I have had the engine check light come on twice now. When checking with vcds I get the error 17544 - fuel trim bank 1 (add) P1136 - 35-00 - system too lean. After the first time it came up I changed the MAF for a brand new genuine one. Thinking this would be the problem. However got the error again yesterday. I have also recently replaced the MAF plug with one I got second hand as the one on the car had broken an was held on place with tie wraps. I have a good connection and all of the wires were soldered and sealed with get shrink. Can anyone suggest what could b causing this? Am I barking up the wrong tree with the MAF? Thanks.