What SEAT codes (P0420, P0299, P0011, P0017, P0507, P2002) actually mean on SEAT engines — the real cause, the common misdiagnosis, and the honest UK repair cost.
These are the OBD fault codes we see most often on SEAT vehicles in the workshop, with the real cause on SEAT engines rather than the generic textbook definition, plus the honest independent-garage cost.
SEAT fault codes explained
- P0420 — Catalyst efficiency below threshold on SEAT — Ibiza, Leon and Cupra share VAG cat-monitoring sensitivity. Typical UK cost £240–£1200.
- P0299 — Turbo underboost on SEAT — Leon, Ibiza and Cupra share VAG TSI/TDI boost-leak and VGT issues. Typical UK cost £180–£1700.
- P0011 — Intake cam over-advanced on SEAT — Leon Cupra and Ibiza Cupra share VAG EA888/EA111 chain issues. Typical UK cost £240–£2200.
- P0017 — Crank/cam correlation Bank 1 sensor B on SEAT — EA888/EA111 chain stretch (Leon Cupra, Ibiza, Ateca). Typical UK cost £700–£2100.
- P0507 — Idle speed higher than expected on SEAT — Leon/Ibiza/Ateca PCV cracked diaphragm and intake hose. Typical UK cost £120–£480.
- P2002 — DPF efficiency below threshold on SEAT — Leon/Ibiza 1.6/2.0 TDI EA189 DPF clogging. Typical UK cost £180–£1400.
- P2463 — DPF soot accumulation on SEAT — Leon/Ibiza/Ateca EA189/EA288 TDI sister code to P2002. Typical UK cost £140–£1600.
- P0410 — Secondary air injection malfunction on SEAT — older Ibiza/Leon 1.6/1.8 petrol SAI pump seizure. Typical UK cost £140–£480.
Codes are generic across manufacturers, but the fix is not. The same code on a SEAT usually points at a different component than it would on another make, which is why a make-specific diagnosis saves money before any parts are bought.