This code usually needs a check soon to find out what is wrong.
Trouble codes · P2459
P2459 meaning
Particulate Filter Regeneration Frequency Bank 1
The same first verdict Car Assist shows from this code alone, before a diagnosis. The code does not tell the app whether the warning light is flashing.
What this code doesn’t tell you
A code says where the car noticed a problem. It does not prove which part failed, whether the fault is still present, or what repair this car needs. The engine, other codes, freeze frame and live readings matter.
Usual causes, most likely first
The order is a starting point across cars; the exact engine and its readings can change it.
- Short trips filling the filter faster than it clears
- Engine fault producing extra soot
- Faulty pressure sensor reading
What you can check
Note any black smoke, high fuel use and how often the car makes short trips. Have the engine checked for the cause of extra soot rather than only cleaning the filter.
Words the car uses
- Stored codes
- Faults the car has confirmed and saved. They help explain a check-engine light, but a code alone does not prove which part needs replacing.
- Freeze frame
- A snapshot of the engine's readings when a fault was recorded. It helps show the conditions that caused the fault, even if the car now seems fine.
- Readiness monitors
- The car's own checks of its emissions systems. An unfinished check means the car has not tested that system yet, so a clean code scan may miss a fault.
- Diesel exhaust filter (DPF)
- A filter that catches soot in diesel exhaust. Pressure and temperature readings help show whether it is blocked or cleaning itself.
Find out what’s causing yours
Car Assist reads your car through an OBD-II adapter and your iPhone. Its assistant uses the codes, freeze frame and live readings to work through the likely cause with you.