Kingconroy Posted October 29, 2022 Share Posted October 29, 2022 I bought this 64 plate gtc few months back light comes on and goes off after a couple of days the rocker cover has been changed from what I can see but pcv valve appears to be working fine just wondering if anybody has any other ideas tia allan Quote Link to comment Share on other sites More sharing options...
Vauxhall Owners Club Posted November 3, 2022 Share Posted November 3, 2022 Common causes include: - Vacuum leaks - Clogged or faulty Mass Air Flow sensor (MAF) - Faulty PCV valve or other parts of PCV system - Stuck open purge valve/solenoid - Faulty oxygen sensor - Improperly installed aftermarket intake - Low fuel pressure - Clogged-up catalytic converter Read more: Catalytic Converter: problems, replacement options. I would check the inlet manifold for any loose or cracked hoses and also any leaks, spray WD40 around areas that if drawn in the revs will increase stating that there is an air leak Also check the exhaust system for leaks as this will also flag the code Quote Link to comment Share on other sites More sharing options...
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