engine light problems

Hi gang, my engine light problems are still here, the garage that diagnosed the ECU are stumped as to what is causing the problem, even saying that if i went anywhere else (VOLKSTEK) to cure the problem they would not give a refund on the ECU (theres a nice hole in their showroom roof now where I went through it!).

Anyway, I used a code reader from LAND ROVER (I work for a local LAND ROVER dealer), which came up with 'P0170, fuel trim on bank 1'. And having travelled the internet on my phone I found HONESTJOHN.CO.UK, which was most helpful, saying that dirt in the air intake system can cause the engine light to come on.

So I've banged in a bottle of injection/fuel system cleaner which has restored the lost power/mpg (there is 7 years worth of crap in their after all!), but i'm thinking of putting in some water dissplacement stuff, got this idea from VWAUDIFORUM.CO.UK, from a bloke who had the same problem, this cured his car, so why not give it a go, but the engine light is still on (as the LAND ROVER CODE READER cannot turn the light off, off to VOLKSTEK to get the light turned off and sorted, now I know what the code is i'm a bit more relaxed, as it wont kill the car.

Any more ideas are most welcome, you (and vwaudiforum and honestjohn.co.uk) have come up trumps in the past, so I look forward to your replies:thumbup: