Firstly, your glow plug lamp has nothing to do with your brake lights - so you can dismiss that theory.
The glow plug light will illuminate for various reasons, but they are all related to the engine/sensors/emissions equipment/DPF.
All of those faults could be contributing to your DPF no longer self-cleaning like it usually does, and the flashing glow plug light is almost certainly an early indication that your DPF is getting too full.
- Some cars use the ambient temp sensor as part of the algorithm to allow the DPF self-cleaning procedure to take place
- Your coolant fan error will most definitely be a contrubutor, as the fan runs at full speed when the DPF self-clean process is taking place. So if your fan isnt working then this will be a problem - not to mention the fact that with the hotter months coming, you will need to get this fixed anyway.
- And your mass air flow sensor error is likely to be contributing as well.
Your mechanic is correct in saying that with long drives that you are very unlikely to ever have DPF issues.......but he may have failed to mention that if any of the many sensors on the engine play up that this will cause the DPF self-cleaning process to not take place.
You will need to fix all of the issues and then (fingers crossed) the DPF will start self-cleaning as usual. But, once the DPF reaches a certain level above 100% full, it will no longer self clean and the car will go into limp mode and the only way to rectify this is to have the DPF cleaned and reset by a mechanic. So the more you drive it with these faults, the higher the chances that you will need to have a mechanic clean and reset the DPF...adding extra $$$ onto your total bill.
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