"Key doesn't turn in the lock. (Car has NATS immobiliser)"

The user didn't provide a description

"Think I might have a leaking head gasket, bought the car a week ago, replaced the antifreeze 3 days ago and the water has turned brownish, car is running well. Just worried it might be the issue. Not overheating."

The user didn't provide a description

"No"

"Head is cracked so needs a replacement"

"The engine is needing a complete rebuild. Just wanting to know what I should look for as a complete costs for a rebuild of an engine. Full Gasket Set? Connecting rod? Main bearings? Thrust rods? Bigend bearings? Piston rings? Oil filter? Engine oil? Alt. vbelt? Power steering vbelt? Cylinder head bolts? Radiator mounting? Cleaning material and solvents? Coolant? Push rods? Inlet valve? Exhaust valve? If I'm missing anything please add."

"Needing a new water pump but just would like to know what costs are for the part?"

"Car is getting overheated also there is a lot of white smoke coming out symptomps are more likely of blown head gasket."

"Replace head gasket and valves."