How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: UK Car
Satisfied Customers: 22993
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
Type Your UK Car Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

Bmw318d n47 2008. Particulate filter light came on. Engine

Customer Question

Bmw318d n47 2008.
Particulate filter light came on . Engine cut out. Would not restart .filter has been changed and reset on bmw software.
Engine will not start only fault code is 4b90 rail pressure monitoring on start.
Pressure sensor has been changed .
In tank pump has been replaced and can be heard running.
Both crank and cam sensors have been changed.
Wondering if the hpfp js faulty , timing chain is ok engine turns over fine but will not run.
Bob Gill
JA: Does the vehicle stall at low speeds? Does it sputter?
Customer: The were no issues with the car until the Dpf light came on and the engine cut out
JA: What is the model/year of your BMW?
Customer: 318d tourer 2008 N47 engine
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Yes
Both cam and cranks sensors have been replaced.
Common rail pressure and actuator replaced.
In tank fuel pump has been replaced.
Dpf has been Replaced and fault cleared using bmw software.
checked all electrical connection to under bonnet sensors .
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 11 months ago.
Category: UK Car
Expert:  sprinkles08 replied 11 months ago.

Hello and welcome to JustAnswer!

The high pressure pump is definitely a possibility but leaking/worn injectors are the most common cause of low rail pressure when cranking. Has anything been done with the injectors?