you don´t need a fault code for the component for not working as fast / accurate as it could. Might not be enough to pass the threshold for the error to be logged, but still might cause erratic problems... I drove around with that defect coil, and was getting really annoyed with the lumpy ride - and I didn´t have any fault codes either. I just switched the Spark plugs from ngk to bosch and thought the spark plugs where crappy...
What gaskets haven´t you switched yet? Air intake gaskets? Have you resetted the adaption stuff, and driven for 30 or so miles?
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if its got tits or transistors, you’re gonna have problems with it!
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