P24A4: Particulate Filter Restriction: Soot Accumulation Too High (Bank 1)
Quick Answer
Not safe to drive
P24A4 means the engine computer calculates that the diesel particulate filter (DPF) holds more soot than the maximum it allows, and that regeneration, the self-cleaning burn-off, failed, was cut short or was blocked. The filter is usually full rather than broken, so the question to answer is why it stopped burning off its soot. P2463 describes the same kind of clogged filter, and Ford Kuga 2.0 TDCi reports show both stored together. Which soot level sets which code is decided by each make's software, and public sources do not give a general rule. Bank 1 is the only filter on most diesels.
- Severity
- High · Emissions
- Estimated repair cost
- From €60 to €3600+, varies by vehicle
€60 or €3600, depending on your car.
- Forced active regeneration (manufacturer-level diagnostic software)€60–€150
- Replace DPF (OEM)€1000–€3600
A scan shows whether P24A4 is really stored on your car, which codes sit next to it and how urgent each one is. You can do this parked, with the ignition on.
A scan needs a Bluetooth OBD2 adapter (Bluetooth LE on iPhone), about €25-60; the built-in demo runs without one. See which adapter to buy
What does P24A4 mean?
P24A4 is a emissions-related diagnostic trouble code classified as high severity.
What are the symptoms of P24A4?
- DPF warning light, often with the check engine light
- Reduced power or limp mode, with an engine fault message on some cars
- Limp mode returning soon after a forced regeneration lifted it
- Higher fuel use while the car keeps trying to regenerate
- P2463, P246C or other DPF codes stored at the same time
What causes P24A4?
Mostly short or stop-start journeys, so regenerations are interrupted before they finish
: high
Another fault stopping regeneration: a failed exhaust temperature sensor, a DPF pressure sensor fault or an injector problem
: high
A DPF warning or continue-driving message left unanswered until the soot load passed its limit
: medium
Engine producing extra soot, for example from an intake or boost air leak, an EGR fault or a leaking injector
: medium
Pressure hoses that are blocked, split or swapped, or a faulty pressure sensor, so the filter is measured as fuller than it is
: medium
Ash that regeneration cannot burn off, so the filter fills with soot sooner
: medium
Is it safe to drive with P24A4?
No - address this immediately. Act within days rather than carry on as normal. Drive gently, and try the handbook's regeneration drive only if the car is not already in reduced power. If the warning stays on, get it to a workshop: a filter this full may be refused a forced regeneration, and then the job grows from a short visit to a clean or a replacement.
How do you diagnose P24A4?
- Read every stored code and the freeze frame, and note which DPF codes sit together. Codes for the exhaust temperature sensor, pressure sensor, EGR, boost or an injector often explain why the filter filled, and they come first. A basic reader gives you those codes plus ordinary live data. Soot mass, ash mass, regeneration history and a forced burn-off are manufacturer-level software territory on nearly every car.
- If power is normal and the handbook describes a regeneration drive, try it once. A warning that stays lit afterwards, or a code that returns, means the car needs a workshop.
- A workshop with manufacturer-level software can read the calculated soot load and the pressure measured across the filter. Ask at what soot level your make sets this code, since public sources give no general figure.
- Check the pressure sensing hoses for soot blockage, splits and wrong routing, and test the pressure sensor, before blaming the filter.
- If the soot load is still under the manufacturer's ceiling, the workshop can start a forced regeneration and must let it complete. Over the ceiling the software may refuse, and the filter comes off to be cleaned or replaced. A forced burn-off may only lift limp mode for a while when the cause of the failed regenerations stays unfixed.
- After a clean or a new filter, the soot and ash counters are reset or adapted where the manufacturer requires it, and the fault that stopped regeneration or made the extra soot is repaired.
- Drive normally for a few days, then have the soot load checked again to see that the filter now clears itself.
How much does P24A4 cost to fix?
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Forced active regeneration (manufacturer-level diagnostic software) | €0–€0 | €60–€150 | €60–€150 | Professional |
| Replace DPF differential pressure sensor | €40–€150 | €30–€80 | €70–€230 | Easy |
| Replace exhaust gas temperature sensor | €25–€100 | €40–€120 | €65–€220 | Moderate |
| Off-vehicle DPF cleaning (thermal or chemical) | €30–€80 | €150–€400 | €180–€480 | Professional |
| Replace DPF (aftermarket type-approved) | €550–€1100 | €150–€400 | €700–€1500 | Professional |
| Replace DPF (OEM) | €800–€3000 | €200–€600 | €1000–€3600 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
P24A4 on specific vehicles
P24A4 on Ford
Ford Kuga 2.0 TDCi
Related diagnostic codes
Common questions about P24A4
- What does P24A4 mean?
- P24A4 means the engine computer calculates that the diesel particulate filter holds more soot than its allowed maximum, and that regeneration has not cleared it. It is a full-filter code rather than a cracked-filter code; a filter that no longer traps soot properly sets P2002 or P2003 instead.
- What is the difference between P24A4 and P2463?
- Both are soot-accumulation codes, and the standard wording of P24A4 adds "too high". Public sources do not give a general rule for which soot level sets which code, because the make's software decides, and on a Ford Kuga 2.0 TDCi both have been reported together. The soot level shown by manufacturer-level software tells you more than the code alone.
- Can I drive with P24A4?
- Gently, and only as far as a workshop. The car may already be in reduced power, and hard driving with a clogged filter can damage it or restrict the exhaust. Past a certain soot level a forced regeneration may be refused, and the filter then has to be cleaned off the car or replaced.
- Will a forced regeneration fix P24A4?
- Sometimes, when the soot load is still under the limit the software allows. It can lift limp mode for a while, but if nothing is done about why the filter loaded up, the blockage returns. A new filter fitted without finding that cause fails the same way.
- How much does it cost to fix P24A4?
- A forced regeneration at a workshop is about 60 to 150 EUR. A DPF pressure sensor is 70 to 230 EUR fitted, an exhaust temperature sensor 65 to 220 EUR and an off-vehicle clean 180 to 480 EUR. A new aftermarket type-approved filter runs about 700 to 1,500 EUR fitted, and an OEM filter 1,000 to 3,600 EUR.
- Can a cheap OBD2 reader clear P24A4?
- It can show and clear the code and the freeze frame. Soot load and a forced burn-off need manufacturer-level software or a workshop on most cars. Clearing the code does not empty the filter, so the warning returns.
Read our detailed guides
Sources
- semarepair.com semarepair.com/en/faults/ford/p24a4/
- en.wikipedia.org en.wikipedia.org/wiki/Ford_Kuga