Peugeot 206+ - engine judders and jerks

With the above-mentioned vehicle type, it can happen that engine judder becomes noticeable. Furthermore, another symptom is that fuel consumption can also increase.

If the above-mentioned fault arises and no definite faults have been found in the periphery of the affected systems during troubleshooting, particular attention should be paid to the sensor for the coolant temperature.

This sensor is installed in the engine coolant circuit. It utilises the temperature dependence of materials with negative temperature coefficients (NTC). This means that the resistance of the sensor decreases as the temperature rises. A defective coolant temperature sensor can cause various problems. Difficulties starting the engine, increased idle speed and poor exhaust gas values can all also occur if the sensor is defective.

In the course of further troubleshooting, the temperature sensor should be checked using a suitable diagnostic device on the basis of the parameter query. If abnormalities are detected here, replacing the sensor can remedy the problem. Anomalies that indicate a defective sensor are, for example, that the engine temperature value remains static, jumps back and forth or is not plausible in relation to the actual engine temperature.

Furthermore, the resistance of the sensor can be checked with a suitable measuring device. The resistance is temperature-dependent, with high impedance when the engine is cold and low impedance when it is warm. These values can be in the following measuring ranges, for example: between 2.0 and 6 kOhm at 25 °C or around 300 Ohm at 80 °C. However, please observe the target values issued by the vehicle manufacturer.

Once the cause of the fault has been rectified, delete the error memory and then carry out a test drive.

Repair and maintenance work on the cooling system must be carried out in accordance with the manufacturer's instructions. Some manufacturers stipulate special venting routines that must be adhered to.