Parts for your 2004 Toyota Highlander-Crank angle sensor

2004 Toyota Highlander crank angle sensor (crankshaft position sensor)

Yes, the 2004 Toyota Highlander is fitted with a crank angle sensor. Toyota’s 2004 Highlander Repair Manual for both the 2AZ‑FE 2.4L four-cylinder and the 3MZ‑FE 3.3L V6 identifies a Crankshaft Position Sensor (often termed the crank angle sensor) supplying the ECM with the NE signal. The Electrical Wiring Diagram for this model shows the dedicated CKP circuit to the ECM, and Toyota’s parts catalogue lists the component as “Sensor, Crank Position”. That makes the crank angle sensor directly relevant to this model.

On this Highlander, the crank angle sensor keeps the engine management on song by reporting the exact crankshaft position and rotational speed every split second. The ECM uses that data to time spark and fuel with precision, especially during start-up, acceleration and idle. If the sensor signal drops out or goes skew‑whiff, the engine can stall, misfire or refuse to start, and you’ll often see DTCs like P0335 or P0339. It’s a small bit of kit that makes a massive difference to drivability and fuel economy.

There’s no set service interval for the crank angle sensor, but it’s smart to check the connector and harness whenever the vehicle’s in for a service—look for oil wicking into the plug, brittle insulation, or rub-through near the timing cover. Oil contamination or a damaged O‑ring at the sensor can lead to poor signals and leaks, so fix those early.

Replacement is straightforward for a competent DIYer with basic tools:

1. Disconnect the negative battery terminal and let the vehicle sit a few minutes.
2. Raise the front, remove the engine under‑cover if fitted, and locate the sensor on the engine block/timing cover facing a toothed reluctor on the crank.
3. Unplug the connector, remove the retaining bolt, and gently twist‑pull the sensor out (a dribble of oil is normal).
4. Lightly oil the new O‑ring, seat the new sensor squarely, and tighten the retaining bolt to the factory spec.
5. Refit everything, reconnect the battery, clear any fault codes, and road‑test. Check under the bonnet for leaks.

Use quality parts that match the OEM spec, route the loom away from hot exhaust bits, and avoid yanking on the wiring. Most Highlanders won’t need an immobiliser or idle relearn after a CKP swap, but clearing codes and doing a short mixed drive cycle helps the ECM settle. If they’re not confident, a licensed technician can sort it quickly.

• Popular questions about the 2004 Toyota Highlander crank angle sensor

What are the common symptoms of a failing crank angle sensor?
Hard starting, intermittent stalling, rough running, surging at low speeds, and a dead‑no‑start are all common. The check engine light often logs P0335/P0339. If wiggling the sensor loom changes how it runs, the wiring or connector may be the culprit.

Can a crank angle sensor be cleaned, or does it need replacement?
If the issue is light oil contamination on the tip, a gentle wipe can help, but internal electronic faults or cracked housings require replacement. If the O‑ring is leaking, replace the O‑ring at minimum—most techs fit a new sensor assembly to avoid repeat visits.

Is a relearn needed after replacing the sensor?
Generally no special relearn is required on the 2004 Highlander. Clear codes, start the engine, and let it idle, then do a short drive with varied throttle. If codes recur, recheck connector fitment, harness routing, and sensor seating.