Parts for your 2015 Toyota Mark x-Crank angle sensor

2015 Toyota Mark X crank-angle sensor: what it does, why it matters, and how to look after it

Yes, the 2015 Toyota Mark X uses a crank-angle sensor. Toyota’s service literature for the GRX13# series (4GR-FSE 2.5 V6 and 2GR-FSE 3.5 V6) identifies a crankshaft position sensor (commonly called a crank-angle sensor) as part of the engine control system. Toyota’s Electronic Parts Catalogue for these engines also lists this sensor, and workshop diagrams in the engine repair manual show its location on the block near the front timing cover. Denso engine management references for GR-series V6 engines likewise describe CKP (crankshaft position) and CMP (cam position) inputs as primary timing signals.

On the Mark X, the crank-angle sensor constantly reads the crankshaft’s exact position and speed. The ECU uses this data to time spark and fuel injection precisely, and to sync with the cam sensors for dual VVT-i and direct injection. Without a clean CKP signal, the engine can misfire, run rough, or not start at all. Fault codes like P0335/P0336 are common when the signal goes missing or noisy.

There’s no scheduled replacement for the crank-angle sensor on these cars, it’s a solid-state unit designed to last the life of the engine. Still, as part of regular servicing, it’s smart to:

• Visually check the sensor connector and loom for brittleness, oil wicking, or chafing.
• Look for oil leaks from the front cover or crank seal that could contaminate the sensor or reluctor.
• Scan for pending fault codes after any rough running, hard start, or stall events.
• Ensure a healthy battery and stable cranking speed, low voltage can mimic sensor faults.

If replacement is needed, a genuine or high-quality aftermarket sensor is the go. The job is typically straightforward: safe access up front, disconnect the battery, unplug, remove the retaining bolt, ease the sensor out, lightly lubricate the O-ring on the new unit, refit, and reconnect. Avoid twisting the harness, keep the connector clean and dry, and clear any stored codes afterwards. A long crank on first start can be normal while the ECU resyncs, let it idle and stabilise. If codes return, inspect wiring continuity and the reluctor ring for damage.

Common signs of a crook crank-angle sensor on a Mark X include intermittent no-start, sudden stalling at idle or on decel, misfires under load, unstable tach signal, and the MIL popping on. Addressing it early helps protect the cats and keeps fuel economy and drivability on point.

Where is the crank-angle sensor on a 2015 Mark X?

It’s mounted on the engine block at the front, reading a toothed reluctor on the crankshaft behind the timing cover. Access is usually from the front of the engine bay, on some trims, removing an engine cover or intake ducting makes life easier.

What symptoms point to a failing crank-angle sensor?

Hard starting or no-start when hot, random stalls, rough idle, misfires, a dead or jumpy tacho during cranking, poor fuel economy, and fault codes such as P0335/P0336. Because wiring can cause the same grief, always check the connector and harness as well.

Does it need routine replacement, and how long does it take to swap?

There’s no routine replacement interval. It’s replace-on-failure or when diagnostics confirm it’s out of spec. A competent technician can usually swap it within an hour, including basic checks, clearing codes, and a quick road test.