I have a 2000 model 306 Hdi, Occasionally it refuses to start.
The first time it happened, the AA guy that came found no firing signal at the injectors. He found that the voltage at one of the fuses ( I can't remember the circuit, but I can find it when needed, see later) was very low, at about 5 or 6 volts.
To start the car, he linked the fuse directly to the Battery positive and then started the engine. Once started the jumper wire was removed and all went well, for a few days.
At the next service, the PUG garage connected the diagnostic computer ( at a charge of £25.00 ) and then "updated the software" as a cure? That worked for a couple of weeks, then the same again. The only way to start the car when it is playing up, is to link the 2nd 15A fuse from the bulkhead to the battery +ve, then crank. removing the link once the engine is running.
Any ideas what is going on please ? ? ?