"If your Renault is showing 'Check Injection' or 'Anti-Theft Fault' after plugging in an OBD dongle—don’t panic.
Like and subscribe for more Renault fixes." Title: Renault Dongle Fault – Caused Immobiliser Failure (Megane 3)
You reported that after using an aftermarket OBD diagnostic dongle, your Renault [model] shows a and will not recognise the key card.
This is a known issue with non-Renault approved dongles. The dongle has likely corrupted the communication.
Still getting 'Card Not Detected'? The dongle may have corrupted the hands-free module. You’ll need a genuine Renault CLIP diagnostic tool to re-sync the UCH and injection computer.
Quick fix: 1️⃣ Unplug dongle 2️⃣ Disconnect battery (negative) – 15 mins 3️⃣ Lock/unlock manually with blade 4️⃣ If no fix → need CLIP tool to reset UCH
Avoid $10 eBay dongles. They can fry your CAN bus.
This is common with cheap 'Renault clip emulators' or fuel-saving dongles.