Parts for your 2009 Lexus Is-Crank angle sensor

2009 Lexus IS crank angle sensor — purpose, service and replacement

Technical sources confirm the 2009 Lexus IS is factory-fitted with a crank angle sensor (Toyota/Lexus calls it a crankshaft position sensor). The Toyota/Lexus Repair Manual on TIS for the 4GR‑FSE and 2GR‑FSE engines (IS 250/IS 350) and the 2UR‑GSE (IS F) details the sensor, associated DTCs P0335–P0339, and tests. The 2009 IS Electrical Wiring Diagram shows the NE (crank) signal to the ECM, and the Toyota/Lexus Electronic Parts Catalogue lists a dedicated “Sensor, Crank Position” for these models.

The crank angle sensor on a 2009 Lexus IS is a small but vital bit of kit. Mounted to the engine block and reading a toothed wheel on the crankshaft, it feeds the ECU precise engine speed and position data. That’s how the ECU times fuel injection and spark, keeps idle smooth, and lets the variable valve timing do its thing. If the signal drops out, the ECU is flying blind — expect long cranks, misfires, stalling, or a complete no‑start with the check engine light on and codes like P0335 up its sleeve.

There’s no scheduled replacement interval for this sensor on the IS, it’s a condition‑based part. Still, sensible servicing helps. During routine maintenance, a quick look for oil seepage at the sensor boss, brittle loom tape, or a chafed harness under the bonnet can prevent dramas later. Heat and oil can harden the O‑ring, and a leaky rocker cover can drip onto the connector, so keeping seals in good nick pays dividends.

Replacement is straightforward with basic spanners: disconnect the battery negative, unplug the connector, remove the retaining bolt, twist and withdraw the sensor, lightly oil a fresh O‑ring, and refit. Routing the loom exactly as from factory avoids interference and false signals. Torque specs and clearances should be taken from the Lexus workshop manual, and once fitted, clearing codes and a short idle/drive cycle will let the ECU relearn. Genuine or high‑quality OEM‑equivalent parts are recommended — cheap pattern sensors can introduce intermittent cut‑outs that are maddening to diagnose.

When is it time to act? Common tells include hard starting warm or cold, sudden stalls at lights, an erratic tacho, or the engine dying and restarting once cooled. A scan tool showing an engine speed of 0 rpm during cranking is a dead giveaway. Before swapping the sensor, it’s wise to check the connector for green corrosion, verify 5V reference and ground, and inspect the harness where it passes low on the block — a quick fix there can save a few hundred dollars.

• Typical symptoms: no‑start, intermittent stall, rough idle, P0335–P0339 codes.
• Good practice: inspect wiring at every major service (every 10,000–15,000 kilometres).
• Fit quality parts, replace the O‑ring, and keep oil leaks in check.

Popular questions

Do all 2009 Lexus IS models have a crank angle sensor?
Yes. The IS 250 (4GR‑FSE), IS 350 (2GR‑FSE), and IS F (2UR‑GSE) all use a crank angle (crankshaft position) sensor. It’s essential for the ECU to synchronise spark and fuel, and it’s shown in the 2009 IS wiring diagrams and engine control diagnostics on Toyota TIS.

What are the signs the crank angle sensor is failing on a 2009 Lexus IS?
Expect hard starting, random stalls, misfires, or a complete no‑start. The check engine light usually appears with codes like P0335. On a scan tool, engine speed reading zero while cranking is a strong clue. Wiring damage or oil‑soaked connectors can mimic a bad sensor, so both should be checked.

Is there a maintenance interval for the crank angle sensor?
No fixed interval. It’s replaced when faulty. As part of routine servicing, a quick inspection of the sensor area for oil leaks and a look over the harness and connector is smart practice, especially on higher‑kilometre cars driven in hot conditions.