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The factory 2003 Infiniti M45 shocks are monotube. It is evident by the huge piston size. For a premium luxury sports sedan as heavy as the M45, monotube shocks makes sense as they provide stable control on longer drives on different road conditions.
location of crankshaft sensors in 2004 infinity M45
Infiniti recommends using premium grade fuel in the M45 and also in nearly every other car they make.
Electronic Throttle Control Actuator http://www.infinitihelp.com/Ownership/Common/codes3.htm
The cam position sensor for a 2003 Infiniti M45 will cost about $30-40 for an aftermarket brand. For an OE (factory) part, your best bet is to call the Infiniti dealer for an exact quote. Theoretically it should be in that same price range, although it's not uncommon for OEM parts to be more expensive than aftermarket brands.
One can purchase a used Infiniti M45 on Car Gurus and Autotrader. If you don't trust purchasing cars online, then you can go to your local car dealership.
The cost of a used Infiniti M45 varies depending on how old the car is, body condition, mileage, and engine condition. Consult Kelly Blue Book for specific prices.
Unless you can feel it running rough and knocking - no.
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My Infiniti dealer wanted $2200 to replace the oil pan. The part costs about $300 and labor costs came in at $1900. You may be able to save some money by buying the part yourself and having an outside shop do the job. My local Nissan dealership said they would do it for $1500.
Its on the passenger side front right on top where you put your feet. There are 2 white twist knobs. Andd it pops out so dont be afraid to pull a little.