Information on the Inline Engine Generation 4-Cylinder OM654 

WOW bro you are the KING! Recently I started to have problems with 654.916 engine - engine sounds plus maf check engine error. Got myself into research but met with enigma - the rockers on exhaust side fail always, deteriorate much faster than other side? And this is a rule! Tip of the hat for your conclusion, truly enlightening! Much respect!

Makes little sense to drive the pump with an electric motor. The pump needs to run when the engine runs so it needs to be driven all the time. Ok less parasitic draw it might seem BUT the power needed for the pump is proved by the alternator anyways 😅

@alouisschafer7212 common rails strive to produce even pressure at the nozzles irrespective of engine speed. So a DC fuel injection pump would do just that while at the same time reduce the stress on the crank pulley. About its power requirement, yes only a mild hybrid electrical architecture with a comprehensive regen system would work. Where an Integrated Strater Generator would not only power this pump but also the airconditioner. If this ISG can also drive the car through the stalling speeds then wolla, Direct Drive CVT transaxle has arrived😉

25000. km

The fault code P049 indicates a low flow rate of the EGR (Exhaust Gas Recirculation) low-pressure system and a pressure that is too low on the OM 654 engine. The EGR system recirculates a portion of exhaust gases back into the engine intake to reduce emissions and improve fuel efficiency. When the flow rate or pressure is too low, it can affect the performance and emissions of the engine. Here are a few possible causes and solutions for the P049 fault code: 1 - Clogged or dirty EGR valve: A clogged or dirty EGR valve can restrict the flow of exhaust gases. Check the EGR valve for any carbon buildup or blockage. Clean or replace the EGR valve as necessary. 2 - Faulty EGR pressure sensor: The EGR pressure sensor measures the pressure in the EGR system. A faulty sensor can provide incorrect readings and trigger the fault code. Test the EGR pressure sensor and replace it if needed. 3 - EGR cooler issues: The EGR cooler is responsible for cooling the recirculated exhaust gases. If the cooler is clogged or damaged, it can affect the flow rate and pressure. Inspect the EGR cooler for any signs of blockage or leaks. Clean or repair the cooler as required. 4 - Restricted EGR passages or tubes: Check the EGR passages and tubes for any restrictions or obstructions. Carbon deposits can accumulate over time, limiting the flow of gases. Clean the passages or replace any damaged tubes. 5 - Wiring or electrical issues: Inspect the wiring and connectors related to the EGR system. Loose connections or damaged wiring can cause issues with the EGR flow rate and pressure. Repair or replace any faulty wiring or connectors. It is recommended to have a professional mechanic or an authorized Mercedes-Benz service center diagnose and resolve the P049 fault code. They will have the expertise and specialized tools to accurately identify the cause of the issue and perform the necessary repairs.

Same question

Bullshite not easy to work on at all year old engines and already head gadgets giving up

This engine is junk. Rockers going out at 60-100k Water pump is tandem and it fails. In order to replace it you need to remove engine! And take apart like half of engine. Timing chain wears quickly.

Nope. This is genuine Mercedes engine, I had same doubt until few days ago.