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Q: leaking oil from head gasket on 2003 Volvo XC90

The repair facility said possible head gasket for an oil leak. Is it necessary to replace head gasket, or can I just keep a check on the oil level?
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You can continue checking oil with the knowledge that at any time the oil leak can get worse so don't get into a habit of checking only every now and then. If enough oil leaks out can get on exhaust, connections, hoses, motor mount bushings, etc. Plus if is leaking oil may be leaking coolant internally at a slow rate if can not see coolant on outside. Check coolant level also.
The lamps and the secondary air injection system are not even controlled by the same control module, so you will need to narrow down the issue by inspecting to find what was damaged or moved.

It could just be coincidental, but I doubt it.

The secondary air injection system is a pump which is connected to the exhaust system. It connects to the air cleaner assembly as well, and pulls filtered air into the exhaust pipe.

This helps burn off unwanted emissions in the catalytic converter.

Inspect that system from the air cleaner to the exhaust pipe, and find where it is disconnected, or where there is anything blocking the passage of air through the pump and into the exhaust.
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