Good day, dear Elkdompteure! Was last Friday at the main examination and see, my energetically meaningful car is suddenly an environmental sin, because instead of the allowed 0.3 CO according to the test report 0.364 were determined (in case of lean mixture). Since of course the friendly ones all hold the hand nicely far, in terms of troubleshooting promise without success, I first try it here rather my luck, since most here probably know more than most friendly ones. My Elc h (V70 I, 2.0 liters, B. ’98) has a quarter of a million on the clock, automatic transmission, an LPG system and a VERY comfortable driving owner. Will try to get somewhere on the lifting platform to examine exhaust system for holes… or would it make sense to exchange the Lambda probe at a flat rate? KAT exists for quite little, but why exchange if he still does? Moreover, without a significant infrastructure, the exchange is also rather difficult for professionals… Oh yes: when he’s VERY undertouring he sounds like a sine wave, until you give a little bit more gas, so that shouldn’t really do anything… or does it? I hope you can help me/us.