Parts for your 2014 Toyota Mark x-Camshaft sensor

2014 Toyota Mark X Camshaft Position Sensor — Purpose and Service Advice

Technical documentation confirms the 2014 Toyota Mark X is fitted with camshaft position sensors. The Toyota Repair Manual for the GRX130 series (Engine Control – 4GR-FSE and 2GR-FSE) lists diagnostic items for “Camshaft Position Sensor ‘A’ Bank 1/Bank 2” (e.g., DTC P0340, P0345), and the Toyota Electronic Parts Catalogue (EPC) shows a camshaft position sensor on each cylinder bank. That makes the camshaft sensor very much relevant to this model.

On the 2014 Mark X, the camshaft position sensor (often called the CMP) tells the engine control module exactly where each cam is in its rotation. With Dual VVT-i and direct injection on the GR-series V6 engines, precise cam timing data is crucial for smooth starts, crisp throttle response, clean emissions and decent fuel economy. The ECM uses the CMP signals along with the crankshaft sensor to run sequential fuel injection and to phase the variable valve timing on each bank.

It’s a solid-state Hall or magnetic pickup sensor, so there’s no scheduled replacement interval. In normal use it’s a fit-and-forget item. During regular servicing, smart operators will check for oil leaks at the sensor O-ring, inspect the connector for corrosion or broken tabs, and ensure any fault codes related to cam timing or sensor circuits are investigated properly rather than cleared and ignored.

When a camshaft sensor plays up, the Mark X can get a bit grumpy. Typical signs include:

• Hard starting or long crank, especially warm
• Rough idle, misfire feel or flat spots on acceleration
• Higher fuel use and a hesitant feel under load
• Check Engine Light with codes like P0340/P0345

Replacement on the GR V6 is straightforward for a competent tech. There are two sensors (one per bank) mounted near the front of each cylinder head. Usual best practice includes:

1. Disconnect the battery and let the ignition power down
2. Unclip the connector, remove the retaining bolt, and ease the sensor out
3. Lightly oil the new O-ring, seat the sensor, and torque the bolt to spec
4. Clear codes and verify cam/crank synchronisation with a scan tool

Owners chasing reliability should stick with quality OEM-equivalent sensors, keep engine oil fresh to reduce varnish and sludge that can upset VVT operation, and sort any wiring chafes promptly. With good oil and tidy wiring, camshaft sensors on a Mark X tend to run for years without a fuss.

Popular questions about 2014 Toyota Mark X camshaft sensors

How many camshaft sensors does a 2014 Mark X have?
Both the 2.5L 4GR-FSE and 3.5L 2GR-FSE engines use two camshaft position sensors, one for each bank. They’re located at the front of the cylinder heads near the timing cover area and feed timing data to the ECM for Dual VVT-i control.

Do camshaft sensors need routine replacement?
No scheduled interval applies. They’re replaced on condition if faults occur. During routine services, a quick check of connectors, wiring, and any oil seepage around the sensor is worthwhile, and fresh, correct-grade oil helps keep the timing system happy.

What symptoms point to a failing camshaft sensor?
Owners might notice hard starts, uneven idle, a lack of punch, increased fuel use, and a Check Engine Light. Scan tools often show codes such as P0340 or P0345. Proper diagnosis should confirm sensor signal, wiring integrity, and ECM inputs before parts are swapped.