P0340 is reported as camshaft-position sensor circuit fault. The next step depends on the full scan and the exact vehicle, not the code alone.
If the check-engine light is flashing, the engine runs roughly, or the vehicle is losing power, pull over safely and arrange help. Otherwise save the scan and arrange diagnosis.
This Ford document supports only its stated code and vehicle context. The code alone cannot identify a failed part, prove that another make uses the same definition, or clear a car for driving. Compare your full scan with the current exact-vehicle service information.
Read the Ford original: 1999 Powertrain Control/Emissions Diagnosis DTC descriptions Source date: document date not recorded; research checked: 2026-11-01.
What this code means
P0340: Camshaft-position sensor circuit fault. This is a source-scoped technical description. It does not prove that any named component has failed.
Namespace obd_reference
Make scope No exact vehicle application established
Definition status source supported definition vehicle applicability unverified
Why this exact code matters
This code reports a camshaft-position sensor circuit issue. It does not by itself establish that a timing chain, cam sensor or actuator failed; compare signal, power, wiring and mechanical symptoms in the exact vehicle procedure.
Compare P0010: cam-actuator control. A related code is a different observation, not a second diagnosis.
Evidence to save for this code
- Full code, bank and A/B sensor suffix
- Oil-pressure warning or mechanical noise
Keep the complete module scan and any accompanying warning; a single emissions code cannot show every relevant fault.
Ask for a measured diagnosis
- Are oil condition/pressure, actuator control, wiring, mechanical timing or calibration responsible?
- Does the BRZ bulletin match the exact vehicle and codes?
The Cam timing/correlation needs engine-specific diagnosis guide has the shared system checks and after-repair questions. Those broad checks apply to a system, while the meaning above is specific to P0340.
Vehicle and scanner limits
We have not verified this code for every make, model, year or engine. A generic emissions scanner may not read the body, chassis, transmission or EV module that holds related faults. Compare the full scan with the owner manual and manufacturer service information.
Sources and scope
- Ford — 1999 Powertrain Control/Emissions Diagnosis DTC descriptions Document: date not recorded · Research checked: 2026-11-01
- Ford — Gasoline OBD System Operation Summary MY 2024–2025 Document: 2024-04-16 · Research checked: 2026-11-01
- Ford — OBD System Operation Summary, gasoline 2020–2023 update Document: 2023-10-23 · Research checked: 2026-11-01
- Subaru — 09-128-24R Document: 2024-11-14 · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.