Parts for your 2017 Toyota Mark x-Crank angle sensor

2017 Toyota Mark X crank-angle-sensor

Yes, the 2017 Toyota Mark X uses a crank-angle-sensor (commonly called a crankshaft position sensor or CKP). This is documented in Toyota’s GRX130 Mark X repair manual and the Toyota Electronic Parts Catalogue for the 4GR-FSE (2.5L) and 2GR-FSE (3.5L) V6 engines. Toyota’s wiring diagrams on TIS also show the CKP (NE) signal feeding the engine control module (ECM), confirming it’s a core input the car relies on.

The crank-angle-sensor tracks the exact position and speed of the crankshaft. The ECM uses that data to time spark, fuel injection and variable valve timing, and to monitor misfire. If it goes missing or drifts out of range, the engine can be hard to start, run rough, or not run at all. On the Mark X, the sensor sits at the rear of the engine block near the transmission bellhousing, reading a toothed reluctor on the crank.

This part is essentially maintenance-free and isn’t replaced on a schedule. As part of routine servicing, it’s smart to keep an eye on the wiring and connector routing, especially near heat shields and the exhaust. Oil leaks at the rear main area can contaminate the connector, so fixing seepage early helps. If the ECM logs codes like P0335–P0339, or you notice long cranking, stalling, dead tach during crank, or the MIL on, a proper diagnosis should include the CKP circuit.

When replacement is needed, using a quality OEM-equivalent sensor and a fresh O-ring is the go. Under the bonnet, disconnect the negative battery terminal, then access the sensor—often easiest from underneath with the car safely supported. Unplug the connector, remove the retaining bolt, and twist the old sensor free. Lightly oil the new O-ring, insert the sensor squarely, and tighten the bolt to the specification in Toyota’s repair manual. Reconnect, clear any codes, and road-test. If you’ve had the battery off, let the ECM complete its idle learn. Keep the harness clipped away from hot or moving parts.

For most Mark X owners, the best approach is: don’t replace it “just because”, keep the area clean and dry, and act promptly on warning lights or starting issues. A quick scan with live data (engine RPM during crank) can save heaps of guesswork.

• Common symptoms: hard/no start, intermittent cut-out, MIL on with P0335–P0339, rough idle.
• Diagnostic tips: verify RPM signal on a scan tool, inspect connector and wiring, scope testing if needed.
• Service note: the air gap isn’t adjustable, correct fitment and the right O-ring matter.

Popular questions

Where is the crank-angle-sensor on a 2017 Mark X?
On the GRX130 Mark X (4GR-FSE or 2GR-FSE), it’s mounted at the rear of the engine block near the transmission bellhousing, reading the crank’s reluctor wheel. It’s typically accessed from underneath with the vehicle safely on stands.

Do crank-angle-sensors need regular replacement, and what might it cost?
There’s no scheduled replacement, they’re changed when faulty. In Australia or New Zealand, a quality sensor is often in the low-to-mid hundreds fitted, depending on workshop rates, with labour commonly around 0.5–1.0 hour. Pricing varies by brand and location.

Is it safe to drive with a failing crank-angle-sensor?
Not really. A failing CKP can cause intermittent stalling or a no-start. Misfires can stress the catalyst and leave the driver stranded. If the Mark X shows CKP-related faults or starts cutting out, it’s best to organise repair promptly.