The car is regenerating far more often than it should. That is a symptom, not a fault in itself — something is making excess soot or interrupting the cycle.
P2459 — also written P2459, P 2459, 2459 — is the OBD-II code for diesel particulate filter regeneration frequency. Same code, same fix: this page covers every spelling of it.
P2459 is a emissions fault code, typically costing £120–£1400 to put right in a UK garage.
What causes P2459?
- Repeated short journeys interrupting regeneration
- Leaking or worn injectors making excess soot
- EGR stuck open
- Turbo seal leaking oil into the exhaust
- Poor quality fuel
How P2459 is fixed
- Injector back-leak test
- Check EGR operation on live data
- Inspect the turbo for oil leakage
- Change driving pattern to include regular longer runs
P2459 repair cost in the UK
Most P2459 repairs land between £120–£1400 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2459?
Yes, but frequent regeneration dilutes engine oil with diesel — check the oil level and change it early.
Urgency: medium.