2006 Range Rover Supercharged - engine faults to 'reduced engine performance' unless you use 93/94 octane fuel - especially in mountainous terrain - is this a bad sensor of some kind? The engine is supposed to be able to run on regular fuel..
It has been doing this for a long time but we live on the coast where it is flat and it does not bother us unless we trip to the mountains.
Vehicle is now 13 years old probably needs some maintenance to fuel and combustion chambers...Can you call me?
You a mechanic? Cleaned intake? what did that involve?
Sorry should have said throttle body - finally got codes misfire on 5 & 6 - changed both coils and new plugs all around for good measure...test drive was good - will have to run out fuel and test low octane to see if problem returns.