Hi guys, Need your help again. The saga of the hesitation problem of my S3 continues. (see numerous other posts) Last week I eventually got round to performing the downstream and upstream lambda sensor checks as suggested by Evotista and HTC. These can be downloaded from HTC's site. http://homepage.ntlworld.com/kevin.yeoman/CheckingLambdaControlDownstreamOfCat.pdf http://homepage.ntlworld.com/kevin.yeoman/CheckingLambdaControlUpstreamOfCat.pdf (hope you don't mind me posting the links HTC) I was advised by Martin (Evotista) to check the downstream lambda sensor first. Which I did using VAG-COM. In the downstream doc above, looking at block 30, its says Bank1-Probe2 (which is the downstream one) should reach a value of 110 at least once. Well, in the 10-15 minutes doing the test on idle, it didn't reach that value. I decided to move onto the upstream sensor anyway, about another 10 mins later. Following the test steps, you look at block 30 again, this time Bank1-Probe2 achieved the 110 value. A full 20 minutes late!! Any idea why? Do you think the sensor may be playing up? There are no error codes. After work this evening I ran a VAG-COM check and looked at block 30 again. This time the Bank1-Probe1 value was 010. The first digit should fluctuate between 1 and 0, repeatedly. It wasn't doing. Anyone else seen this? All help appreciated as usual. Cheers AL PS: As you can see from the time of this post, I am starting to loose sleep over this fr#ckin problem!