Check a Car in ChatGPT or Claude With Carcheck123

Can you check a car registration in ChatGPT or Claude?

Yes. Add the Carcheck123 connector, and you can check a car registration in ChatGPT or Claude without leaving the chat.

It looks up a UK car's MOT, tax, mileage and clean air zone charges from its registration. The connector is free and you don't need an account. It only reads vehicle data.

Buying the car? Outstanding finance, write-off history and stolen markers are in our comprehensive check, which is a paid check.

In Claude, the connector is available on any plan. The Free plan allows one custom connector.

In ChatGPT, you add it on the web. We've tested it on a ChatGPT Plus plan in the UK.

You add it once, using this address:

This page is part of our guide to MOT, road tax and staying legal.

How do you add it in Claude?

Since November 2026, most Claude accounts show "Plugins" in the sidebar where "Customize" used to be. If yours does, start there.

On a Free, Pro, Max or Ultra plan:

1. In the left sidebar, click "Customize", then "Connectors".
2. Select "Add", then "Add custom connector".
3. Type Carcheck123 as the name and paste in the address above. Click "Continue".
4. Under "Authentication", choose "No sign-in" if it isn't already selected.
5. Click "Add".

On a Team or Enterprise plan, you can't add it yourself unless you're an Owner. Ask an Owner to add it under "Organization settings", then "Connectors". After that, you'll find it under "Customize", then "Connectors", with a "Custom" label. Click "Connect".

How do you add it in ChatGPT?

Use ChatGPT in a web browser:

1. Go to "Plugins", at chatgpt.com/plugins.
2. Select the plus button, then "Add custom MCP server".
3. Type Carcheck123 as the name.
4. Under "Connection", paste the address into "Server URL".
5. For authentication, choose "No authentication".
6. ChatGPT shows a risk warning whenever you add a custom server. It's about connecting to servers you don't trust. Select "I understand and want to continue".
7. Select "Create as a plugin".
8. Find Carcheck123 in your plugins. Open it and select the plus button to install it.

If you use ChatGPT through work or school, your workspace's settings decide whether you can add it.

How do you ask about a car?

In Claude, click the "+" button in the chat, find Carcheck123 and turn it on for that conversation.

In ChatGPT, type @ in the prompt box and select Carcheck123.

Start with the registration, then ask follow-up questions:

• "Check your registration"
• "Show me its MOT history"
• "Would it pay the ULEZ charge?"
• "What might fail at its next MOT?"

Spaces in the registration are fine.

Claude may ask your permission before it uses the connector.

You can ask about a second car in the same chat.

What does it tell you about a car?

The answers come from DVSA and DVLA, the government agencies that hold MOT and vehicle records. Each answer is fetched when you ask, or reused from a lookup of the same car in the last few hours.

Every answer ends with a link to that car's own free car check page on carcheck123.com.

You can ask for:

• The car and its status. You get the make, model, colour, fuel, year and engine size, plus the last recorded mileage. It tells you whether the car is taxed and when the tax is due, and whether its MOT (the yearly safety test) is valid and when it runs out. It also says if the car has a SORN, which means it's been declared off the road.
• Its MOT history. That's up to the last 10 tests, newest first, with the date, the result, the mileage and the main failures and advisories. An advisory is a fault the tester noted that wasn't bad enough to fail. Our MOT check shows the same record on the site.
• An outlook for its next MOT. This is Carcheck123's in-house AI estimate, worked out from the car's MOT record. It includes the advisories most likely to turn into failures, and it isn't a guarantee. Our guide to MOT advisories explains how to read them.
• Clean air zone charges. It tells you whether the car would be charged in London's ULEZ (Ultra Low Emission Zone) and the other clean air and low emission zones. You get the daily charge and the reason. Our ULEZ check does the same on the site, and the rules are in our guide to ULEZ and clean air zones.

If the recorded mileage went down between two tests, the MOT history says so. That can have an ordinary explanation, such as a typing error, so ask the seller about it. Our guide to mileage clocking shows what else to check.

What happens to your data, and who is the connector for?

When you look up a car through Claude or ChatGPT, we record which kind of lookup it was (MOT history, for example) and which assistant sent it. We also record whether we reused data fetched in the last few hours, and whether it worked. These records are deleted after 7 days.

We use the registration to look the car up, and for one minute to stop the same plate being looked up over and over. We send it to DVSA and DVLA, and keep their answer in our server's memory so that follow-up questions within 3 hours don't repeat the lookup. It's never saved to a database. When you use the connector through the Claude or ChatGPT apps, the network address we see is Anthropic's or OpenAI's server, not yours.

The provider receives the results and handles them under its own privacy policy. Our own privacy policy has the full details.

The connector is for your own questions about a car, asked in the chat. Don't use it to check cars in bulk or from your own software. The full rules are in our terms of use.

Common questions