A friend of mine is got an RX 300 Lexus truck, 2007, V6, with 107,524miles on it. Ever since he bought the car as a used one, it has being consuming excess fuel. Though, there is no black smoke coming out. We have tried scaning the car without success, because the CEL only displays on the cluster intermttently. We have tried checking for vacuum leaks, but got nothing. The plugs, air filter, vacuum pipes, exhaust pipes and catcon are OK. Although, the MAF sensor thermistor was very dirty, and has being cleaned. I am awaiting feedback from him, what the effects of the cleaned MAF sensor had on the car's fuel consumption.
What do you guys think could be the problem?Why won't the check engine light come on, so that we can scan it?
Appreciate your helps in advance.