Hi AJH
It seems that lambda problems are beyond the knowledge of my garage man too. I asked him to look at some kind of air leakage before fiddling with sensors. He said go to a specialist technician/electrician. I give up. But thanks John - I've been reading through the American Lexus forum - start by simply cleaning MAF sensor. The diagrams are really clear so even I can have a go when I have a spare hour.
Do you think by just disconnecting the battery for 20 mins, the dashboard lambda light will clear? Then I'll know whether it's the MAF or not.
Cheers
D
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