Parts for your 2016 Toyota Mark x-Camshaft sensor

2016 Toyota Mark X camshaft sensor — what it does and how to look after it

Yes — the 2016 Toyota Mark X is fitted with camshaft position sensors. Toyota’s GRX130 series service information (TIS) and the Toyota Electronic Parts Catalogue list camshaft position sensors for both GR engines used in this model year (4GR‑FSE 2.5L and 2GR‑FSE 3.5L). The factory diagnostic charts also include cam-sensor related DTCs such as P0340/P0345 for these engines, confirming the part is used and critical to operation.

On the 2016‑Toyota‑Mark‑X camshaft‑sensor duty is all about timing and control. It tracks the exact position of the camshaft so the ECU can fire injectors precisely, manage spark timing and command Dual VVT‑i adjustments. That means smoother cold starts, better fuel economy, tidy emissions and solid pull through the revs. Lose a clean signal and the ECU goes into its “play it safe” strategy — think lazy performance, rough idle, longer crank times and a glowing MIL.

As part of regular servicing, the cam sensor isn’t a scheduled replacement item, but it’s smart to give it a look when you’re under the bonnet. Typical checks include:

• Inspect the connector and wiring looms near the cylinder heads for heat or oil damage.
• Check for engine oil leaks that could wick into the plug — oil intrusion can skew the signal.
• If removing a sensor, wipe the tip with a lint‑free cloth only, avoid harsh solvents.

Replacement is straightforward for most workshops. There are two sensors — one on each cylinder head — typically at the front near the cam gears. Standard practice is to scan for codes first (e.g., P0340/P0345), verify live data and rule out harness issues. When fitting a new genuine (Toyota/Denso) sensor, lightly oil the O‑ring, seat it squarely and tighten the retaining bolt to the factory spec from the GRX130 repair manual. After refitting, clear codes and perform a short drive so the ECU can relearn cam/crank correlation, it usually handles this automatically.

Quality matters here. Using the correct GR‑engine sensor keeps Dual VVT‑i working as intended and avoids intermittent stumbles that can masquerade as coil or injector faults. If the car’s done big kilometres and one bank shows recurring cam‑sensor faults, consider testing the other bank as well — age and heat affect them similarly. Proper oil quality and change intervals also help, as clean oil supports stable VVT‑i operation and reduces contamination around the sensor heads.

Popular questions about 2016 Toyota Mark X camshaft sensors

How many camshaft sensors does a 2016 Mark X have?
GR‑series V6 engines in the 2016 Mark X use two camshaft position sensors — one per cylinder head (Bank 1 and Bank 2). Each provides the ECU with the phase information it needs to run injection timing and Dual VVT‑i accurately.

Is it okay to keep driving with a faulty camshaft sensor?
It’ll often run, but it’s not a great idea. Expect hard starting, flat spots, poor fuel economy and potential stalling. Prolonged driving can also stress the catalyst if misfires occur. Best to diagnose and repair promptly.

Do both cam sensors need replacing at the same time?
Not necessarily. Replace the faulty unit after proper diagnosis. That said, on higher‑kilometre cars exposed to similar heat cycles, some owners choose to pre‑emptively replace both to avoid a second visit — a call to make with your technician after testing.