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Engine on reduce power then ‘check engine’ warning symbol

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3.3K views 5 replies 3 participants last post by  bender555  
#1 ·
During a long drive mostly at motorway speeds, 'engine on reduced power' appeared briefly on my Astras dash. I started to notice a drop in engine power, but nothing that prevented me from driving the car at normal motorway speeds and I was able to move away from junctions without a problem. Much later I noticed the check engine warning symbol, which had probably been on soon after the reduced power warning. When I arrived home I plugged an ODB2 and it came up with three error codes, although two were the same.

2x Non-confirmed code(s): P0102 Mass or Volume Air Flow 'A' Circuit Low
1x Non-permanent code(s): P0299 Turbocharger (TC) / supercharger (CS) low boost

I used the ODB2 to clear the P0102 error codes in the hope that it would solve the problem, but the P0299 code remains and there is a still a slight drop in power. Any advice appreciated.

My Astra is a 2020 69 plate 3 cylinder 1.2T Ultimate Nav 143Bhp