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Hi all new to all this I have a sg9 sti for some reason won’t go over 0.5bar not got and Engine warning lights or codes showing up but is fine once ecu is reset. Always seem to play up once I’ve done a long journey on the motorway but then stays at 0.5 bar untill reset could it be a o2 sensor or the maf any help would be great even took it to the garage and there have no idear
 
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