Diesel Particulate Filter Efficiency Below Threshold Bank 2
Table of contents
P2003 MERCEDES-BENZ Possible Causes
- Faulty, damaged or clogged Diesel Particulate Filter (DPF)
- Dirty air cleaner element
How do I fix code P2003 MERCEDES-BENZ?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- There is a Factory Service Bulletin for the various Mercedes-Benz models.
- Mercedes-Benz Factory Service Bulletin OBDII Code P2003
Cost of diagnosing the P2003 MERCEDES-BENZ code
The cost of diagnosing the P2003 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2003 MERCEDES-BENZ Description
Manufacturers have to implement measures to reduce exhaust gas soot emissions. The soot emissions are expelled in form of particle matter. A particle filter or trap is fitted to the exhaust system to store this particle matter. Once the filter reaches a predetermined loading a regeneration process is initiated. The purpose of the regeneration is to burn off/oxidise the soot particles to create harmless carbon dioxide, nitrogen and water. Many additional components are fitted to the exhaust system to closely monitor the operation of the particle filter. These include temperature sensors to ensure the conditions are met for regeneration and a thermal overload does not occur. An exhaust gas pressure differential sensor, to measure exhaust gas pressure across the filter. Occasionally a broadband oxygen sensor can be fitted to measure the quantity of oxygen in the exhaust gas. Some manufacturers choose to fit a fuel injector into the exhaust to inject fuel into the hot exhaust gas stream to raise the temperature for regeneration.