Parts for your 2019 Toyota Mark x-Crank angle sensor

2019 Toyota Mark X crank angle sensor (crankshaft position sensor)

Based on Toyota’s technical literature, the 2019 Toyota Mark X (GRX130 series) is fitted with a crank angle sensor, referred to in Toyota documents as the crankshaft position sensor or “NE” signal sensor. The Toyota Repair Manual for the GRX130 platform, the Electrical Wiring Diagram (EWD), and the New Car Features (NCF) for the 4GR‑FSE and 2GR‑FSE V6 engines all describe an NE sensor that monitors crankshaft speed and position for ignition timing, fuel injection, and VVT-i control. The Toyota parts catalogue for GRX130 also lists a “Sensor, Crank Position” for both engines. These sources confirm the sensor is relevant and present on the 2019 Mark X.

The crank angle sensor on the 2019 Mark X is the quiet achiever that keeps the V6 running crisp. Mounted at the front of the engine near the crank pulley, it reads a toothed target on the crankshaft and feeds the ECU an NE signal so the car knows exactly where the pistons are and how fast they’re spinning. That precise timing is what lets the Mark X fire the plugs and deliver fuel bang on, and it’s also a key input for VVT‑i cam control and stability of idle. When it’s healthy, owners don’t notice it at all, when it’s not, they’ll cop hard starting, random stalling, sluggish throttle, or a dead no‑start with fault codes like P0335 or P0339.

It’s not a regular service item, but it deserves a look whenever the vehicle is in for major servicing. A sensible approach is:

• Inspect the harness and connector for oil wicking, heat hardening, or green corrosion.
• Check for metal debris stuck to the sensor tip if misfire or sync codes are present.
• Verify good battery health, low cranking voltage can mimic a bad sensor.

Replacement is straightforward for a competent tech. Disconnect the battery negative terminal, unplug the sensor, remove the retaining bolt, and twist the sensor free from the timing cover. A new O‑ring should be lightly oiled before installation. Refit the sensor squarely, torque the bolt to the factory spec (refer to the GRX130 Repair Manual for the exact figure for the 4GR‑FSE/2GR‑FSE), reconnect the plug, and clear any DTCs. If the old sensor tip was coated in sludge or filings, it’s smart to check for oil leaks and inspect the crank pulley area for abnormal wear.

Owners in Australia and New Zealand clocking up lots of motorway kilometres or dealing with hot under‑bonnet temps should keep an eye on wiring condition. The sensor itself typically lasts the life of the engine, but harsh heat cycles and oil contamination can speed up failure. When sourcing a replacement, matching the VIN and engine code ensures the correct pickup style and connector keying, and sticking with OE‑quality parts keeps the V6 sweet.

Popular questions

Where is the crank angle sensor on a 2019 Mark X?
The sensor sits at the front of the engine on the timing cover, reading a reluctor on the crankshaft near the crank pulley. Access is usually from above with the engine cover off, some trims may need the splash shield loosened for extra reach.

What are the symptoms of a failing crank angle sensor?
Common signs include long cranking or a no‑start when warm, sudden stalls at idle, uneven acceleration, and the check engine light with codes like P0335/P0339. If the tachometer doesn’t flick during cranking, that’s another hint the ECU isn’t seeing a clean NE signal.

Should the crank angle sensor be replaced as routine maintenance?
No, Toyota doesn’t list it as a scheduled replacement item. It’s replaced on condition. During major services, a quick inspection of the connector, wiring, and any oil ingress around the timing cover is worthwhile to prevent intermittent faults down the track.