richardmayer12
Peugeot 407 starting issues
Summary of the thread
A 2007 Peugeot 407 diesel is experiencing starting issues, with symptoms including a struggling engine start and flickering lights, suggesting a weak battery. Diagnostics indicate a faulty battery sensor as a potential cause. It is suggested to check the battery voltage while the engine is running and consider the possibility of a faulty voltage regulator. Ultimately, a workshop visit confirms the defective battery sensor, and its replacement resolves the issue.
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4 comment(s)
richardmayer12 (community.author)
I haven't checked the voltage with the engine running. However, when the engine is off, the voltage seems normal, which is why I am focusing on the sensor. Is there a way to confirm whether the battery sensor is defective?
timmeyer8
While a normal voltage reading when off might seem reassuring, a faulty sensor can still provide incorrect data to the car's computer, affecting charging. Given the symptoms and diagnostic reading, it is quite probable the sensor is the issue. I suggest visiting a workshop for a definitive diagnosis and repair.
richardmayer12 (community.author)
I appreciate your advice. I visited a local workshop, and the diagnosis confirmed a defective battery sensor. The repair cost, including parts and labor, was 315€. The issue is now resolved. Thank you again for your help.
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PEUGEOT
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407
timmeyer8
I had similar symptoms on my 407. Weak starts and flickering lights usually indicate a problem with the charging system. The battery voltage regulator, often integrated into the alternator, could also be at fault. Have you checked the battery voltage when the engine is running?