P1349 on 2007-2009 Jaguar XK (XK, XKR) — Variable Valve Timing System Malfunction (Bank 1)
1 vehicles · 1 makes · $600-$2,500 repair
How to diagnose and fix P1349: most-reported vehicles
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Jaguar XK · 2007–2009
On the 4.2 AJ-V8, worn VVT solenoids and cam phasers are a leading cause of a brief rattle on cold start-up. The locking pin in the intake-cam actuator sticks or breaks, allowing excessive cam movement (roughly 20 degrees each way) until oil pressure builds. It grows more common at higher mileage and can be aggravated by degraded or wrong-viscosity oil. While often just noise, a failing phaser/solenoid can eventually set cam timing correlation faults.
Common Symptoms
- Rattle/clatter for 1-3 seconds on cold start
- Top-of-engine noise that fades as oil pressure builds
- Rough idle when cold
- Occasional cam-timing fault codes
How to Fix
Verify with a scan and by checking cam movement with covers off; test solenoids for proper click/actuation. Replace the affected VVT solenoid(s) and cam phaser hardware, and use fresh oil of the correct grade — some owners find a switch to a quality 5W-40/synthetic reduces the rattle. Full VVT-related repairs can run well over a thousand USD due to access.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- OEM-quality AJ810570 VVT oil-control solenoidOEMAJ810570 / AJ84144 / AJ86823 / C2S4946
Electrically or hydraulically confirmed failed VVT oil-control solenoid on a 2007-2009 XK/XKR 4.2L Fitment/availability: AJ810570 is explicitly listed for X150 XK/XKR 3.5L/4.2L 2006-2009 and supersedes AJ84144/AJ86823/C2S4946. Verify VIN…
- AJ82856 VVT-solenoid sealing ringOEMAJ82856
Confirm quantity and VIN; it seals the solenoid and does not repair an electrical, oil-pressure or phaser fault by itself.
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Sources for this issue (2)
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P1349 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1349 mean?
P1349 stands for "Variable Valve Timing System Malfunction (Bank 1)." A Toyota/Lexus-specific code set when the ECM commands a change in intake camshaft timing and the actual valve timing does not change, or stays fixed. The VVT system routes oil pressure through the oil control valve (OCV) to the VVT controller to shift cam position relative to the crank. Symptoms are typically rough or unstable idle, reduced power, poor fuel economy, and a check engine light. Other manufacturers use P1349 for entirely different faults — on Honda/Acura it is generally described as a VTEC system fault, and some references list unrelated definitions — so confirm against your make.
What are the most common causes of P1349?
The most common causes of P1349 are: Low, dirty, or overdue engine oil restricting VVT oil flow, Clogged VVT oil control valve (OCV) screen or filter, Failed VVT/OCV solenoid, or a faulty connector or wiring to it, Worn or stuck VVT cam phaser (actuator) on the camshaft, Faulty camshaft position sensor or damaged reluctor/timing rotor, Stretched timing chain or a chain that has jumped a tooth. The specific cause varies by vehicle.
How much does it cost to fix P1349?
Repair costs for P1349 range from $600 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P1349?
Au7o has documented P1349 across 1 vehicle models from 1 manufacturers: Jaguar.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.