Bosch manufactures two types of injectors for common rail – solenoid and piezo. The difference between the two injectors is the speed and precision with which they inject diesel fuel. Solenoid injectors operate at 160 microseconds, and piezo injectors operate at 100 microseconds. The two technologies are not compatible – a solenoid injector can't replace a piezo injector and vice versa.
Make sure your car is being serviced by a reputable shop and ask about the parts they use on your diesel engine to ensure they are from the OEM or from an authorized Bosch supplier.
Always purchase fuel from a reputable service provider and use a proper fuel/water separator. Periodic inspection of the vehicle’s tank vent is also recommended.
The key cause of injector failures are: Poor fuel filtration Fuel contamination Incorrect installation Always follow the engine manufacturer's maintenance procedures. The majority of diesel engine problems stem from contaminated fuel. Common problems include corrosion from excessive water in the fuel, micro fine particles in the fuel and improper fuel storage, which is caused by water in the fuel. There are two ways in which water can get into the fuel: through the delivery system and through the tank vent.
The old adage "you get what you pay for" applies here. Bosch Injectors are produced to OE specifications. Cheaper alternatives can potentially cut corners. It is best to spend more and get a quality part that won't leave you stranded or worse – cause expensive damage to your engine.