what is a p0340 and how to fix
It means that your Camshaft Position Sensor is problematic. This has probably resulted in a really badly-running engine, and I urge you to take the car to a qualified foreign car mechanic (NOT to a chain-run place like Midas, Meineke, Monro, Pep Boys, Sears, or–God forbid–AAMCO) before you cause permanent and expensive damage to the engine.
I’ll assume you have this code on your mini cooper?
any engine work recently performed?
any issues, such as extended cranking times, before it does actually start?
Is the connector properly plugged in?
Any obvious rat damage, in regards to the wiring going to that specific sensor?
can I drive it
If the engine will start you can drive the vehicle. Some engines run just fine without a camshaft sensor signal, just have a longer than normal crank time.
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Yes, you can drive it–as long as the CEL is not blinking/flashing.
A blinking/flashing CEL=engine damage if you continue to drive it.
A steadily lit-up CEL=have the problem diagnosed at your earliest convenience.
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