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Peugeot 306 - Fault Code Translation - Roy Brown

Hi I have a 2.0 HDI 306 and it has a few fault codes showing. I have had a search online but I dont really see much compared to the VAGS i am used where most results will return reliable information. Can anyone shed any light on the most likely causes?

The car does have the EML on the dash, feels a little sluggish and intermittingly shows the STOP! light on the dash. Idle doesn't seem smooth from cold. Clutch pedal is very heavy but doesnt seem to slip.

The codes showing are

P0115 Engine Coolant Temperature Circuit Malfunction

P1521 Clutch Connector

P1517 Theft protection

P0191 Fuel Rail Pressure Sensor Circuit Range/Performance

Peugeot 306 - Fault Code Translation - elekie&a/c doctor
Are you able to check live data ? Specifically coolant temp and fuel rail pressure.