My Renault blows black smoke from exhaust

Why does this happen and how to avoid being scammed at the shop?

🚨 Don't change parts randomly

The fact that a Renault blows black smoke from exhaust is a common but dangerous symptom. Depending on the hidden error code in the ECU, the problem can range from the EGR valve to the ignition system.

Going to a traditional mechanic with such a generic symptom often ends in "repairs by elimination", where you will be charged hundreds of dollars changing parts until the problem goes away.

Diagnose your Renault yourself (AI)

Use the CarWatch AI Mechanic to read your Renault's ECU in seconds. The artificial intelligence will translate the technical data and explain the exact reason for this symptom in language anyone can understand.

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Have another symptom in your Renault?

jerks when accelerating has a flashing check engine light loses power suddenly blows white smoke from exhaust blows blue smoke from exhaust vibrates roughly at idle is hard to start cold smells strongly of gas has excessive fuel consumption makes a metallic noise in the engine

Recommended OBD2 Scanner for Renault

To extract the engine's telemetry and send it to CarWatch AI, you need an OBD2 adapter compatible with the Renault ECU.

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