Delphi EX631158 is a Delphi remanufactured F2P smart fuel injector for the PACCAR MX-13 12.9L engine built to the 2015 (MY15) EPA13 spec, used in Kenworth and Peterbilt trucks. It replaces PACCAR 2005596 (exchange 2005596PEX) and the earlier PACCAR 1993389. PACCAR describes 2005596PEX as the “MX-13 EPA13, 15B/16” injector. Delphi’s new-unit number for the same injector is BEBJ1D02001.

Delphi was the original injector supplier for the MX-13. Each remanufactured unit gets a new nozzle, NOP spring and electrical connector, is tested for leaks, injection pressure, fuel delivery and timing, and carries its own trim code. Replace for misfire, rough running, smoke, low power, hard starting or injector fault codes. PACCAR changed MX-13 injectors several times, so match the number before you order.

Specifications

Fits / Applications

• PACCAR MX-13 12.9L EPA13 engines, MY15 build (PACCAR: “MX-13 EPA13, 15B/16”)
• Kenworth and Peterbilt trucks with that MX-13 engine

Program each injector’s trim code into the engine ECU with a PACCAR-capable service tool after install. Fit new body O-rings and a new copper chamber washer; do not reuse the old seals. Change the fuel filters at the same time.

Part Numbers & Cross Reference

PACCAR 2005596  ·  PACCAR exchange 2005596PEX  ·  PACCAR (earlier number) 1993389  ·  PACCAR exchange (earlier number) 1993389PEX  ·  Delphi new unit BEBJ1D02001

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

Which PACCAR MX-13 engines take Delphi EX631158?

The MX-13 12.9L built to the 2015 (MY15) EPA13 spec, used in Kenworth and Peterbilt trucks. PACCAR lists its exchange number 2005596PEX as the MX-13 EPA13, 15B/16 injector. The engine uses 6.

What PACCAR numbers does EX631158 replace?

PACCAR 2005596 (exchange 2005596PEX) and the earlier PACCAR 1993389 (exchange 1993389PEX). Delphi’s new-unit number for the same injector is BEBJ1D02001.

How is EX631158 different from EX631145 and EX631155?

They are separate Delphi parts. EX631145 is PACCAR 1925657, 1952045 and 1972591 for 2012 to 2016 MX-13 engines, and EX631155 is PACCAR 2022949 and 2047600 for the 2017 EPA17 MX-13. Send us the PACCAR number on your old injector or the ESN and we will confirm the match at no charge.

Is there a core charge on EX631158, and does it need a trim code?

Yes to both. A refundable core charge is added at checkout and refunded once your rebuildable core reaches us. Each injector carries its own trim code, programmed into the engine ECU with a PACCAR-capable service tool after install.

Related Parts

• Stanadyne Performance Formula Diesel Fuel Additive | 1/2 Gallon (64 oz) | Part No. 38566
• Stanadyne Performance Formula Diesel Fuel Additive | 5 Gallon Pail | Part No. 38567

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. Confirm fitment against your engine serial, VIN or build date before you order. Call us and we will help you match the right part.

Not sure the injectors are the problem? We test and diagnose in-house before you buy. See our common rail injector testing and rebuild service.