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BMW, 325i, Auto, Saloon, 2000X, 120k,

Starts from cold, yellow triangle with exclamation mark in middle and arrow around stays on after other dash lights go out. Runs for around 20 mins and then cuts out, all dials die. cranks over but will not re-start. However, after approx. one hour or next day engine will usually start again and run for a short period before dieing again. When engine is running seems a little lumpy! this could be psychological!

Any ideas, suggestions greatly appriciated, also could anyone advise what the following are/mean and where they my be located?
MAF
OBD
Vanos seal

Thanks Rossman.
 

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yellow triangle is your asc warning light...it'll need the codes read for a complete diagnosis.
cutting out could be a few things...again a code reading will give us an idea.
maf is a mass airflow sensor
obd is on-board diagnostics (where they'll collect your fault codes from)
vanos is bmw's take on variable valve timing...there are seal in the box on the front of the engine adjacent to the cams
 
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