What Jaguar codes (P0420, P0087, P0299, P2002) actually mean on Jaguar engines — the real cause, the common misdiagnosis, and the honest UK repair cost.
These are the OBD fault codes we see most often on Jaguar vehicles in the workshop, with the real cause on Jaguar engines rather than the generic textbook definition, plus the honest independent-garage cost.
Jaguar fault codes explained
- P0420 — Catalyst efficiency on Jaguar — AJ-V8 5.0 NA/SC and AJ200 2.0 Ingenium petrol cat issues. Typical UK cost £600–£2800.
- P0087 — Fuel rail pressure too low on Jaguar 3.0 TDV6 (XF/XJ) — HP pump wear, well-documented PSA-shared issue. Typical UK cost £650–£5500.
- P0299 — Turbo underboost on Jaguar 2.0d/3.0 TDV6 — actuator wear and intercooler hose splits on XE/XF/F-Pace. Typical UK cost £180–£2400.
- P2002 — DPF efficiency below threshold on Jaguar — 2.0d Ingenium and 3.0 TDV6 DPF clogged on XE/XF/F-Pace. Typical UK cost £260–£3200.
Codes are generic across manufacturers, but the fix is not. The same code on a Jaguar 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.