Parts for your 2004 Lexus Is-Crank angle sensor

2004 Lexus IS crank angle sensor: purpose, fitment, and servicing tips

Based on technical sources, the 2004 Lexus IS (XE10 series) is fitted with a crank angle sensor. The Lexus Electrical Wiring Diagram (EWD) for the 2004 IS and Toyota service literature for the 1G‑FE (IS200) and 2JZ‑GE (IS300) list a Crankshaft Position Sensor (NE signal) as a primary engine control input, and engine diagnostics for this model define DTCs such as P0335 (Crankshaft Position Sensor “A” Circuit). That confirms the crank angle sensor is relevant and used on the 2004 Lexus IS.

On this model, the crank angle sensor (Toyota calls it the crankshaft position sensor) is the ECM’s timekeeper. It watches a toothed wheel on the crank and feeds precise position and speed signals, letting the ECM fire the spark and inject fuel bang on time, manage VVT‑i, and stabilise idle and cold starts. If it goes missing or drifts off, the engine may stumble, stall, or not start at all.

There’s no scheduled maintenance for the sensor itself, but it does benefit from a bit of mechanical sympathy during routine servicing. Heat, oil contamination, metal filings on the tip, or a tired connector can make the signal messy. A quick look under the bonnet at the lower timing cover area (by the crank pulley) for harness chafing or a weeping front seal is a smart move. A scan tool check for clean RPM during cranking and no pending P0335‑type faults is another easy win.

Common signs that prompt replacement include:

• Hard starting, intermittent stalling, or a dead crank/no‑start with a working starter
• Check engine light with P0335–P0339 codes
• Erratic tacho, rough idle, or sudden loss of power

Replacement is straightforward for a trained tech. Battery off, connector unclipped, mounting bolt out, and the sensor slides from the timing cover. The O‑ring should be renewed and lightly oiled, the bore gets a quick clean, and the new sensor is seated squarely and tightened to factory spec. After refit, clear codes, crank to confirm a steady RPM signal, and check for oil leaks. On high‑kilometre cars, it’s wise to inspect the front crank seal and the loom routing near the radiator support. Genuine or high‑quality aftermarket parts are recommended—cheap copies can be fussy with signal strength and heat.

Owners chasing intermittent faults should also consider the companion cam angle sensor and the engine earths, as poor grounds can mimic sensor dramas.

FAQs

Does a 2004 Lexus IS have a crank angle sensor?
Yes. Both the IS200 (1G‑FE) and IS300 (2JZ‑GE) engines use a crankshaft position sensor (often called a crank angle sensor) that feeds the ECM with the NE signal for timing and fuel control. It’s mounted at the lower timing cover area reading a toothed wheel on the crank.

What are the symptoms of a failing crank angle sensor on a 2004 IS?
Typical clues include hard or no starting, intermittent stalling at idle or when hot, an erratic or dead tacho, rough running, and the check engine light with codes such as P0335. The engine may crank strongly but refuse to fire because the ECM can’t “see” crank speed/position.

Is replacement a DIY job and how long does it take?
Access is tight but doable with basic tools, many workshops book 0.5–1.0 hour. Expect parts in the $120–$300 AUD/NZD range depending on brand, plus labour. DIYers should disconnect the battery, avoid damaging the O‑ring bore, and follow factory torque specs. If in doubt, leave it to a pro—misalignment or pinched seals can cause leaks or repeat faults.