Is your Renault Sandero not starting or dying unexpectedly? The culprit could be a simple part.

Artigo atualizado em 31 de July de 2026 por João Daniel

You’re about to leave in your Renault Sandero, you turn the key, the engine cranks, but it simply won’t start. Or worse: you’re driving along peacefully and, out of nowhere, the car stalls at a traffic light. If you’re experiencing this, know that it’s one of the most common problems with Renault models, but the solution is usually simpler than it seems.

Often, car owners think it’s a problem with the battery or bad fuel, but the real culprit is usually… Rotation Sensor (also known as a phase sensor or flywheel sensor).

Quick Diagnostic Chart

• Difficulty Level: 2/5 (Easy/Medium)
• Risk Level: 4/5 (Risk of being stranded in the street in dangerous locations)
• Necessary Tools: 10mm open-end or socket wrench, electrical contact cleaner.

Why does the Sandero have this defect?

The rotation sensor is positioned just above the engine flywheel (between the engine and the transmission). It “tells” the car’s computer what position the engine is in so that the spark can be fired.

In Renault models, this sensor often accumulates iron filings or develops oxidation on the plug (verdigris). When this happens, the reading fails, the control unit “gets confused” and cuts off the ignition for safety reasons.

How can I identify the problem before calling a tow truck?

If your Sandero shows signs of starting but doesn’t start, check the dashboard. If the injection light stays on and, after several attempts, you smell fuel in the exhaust, it means fuel is coming through, but there’s no spark. This is a classic symptom of a dirty or faulty crankshaft position sensor.

Step-by-step solution:

1. Location: Open the hood and locate the point where the engine meets the transmission. The sensor is crescent-shaped and is secured by two 10mm screws.
2. Preventive Cleaning: Often, simply removing the sensor and cleaning the magnetic tip (which gets covered in iron dust) solves the problem. Use a clean cloth.
3. Electrical Contacts: Disconnect the plug and apply contact cleaner spray. The Sandero’s vibration often loosens the pins of the original connector.
4. Replacement: If cleaning doesn’t solve the problem, replacement is necessary. In the Brazilian market, there are kits that already come with a new wiring harness, as Renault itself identified that the old connector was too sensitive.

Expert Tip: The “Trick of the Trade”

If you’re on the road and your Sandero stalls, an emergency technique that often works is to disconnect the sensor plug, blow lightly to remove any dust, and then firmly reconnect it. This usually gives you enough time to get to a repair shop or home.

Attention: If your Sandero is the newer model (SCe engine), this sensor is a little more hidden, but the principle of failure is the same. Keep the cooling system in good condition, as excessive heat in the engine accelerates the drying out of the wiring of this sensor.

Conclusion

Owning a Renault Sandero means it’s known for its robustness, but small electrical details can be alarming. Keeping the crankshaft position sensor clean or replacing it with a quality part (preferably original or from brands like Bosch/MTE) prevents you from having to spend money on expensive towing services for a part that costs very little.

Did you like this tip? If your Sandero is showing other symptoms, such as noise in the suspension or high fuel consumption, leave a comment so we can analyze the next problem!