Parts for your 2015 Toyota Mark x-Camshaft sensor

2015 Toyota Mark X Camshaft Sensor — Purpose, Care and When to Replace

Yes, the 2015 Toyota Mark X uses camshaft position sensors. Technical documentation backs this up: the Toyota Repair Manual for the GRX130 series (Engine – SFI and VVT-i sections) details camshaft position sensors on both banks of the 4GR-FSE (2.5L) and 2GR-FSE (3.5L) engines, the Electrical Wiring Diagram shows “Camshaft Position Sensor Bank 1” and “Bank 2” wired to the ECM, and the Toyota Electronic Parts Catalogue lists camshaft position sensors for these engines. They’re essential for Dual VVT-i timing control and sequential fuel injection.

On a 2015 Toyota Mark X, the camshaft sensor keeps the engine management in the loop about exactly where the camshafts are. The ECM uses that signal to fire the injectors at the right moment and to trim valve timing with Dual VVT-i. When it’s healthy, you get crisp starts, smooth idle, good economy and the kind of mid-range punch these V6s are known for.

It’s not a regular “service item” like oil or plugs, but it does pay to keep an eye on it. During routine servicing, a quick look for oil seepage at the sensor O-ring, brittle wiring, or loose connectors under the bonnet can save headaches later. A scan for stored fault codes is handy too, early warnings often appear as pending codes before a warning lamp lights.

Common signs a 2015 Mark X camshaft sensor is on the way out include:

• Hard starting or long cranking when hot or cold
• Rough idle, stalling, or flat spots on acceleration
• Poor fuel economy and sluggish performance
• Check engine light with codes like P0340/P0345 and related VVT performance codes

Replacement is straightforward for a competent DIYer, though many owners prefer a workshop. There are two sensors on the V6, one per bank, mounted at the front of the cylinder heads. Usual steps are disconnecting the battery, removing the engine cover, unclipping the connector, undoing the retaining bolt, swapping the sensor (lightly oil the new O-ring), and refitting. Always tighten to the factory torque spec and clear any codes with a scan tool. Using a genuine Toyota/Denso sensor is a smart move, cheap copies can cause intermittent gremlins that are hard to chase.

If the vehicle is showing intermittent faults, also check harness routing and earths, and ensure there’s no oil wicking into the connector. With clean connectors, a good O-ring seal, and quality parts, the 2015 Toyota Mark X camshaft sensor should run for many kays without fuss.

How many camshaft sensors does a 2015 Toyota Mark X have?

The GRX130 V6 engines (4GR-FSE and 2GR-FSE) use two camshaft position sensors, one on each bank. That lets the ECM track both camshafts for proper Dual VVT-i control and precise injection timing.

What fault codes point to a failing camshaft sensor?

Common codes include P0340/P0341 (Bank 1) and P0345/P0346 (Bank 2), sometimes alongside VVT performance codes. It’s wise to confirm with live data and wiring checks, as a poor connection or stretched timing chain can mimic sensor faults.

Can it be driven with a dodgy camshaft sensor?

It might run, but it can be hard to start, lack power, or drop into a reduced-performance mode. Continued driving risks poor fuel economy and further issues. Best to diagnose and replace promptly to keep the Mark X running sweet.