Parts for your 2018 Toyota Mark x-Crank angle sensor

2018 Toyota Mark X crank-angle-sensor: purpose, servicing and replacement

Yes, the 2018 Toyota Mark X is fitted with a crank-angle sensor (commonly called the crankshaft position sensor). Technical sources including Toyota’s GR-series engine Repair Manuals for the 4GR‑FSE and 2GR‑FSE (NE signal description), Toyota EWD (wiring diagrams), and OBD-II DTC references (e.g., P0335/P0336) all specify a crankshaft position sensor that feeds the ECM with engine speed and crank angle data. That makes the part absolutely relevant to the 2018 Mark X.

On the Mark X, the crank-angle sensor monitors the crank’s exact position and rotation speed, letting the ECM time fuel injection and spark down to the degree. If that signal goes walkabout, the engine can crank but not fire, stall at idle, hesitate under load, or throw a MIL with codes like P0335. It’s a small sensor doing a big job—without it, the ECM can’t coordinate spark and fuel properly.

As part of routine servicing, this sensor isn’t a scheduled replacement item, it’s “inspect and replace if faulty.” Still, a bit of attention under the bonnet helps. Check the harness and connector for heat-hardening, oil wicking, or green crust on the pins. On GR engines, the sensor lives low on the block, so road grime, oil leaks, or a weeping O‑ring can cause drama. If removing it, expect a snug O‑ring seal—twist gently rather than prying. Wipe away any metal fuzz on the tip and avoid harsh solvents.

Replacement is straightforward:

• Disconnect the negative battery terminal.
• Access the sensor at the block, unplug the connector, remove the retaining bolt, and withdraw the sensor.
• Lightly oil the new O‑ring, seat the new sensor, and torque the bolt to the value in the Toyota Repair Manual.
• Reconnect, clear DTCs, and check for oil leaks. If idle’s a bit off, allow the ECM to relearn at warm idle with loads off.

Quality matters—use an OE or reputable brand so the signal shape and reluctor gap play nicely with the ECM. For drivers around Australia and New Zealand, parts availability is good and labour time is modest, making proactive replacement sensible if the connector’s brittle or the sensor’s been soaked in oil for ages. If symptoms are intermittent, scan data (engine speed during crank, NE signal dropouts) can confirm a failing unit before it strands anyone.

Popular questions

Where is the crank-angle sensor on a 2018 Toyota Mark X?
On GR-series V6 engines it’s mounted low on the engine block near the crankshaft, typically at the transmission end. Access can vary with undertrays and exhaust shielding, a torch and a small ratchet usually do the trick. Look for a single sensor with a two- or three-pin connector and a single retaining bolt.

What are common symptoms of a failing crank-angle sensor?
Hard starting, random stalling, misfires at low rpm, a dead tach during crank, and the MIL with codes like P0335/P0336 are classic. Some Mark X owners notice the car starts fine when cold but cuts out warm—heat can aggravate an ageing sensor or brittle connector.

Does the crank-angle sensor need regular replacement?
There’s no fixed interval. It’s replaced on condition—damage, oil intrusion, corrosion, or confirmed signal faults. Given low part cost and modest labour, many shops in AU/NZ will suggest replacement if the connector’s tired or the O‑ring is leaking, especially on higher‑kilometre cars.