1. I would think is the coolant temp sensor. If it fails to send the appropriate reading to the ecu it thinks it has never warmed up. Pretty easy fix
2/3. There are tests on here to figure out if the o2 sensors are bad or not. I would just go ahead and replace them. pretty easy fix as well.
4. probably a pulled/burnt out bulb. Like Gunny said when you turn the key to the on position check to see if it lights up.
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91 Range Rover Classic
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