-Pace (2018+) and JLR petrol/diesel models — Jaguar XF, XJ, XK/XKR, F-Type, F-Pace and XE, plus Land Rover Range Rover (L405), Velar, Range Rover Sport, Discovery and Defender V8.

On these you get manufacturer-specific data like HV battery health, module temperatures, oil temperature and level, boost and gearbox temperatures. See the vehicles page for the full list.

On the Jaguar I-Pace the app reads State of Charge and State of Health, individual cell voltages, all 36 pack-module temperatures, and a live charging graph of power against SoC.

It's read-only telemetry straight from the vehicle — nothing is written back to the pack.

Yes for the universal data: on any ELM327-compatible vehicle the app reads the standard OBD2 modes ($01–$09) — live sensors, fault codes, freeze-frame and readiness monitors.

Deep, brand-specific templates for Hyundai/Kia E-GMP, VW MEB, Tesla Model 3/Y, Ford, Stellantis e-CMP, Volvo/Polestar, Porsche and Rivian are in development and shipping over time.

Yes, and it's free. The DTC scanner reads diagnostic trouble codes across every ECU it can reach, shows their descriptions, and lets you clear them.

Clearing only resets the stored code and warning lamp — it doesn't fix the underlying fault, so if a code returns it's telling you something.

It's read-only for anything that matters. EvmetricsOBD reads diagnostic data and, at your request, clears stored fault codes.

It never modifies, unlocks, re-flashes or resets manufacturer security or control systems. It can't brick or reprogram your car.

Pro adds the professional toolkit:

• Diagnostic Reports — shareable PDF/HTML reports
• Vehicle Audit — including odometer-rollback detection
• Vehicle Timeline and Backups (daily on-device snapshots)
• Full Vehicle Scanner and the CAN Buses view
• CarPlay Power Monitor
• Journeys — automatic drive logging with PDF/GPX export
• Workshop checklists and Fleet cost tracking with a 12-month forecast
• the Reverse Engineering tool

EvmetricsOBD Pro is £24.99 per year, an auto-renewing subscription billed through your Apple ID. Everything runs on-device — there's no separate account to create.

If you reinstall or switch to a new device, open the paywall and tap Restore Purchases. That re-checks your Apple ID entitlements and reactivates Pro.

Make sure you're signed in with the same Apple ID you bought it on.

Subscriptions are managed by Apple, not in the app. On iPhone/iPad go to Settings › your name › Subscriptions › EvmetricsOBD; on Mac it's App Store › your name › Subscriptions.

Cancelling stops the next renewal, and Pro stays active until the end of the paid period.

Yes. The Mac Workshop tier is sold separately, outside the App Store, through Lemon Squeezy. It's aimed at professionals who want the full workshop toolset on a Mac.

Email hello@evmetrics.co.uk if you'd like details.

Yes — CarPlay is a Pro feature. You get a dongle picker and a Power Monitor screen that refreshes about every two seconds, with trends drawn as compact Braille sparklines.

Because CarPlay uses Apple's standard driving-safe templates, it shows key figures rather than full graphics, and State of Charge is intentionally left off the CarPlay screen. You can connect over Bluetooth, USB or Wi-Fi from CarPlay.

No. EvmetricsOBD has no user accounts, no advertising, no analytics and no trackers. The diagnostic data the app reads from your car is processed and stored on your device. Nothing is sold or shared for marketing.

See the full privacy policy.

Almost never. The only network request it makes is sending your vehicle's VIN to the US NHTSA vPIC database to look up the make, model and year — nothing else about you is sent.

Everything else works offline, right next to the car.

With your permission the app uses location to record journeys (route maps and distance) and to keep logging power, charge and temperature while your phone is locked during a drive or charging session.

Location history stays on your device and is never sent to us. The app works fine if you deny it.

Optional. If you turn it on, your Garage vehicles, Workshop checklists, Fleet costs and journeys sync through your own private iCloud container, protected by your Apple ID. We have no access to it, and it's off by default.

To keep logging while the phone is locked — during a drive or a charge — the app needs Location set to “While Using the App.” Grant that and capture continues in the background; power, charge and temperature keep recording until you disconnect.

Occasionally you'll see a value that can't be real — a temperature of −50 °C, for example. This is often a sign of a low 12 V supply or a brownout during cranking rather than a genuine sensor fault: when voltage sags, ECUs report sentinel or garbage values.

Check the 12 V battery first. Our use cases walk through real examples of exactly this.