DPF off explained

What the DPF does

The DPF is a ceramic filter in the exhaust that catches soot particles produced by diesel combustion.

As soot builds up, the ECU estimates the load from pressure across the filter and its own models. When the load is high enough, it runs a regeneration that raises exhaust temperature so the soot burns off.

Regeneration needs sustained heat, so short trips and low load can leave the filter partly loaded. That is one of the most common reasons for repeated regeneration and warning lamps.

What a DPF off file changes

A DPF off file is a binary calibration. It changes how the ECU monitors and manages the filter, for example by stopping regeneration requests and the related monitoring.

A file does not clean the filter, remove soot or repair a damaged DPF. Those are workshop tasks. BRV Tuning supplies the binary only and does no hardware work.

Emissions-related files are supplied for off-road, competition, agricultural and export use only, and must not be used on public roads.

DPF off, standalone

Pricing: Master file price €41 ex VAT · slave (Tier E) €25.

The standalone file is ordered on its own, for a car whose only requirement is the DPF calibration.

Send your original read, the ECU part number and a note of any exhaust changes, since these affect what the ECU reports.

Common codes

• P2002Diesel particulate filter efficiency below threshold (Bank 1). The ECU estimates the DPF is not trapping soot as well as expected.
• P2463Diesel particulate filter soot accumulation. The ECU estimates a high soot load in the DPF.
• P2452Diesel particulate filter pressure sensor circuit. The DPF differential pressure sensor reports a fault.
• P2459Diesel particulate filter regeneration frequency. The DPF is regenerating more often than the ECU expects, which usually points to high soot loading.

DPF off, with a stage

Pricing: Master file price €24 ex VAT · slave (Tier E) €14.

The add-on is sold inside a job with a Stage file, which is why it costs less than the standalone file. The two calibrations are written together, so the add-on cannot be ordered on its own.

DPF off, truck and agricultural

Pricing: Master file price €150 ex VAT · slave (Tier E) €91.

Truck and agricultural DPF files use heavy-duty ECU calibrations and are priced separately. The same off-road notice applies. See the truck and agricultural guide.

Symptoms people usually report

• Frequent regeneration, often on short journeys.
• A DPF or engine warning lamp that comes on and goes off.
• Reduced power or limp mode while the filter regenerates.
• Higher fuel use during regeneration.
• A DPF pressure fault after the filter has been replaced or cleaned.

Before you order

Check the filter's condition first. A blocked, cracked or missing DPF will not be fixed by a file. Have a workshop inspect it if it has been warning often.

Results vary by engine, fuel, condition and supporting hardware, and no gain or outcome is guaranteed.

Common fault codes

Codes vary by make, model and ECU. Read the stored codes on your own car before and after flashing.

• P2002Diesel particulate filter efficiency below threshold (Bank 1). The ECU estimates the DPF is not trapping soot as well as expected.
• P2463Diesel particulate filter soot accumulation. The ECU estimates a high soot load in the DPF.
• P2452Diesel particulate filter pressure sensor circuit. The DPF differential pressure sensor reports a fault.
• P2459Diesel particulate filter regeneration frequency. The DPF is regenerating more often than the ECU expects, which usually points to high soot loading.