how often do engine sensors such as the following list pack in or become problematic.

 

knock sensor

power transistor unit

throttle positions sensor

crank angle sensor and MAF's

 

it seems they go for silly money on ebay for what are effectively 17 year old cars. with no gurantee's on any of these such parts I wonder how robust they are or are people just greedy?

 

it's a bit of a moan but having restored a number of old cars the prices are a bit out of hand I feel for this model. (z32 TT)

All depends on conditions, as most of the time its dirty connectors that cause the problems, as you say they are old cars and in most casses the wiring is original and gets brittle or fouled up

MAFs are in massive demand as they are about the best out there for flow measurement capability. Common upgrade for all skyines and all 200s (and probably pulsars for that matter) ;)