5 cyl engine, about 200,000 is correct for the replacement injectors, but all dont fail at once. the injectors dont fail normally in use but ustaad "shaart testing" it will cause the ECU to shut down that injector, and most probably the engine will go into limp mode of 1500 rpm, This can be rectified by resetting the system which is not "battery disconnect" its a function called by the scanner after verifying the fault and operational requirement. If it is took on regular service intervals to dealerships with the correct tester, they can run cleaning tests and also pull the logs and check for any past faults that happened during working. Directly trying to fire the injectors with test leads is a sure way to fry them completely - I have seen that on toyota 1KD ones.The stupid testing and ham handed approach to repair of this engine will cause pain to the owner - mostly in replacing unnecessary parts. to quote an example I have pulled 11 pages of fault log on a Rexton which was refusing to start, the vehicle had never been interrogated and it kept all faults, the last 5 faults were what shut down the engine - failure of fuel pressure sensor causing BUS1 (vehicle drive control) to shut down the engine in order to protect it from damage.All the previous recommendations was the replacement of injectors - rail, regulator and pump (the total cost being WOW) - The actual repair cost was just the sensor, its replacement labor and diagnostic fee.