Are dpf additive pump and additive pump the same thing?

Yes. "DPF Additive Pump" and "Additive Pump" refer to the same car part. Other common names include Additive Pump. The part is the same regardless of which name is used.

Can I drive with a faulty DPF additive pump?

Short journeys are possible, but DPF regeneration will not run correctly and the soot load will increase rapidly. Continued driving leads to forced ECU regeneration cycles and eventually a blocked filter.

How often does the additive tank need refilling?

Roughly every 60,000–75,000 miles (96,000–120,000 km) on most PSA diesels. The dashboard shows a warning when the level drops below threshold.

Is cerium additive harmful?

Eolys and similar additives are skin and eye irritants. Wear gloves and eye protection when handling them, and clean any spills immediately — they stain bodywork and trim.

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DPF Additive Pump buying guide — what to know before you buy

The DPF additive pump injects a cerium-based catalyst (commonly Eolys) into the diesel fuel to lower the soot ignition temperature inside the diesel particulate filter. It draws from a separate tank in the boot or under the vehicle and meters the additive in proportion to refuelling. A failed pump prevents regeneration and triggers a warning chain.

When to replace

Pump replacement is usually triggered by fault codes or low additive level despite a recently topped-up tank. The pump is a simple electromechanical device with a typical service life of 100,000–150,000 miles (160,000–240,000 km).

Additive system warning light or message centre alert
Fault codes referencing additive injection or pressure
DPF regeneration disabled by the ECU
Visible additive leak around the pump body
Pump runs but does not draw fluid — hose blockage or internal seal failure

What to look for when buying

Cerium additive systems are mostly used by PSA (Peugeot, Citroën) and some Ford and Mazda diesels. The pump must match the additive type and the tank fitting.

Match the part number to the chassis — pumps differ between PSA generations
Confirm the additive type (Eolys 176, 1Frev, DPX42) so you order the correct top-up fluid
Some pumps require the dealer tool to reset the additive counter after fitting
Replacement may include the tank float sender on integrated assemblies
Always wear gloves — cerium additive irritates skin and stains permanently

Common failure modes

Failure modes are dominated by additive crystallisation and electrical faults.

Crystallised additive blocks the pump head when the tank runs dry
Electrical motor failure — usually open circuit
Pickup tube cracks allowing air to enter and stop the prime
Wiring connector corrosion under the rear seat or in the boot
Counter-mismatch fault when the tank is topped up without resetting the meter

Related parts to check together

The additive system feeds the DPF, so faults often spread along the chain.

DPF filter — high soot load may need a forced regeneration after the pump is repaired
Diesel particulate filter additive tank — clean of crystallised deposits before refilling
DPF pressure sensor — check for blocked sensing lines
Eolys-grade additive — refill to the correct quantity using the dealer-specified chemistry