P242F — Diesel Particulate Filter Restriction – Ash Accumulation
Category: Powertrain Severity: Medium
Updated:
DTC code P242F means: Diesel Particulate Filter Restriction – Ash Accumulation. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include particulate filter at end of life (ash), engine oil not DPF-compatible (not low-SAPS) and engine oil consumption; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Particulate filter at end of life (ash)
- Engine oil not DPF-compatible (not low-SAPS)
- Engine oil consumption
- Ash counter not reset after a DPF replacement
Symptoms
- DPF or engine warning light
- Very frequent regenerations
- Loss of power
- Limp mode
How to diagnose it step by step
- Read ash and soot load with a scan tool.
- Check whether the counter was reset after past work.
- Check engine oil consumption.
- Clean or replace the DPF.
- Reset the adaptation values.
How to fix it
Ash doesn't burn off during regeneration: the filter needs professional cleaning or replacement. Always use low-SAPS oil meeting the manufacturer's spec.
Estimated repair cost
Professional DPF cleaning: $300–600. New DPF: $1,000–3,500.
Frequently asked questions
What does DTC code P242F mean?
Diesel Particulate Filter Restriction – Ash Accumulation.
Is code P242F serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P242F?
Drive as little as possible: a heavily restricted DPF raises backpressure and can damage the turbo.
Related codes
P244A P244B P2452 P2453 P2458 P2463
Refine by car make
🛒 Buy engine parts at Autodoc (affiliate link)