Prado 120/150 D4D Injector Replacement: Part Numbers & Compatibility

Toyota Prado 120 Series
1

Replacing or upgrading D4D injectors on Prado 120 and 150 series vehicles. Determining the correct injector part number and associated parts required for replacement. Confusion regarding Euro 3 vs Euro 4 injectors, DLC (Diamond-Like Carbon) coated injectors, and the need for ECU reflashing.

Solution

  1. Injector Part Numbers:
    • Prado 120 Series (1KD-D4D):
      • Early models (before 10/2007): 23670-39185 (check VIN)
      • Later models (from 10/2007): 23670-39316 (latest/recommended, DLC)
    • Prado 150 Series: 23670-39365 (Piezo injector)
  2. DLC Injectors: The 23670-39316 injector is a DLC (Diamond-Like Carbon) coated injector and supersedes older part numbers for the Australian D4D Prado. The 23670-30280 is the same injector (Euro4 DLC) as 23670-39316 but does NOT include the sealing washer.
  3. Euro 3 vs Euro 4: Euro 4 injectors use extra pre-pilot injections compared to Euro 3. Euro 4 spec are easily identified by the EGR heat-exchange being water/coolant cooled.
  4. ECU Reflashing: Some users have mentioned the need for ECU reflashing when upgrading to newer injectors (specifically with Baileys reconditioned injectors, but potentially also when swapping from older to newer injector types).
  5. Installation Advice:
    • Follow the workshop manual (Hilux manual can be used).
    • Clean injector ports thoroughly.
    • Pressure test return pipe or closely monitor oil for contamination.
    • Use diagnostic tools to perform pressure tests and check for fuel leaks.

Parts

Essential Parts for Injector Replacement (1KD-D4D):

  • Injectors: 4 x 23670-39185 or 4 x 23670-39316 (depending on model/year) or 4 x 23670-39365 (Prado 150 Series)
  • Return Line Washers: 5 x 90904-30013
  • Injection Seat Washers: 4 x 11176-30011 (If the injectors are NOT the 23670-39316 then you will need these)
  • Injector Pipes:
    • 23701-30060 - PIPE ASSY, INJECTION, NO.1 x1
    • 23702-30060 - PIPE ASSY, INJECTION, NO.2 x1
    • 23703-30060 - PIPE ASSY, INJECTION, NO.3 x1
    • 23704-39055 - PIPE ASSY, INJECTION, NO.4 x1

Additional Parts Often Replaced:

  • Head Cover Seal: 4 x 23682-30020
  • Nozzle Seal Holder: 4 x 23681-30010
  • O-ring Seal: 4 x 96721-19017
  • Washers: 4 x 90209-10021
  • Rocker Cover Gasket: 1 x 11213-30020
  • EGR Gaskets:
    • EGR Inlet: 1 x 25628-30010
    • EGR Valve: 1 x 25627-30010
    • Diesel Throttle: 2 x 26171-30030
    • Intake Air Connector: 1 x 26171-30050
    • Venturi: 1 x 26171-30020

This technical summary was auto-generated based on recovered archives. Do not rely on its factual accuracy. Refer to the original thread. Source: View Original Conversation

Continue the discussion below.