SonGoKu619 said:
Okay so I got my o2 sensors replaced by the garage that I bought the car from (Free

)
And it's gone from 18-24l/100km Down to 11l/100km (In town) What a reLIEF!
Now I can use the friggin kickdown
Thats a huge difference. Thanks for updating us on your experience.
Just to add further closure to the reason I started this thread: My CEL was on and I was told its the cats. I changed the cats and the light was still on. I was getting a lean code on bank 1 and bank 2. I bought some adapters for the post cat O2 sensors, hoping they would kill the light, but they did not. Oh and i did notice that I was getting a hesitation at high rpm. When accelerating, the car felt like it changed into higher gear but it didn't, it was like a flat spot in the rev range at around the 5k rpm. So I had a spare maf sensor at home and decided to put that in. Well, the weather was rainy, to put it mildly so I was driving pretty sensibly since. The good news is that the CEL went off and stayed off.
BUT Yesterday the road was dry.......
Now I know what a 540i feels like! The power was on another level! That flat spot is gone. It accelerated smoothly and hellishly quickly to the end of the rev range and WOW! Before I knew it I was hitting over the 200km/h mark with a gear to spare on a steptronic and the sound when it upshifts is thrilling (on the racetrack in my backyard btw :thumb

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I did clean my maf once before but that didn't really make any difference, it may have been too far gone by then.