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Just an update to help anyone else that has this issue in the future...
I had the car plugged into a Bosch diagnostic system and read live data from the Mass air flow sensor on full throttle. The voltage reading was 3volt through the rev range, this should be at least 4volt. I have replaced the MAF sensor and have covered 250miles without fault and it drives very smoothly indeed with plenty of torque throughout the rev range.
Possible cause, faulty MAF sensor fitted 9 months ago OR the new battery that was fitted just before I picked the car up. There is a chance that by jumping the car on a flat battery can blow the MAF so I was told.
Hope this helps anyone with 1126/1133 fault codes.
Gaz
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