The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust as the exhaust exits the engine. Monitoring oxygen levels in the exhaust is a way of gauging the fuel mixture. It tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen).
There is no other way to say it: Legoland is the worst value for money of any theme park bar none. It's hard to know where to start: the Â£132 admission fee for a family of four, the Â£15 per person for the queue jumping system (that's free at all Disney parks), or the cynical Â£2 charge to leave the car park!
Legoland Windsor is currently open for the 2017 season. It is open on selected days from now until the end of October 2017. The park itself opens at 10 am. However, you can purchase gate tickets and enter The Beginning area (which contains shops, toilets, a restaurant, buggy hire and the customer services area) from 9.30 am.