OK - now that you have the code, troubleshoot the problem.
Adding upper cylinder lubricant will NOT correct a lean mixture problem, changing the fuel grade will NOT correct a lean mixture problem - you need to find out WHY the mixture is lean and fix THAT.
Take a look at this page for some possible causes.
After establishing that it's probably the MAF I found that the 2 screws
securing it have strange head with a 5 pointed star indent unlike Torx screws
with a six point shape.
Has anybody faced this problem as cleaning the MAP is straightforward but only if I can remove it.
Meanwhile will replace the PCV valve with a new one.
Car is running well with good performance and accelleration
Engine idling speed in gear has suddenly changed from 750 to 1000
Am advised that my M18A engine does not have a MAF sensor
Could my problem be the MAP or O2 sensors I wonder???
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