Subaru Outback 3 litre RN 2004 Starting problem.
Can anyone help with a longstanding problem?
The vehicle is fitted with a factory fitted Sigma (Thatcham Catagory 1) alarm as standard. The alarm does all that it is supposed to and the key fobs have new batteries.
The vehicle ALWAYS starts on being unlocked and started immediately. However if left unlocked (whilst buying petrol for instance) it sometimes fails to start.
I use standard procedure and put they key in ignition lock, press the button on key fob and usually you can hear a faint click as the immobiliser disengages. Turning the key further and engaging the starter results in engine starting, but not always. I then repeatedly press the button on fob and try starting or lock and unlock the vehicle and eventually it starts and has always started but I am concerned that one time it won’t.
12 months ago my local garage downloaded the faults on the vehicles computer and erased them. These apparently were low battery warnings. The vehicle never failed to start after that. However the vehicles battery slowly discharges over a period of a week/ten days and when you unlock it and start it a single beep noise occurs which I associate with a low battery warning. (This beep never occurs at any other time). Four months ago the garage checked the battery again. It was fine. It is receiving a full charge from the alternator and with everything switched off the battery discharge rate is within tolerable limits.
Where do I go from here?