Mercedes GLA X156 (2014-2020)-Class Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) in the Mercedes GLA X156-Class diesel is a ceramic component located in the exhaust line after the catalytic converter. It is designed to trap harmful soot particles, including carbon, hydrocarbons, and sulfates, emitted by diesel engines like the OM651. This filter helps reduce pollution and comply with European emission standards.

The DPF traps soot particles that accumulate during low-speed or city driving. To clean the filter:

• Passive Regeneration: Occurs during high-temperature driving (e.g., highway) when exhaust gas reaches 550-600°C, burning soot automatically.
• Active Regeneration: Triggered by the vehicle's ECU if temperatures are insufficient. Fuel is injected into the exhaust to heat the catalytic converter and increase filter temperature to about 450°C to burn soot.

Some residue called ash remains after soot is burned and requires periodic cleaning or replacement of the DPF.

Common DPF issues in Mercedes GLA diesels include:

• Illuminated DPF or engine warning light, often with error code P2463 indicating a clogged filter.
• High soot load in the DPF (typically above 200-291% capacity) and increased differential pressure.
• Frequent short city trips without sufficient regeneration time cause soot and ash buildup.

This is typical for models like GLA 220 CDI 4MATIC and others with OM651 engines.

You can perform a DIY cleaning using these steps:

• Run an OBD diagnostic tool (e.g., Topdon Artidiag800BT) to check soot load and differential pressure sensor readings.
• Inject a DPF cleaning product like Xenum DPF Cleaner through the differential pressure sensor port by carefully detaching the sensor and injecting the cleaner in pulses.
• Let the product work for about 20 minutes inside the filter.
• Force a regeneration by driving at 2000-2500 rpm to burn off soot (monitor soot levels dropping and pressure normalising).

This method can reduce soot load significantly and reset warning lights if successful.

Professional solutions include:

• Forced regeneration using diagnostic tools to trigger the cleaning cycles.
• Professional DPF cleaning services specialised in Mercedes GLA vehicles.
• Complete DPF replacement with new original parts, including kits and installation manuals.

DPF replacement parts, such as brand-new filters manufactured in Europe with warranties, provide optimal reliability and performance.

The cost and time for DPF replacement are typically:

• New DPF part price: Approximately €378
• Total with labour: Between €490 and €637
• Labour time: About 1 hour and 24 minutes

This varies based on workshop rates and specific model years.

Yes, if the DPF is clean but you still get high differential pressure readings or warning lights, the differential pressure sensor itself may be faulty. It is recommended to check and potentially replace the sensor to avoid false clogging codes and ensure accurate DPF monitoring.

• Symptoms include persistent error codes without soot accumulation.
• Diagnostic testing focusing on sensor output and wiring is crucial.

Replacing the sensor can resolve some DPF-related issues inexpensively.

Use professional and technical sources for accurate guidance :

• Technical manuals like RTA or Mercedes GLA specific repair guides.
• Video tutorials on DPF cleaning and replacement, especially those covering OM651 engines.
• Trusted websites and forums dedicated to Mercedes-Benz GLA for exchange of user experiences.

Consult professionals or authorised workshops for diagnostics or complex repairs to ensure your vehicle’s exhaust system works efficiently and complies with European emission standards.