Signs of Faulty Injectors

The following symptoms could indicate faulty operation of your injectors:

  • smoke
  • power loss
  • no start
  • unusual engine noise
  • check engine light

If you are experiencing any of the above, you should get your vehicle diagnosed and possible get your injectors tested.

Why Get Them Tested

Continued use of faulty inectors could cause serious engine damage and exhaust system damage.

Testing your injectors will tell you...

  • If an injector is bad
  • What kind of failure it is. For example:
    • Stuck nozzles
    • Leaking nozzles
    • Body failures
    • Joint failures
    • Defective solenoids or crystals
  • Testing results could indicate the potential causes of failure that may need to be addressed outside of the fuel system. Replacing the injectors without fixing the cause of failure could lead to premature failure of new injectors, which is why proper testing is critical.


Where Do You Go?

Testing Awareness for Remanufactured Diesel Injectors

All Bosch Diesel Center, Bosch Diesel Service, and some Bosch Diesel Vehicle Diagnostics locations have the ability to test Common Rail Injectors using Bosch-authorized test equipment.





Bosch Testing vs. Competitors

Bosch test equipment is the only diesel equipment in the industry designed and benchmarked against the original equipment (OE) production testing process. The original testing process tests 100% brand new diesel injectors go through at the injector manufacturing plants.

  Competitors Bosch EPS 205
Electronic measurement system ?
Tests to OEM validated specifications
Tests at operating pressure ?
Provides Bosch Warranty verification
Provides a documented test report ?
     Has this feature    ? Unknown   Does not Have


Non-Bosch testing equipment doesn’t have genuine specifications, nor does it test remanufactured injectors at the correct pressure. This can lead to misdiagnosing, missing the diagnosis completely or turn out false positives. All of these can lead to further engine damage.