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Any bolt or faster can snap or seize on a car, garages tend to factor in time for when it happens. But on a glow plug or spark plug, it's rare, but when it happens your pretty buggered. Hopefully the £150 call out guy can get it out, failing that, cylinder head off.!
In the garages view, it's not their fault they are dealing with your corroded glow plugs. But some garages will rush, when actually you want the car in the day before and fill the plugs with penetrating oil (kroil my fav!), then work on it next day, way higher chance of success.
As lynx says, if it started fine during Low temps it's unlikely that new plugs will fix it anyway.
Just had similar on a audi q2 with erratic running at idle and low revs, fault code said cam sensor, pricey but worked out everything else that it could be and eliminated it, then pulled trigger on sensor, fixed, one happy guy.
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BrickMan
Please can I have some garage advice?
Mid December I dropped my car into a garage for an engine diagnostic as I had an engine warning light. £50. Was either the cam sensor or the glow plugs iirc
He couldn't do any more work that day so booked it in for yesterday.
£250 for a new sensor, decided against as the car isn't worth much.
£190 for new glow plugs. I said yes.
Get a call today saying the broken glow plug has snapped and it'll be +£150 on top of the £190 as they need an engineering firm to come out.
There was no warning that this might happen and that work needs doing, as the car won't currently start ..
I could potentially get behind splitting the extra £150 but not sure why I should be paying all of it given the lack of warning
Cheers