Parts for your 2009 Lexus Is-Camshaft sensor

2009 Lexus IS camshaft sensor — purpose, fitment, and service advice

Yes, the 2009 Lexus IS uses camshaft position sensors. Factory Lexus repair manuals (Toyota/Lexus TIS) for the 2009 IS range — IS 250 (4GR‑FSE), IS 350 (2GR‑FSE) and IS F (2UR‑GSE) — list the camshaft position sensor as a core input for the SFI engine control system. The Lexus Electronic Parts Catalogue (EPC) also shows camshaft position sensor assemblies for these engines. That settles it — a camshaft sensor is relevant and fitted on this model.

On a 2009 Lexus IS, the camshaft sensor tells the engine control module exactly where each cam is in its rotation. That lets the car run true sequential fuel injection, fire the coils at the right moment, and control Dual VVT‑i accurately for smooth idle, solid torque and good fuel economy. If the signal goes missing or skew‑whiff, the computer can’t properly sync fuelling and spark, which can cause hard starting, rough running, misfire detection and limp‑home behaviour. It’ll often log fault codes like P0340/P0341/P0345 and friends.

Most 2009 IS variants have one sensor per cylinder bank, and some high‑spec engines may use additional sensors. They generally mount at the front or rear of the cylinder head. They’re solid‑state, so there’s no scheduled replacement interval. They’re usually only replaced when there are symptoms or confirmed fault codes.

What owners can do during regular servicing:

• Inspect the sensor connectors and engine harness under the bonnet for brittle insulation, oil contamination or green corrosion.
• Fix any cam cover oil leaks promptly — oil wicking through the plug can upset the signal.
• If chasing a hesitation or long crank, scan for codes and check live data for stable cam and crank sync at cranking and idle.

Replacement is straightforward for most DIYers with basic tools, but follow the workshop procedure. Typical steps are: disconnect the battery negative, unplug the sensor, remove the retaining bolt, twist and withdraw the sensor, lightly oil the new O‑ring, refit and tighten to the factory torque, reconnect and clear codes. Use a quality genuine or reputable aftermarket part. After replacement, a short drive cycle lets the ECU verify cam/crank correlation and VVT‑i control. If issues persist, check the crank sensor and timing control hardware as well.

Popular questions about 2009 Lexus IS camshaft sensors

Where is the camshaft sensor on a 2009 Lexus IS?

On the V6 IS 250/350 there’s typically one sensor on each cylinder bank, mounted on the cylinder head near the cam caps. The IS F V8 uses sensors on each bank as well. Access is from the top under the engine cover, some variants are tucked toward the rear of the head.

What are common symptoms of a failing camshaft sensor?

Expect longer cranking, rough idle, hesitation on take‑off, reduced power, poor fuel economy, and the MIL on. Scan tools often show codes like P0340/P0341/P0345, and live data may show intermittent cam signal dropouts.

Is it safe to drive with a bad camshaft sensor?

It’ll usually start and run, but performance can be down and it may stall or enter limp mode. Short trips to a workshop are typically fine, but continued driving risks fouled plugs, higher fuel use and unpredictable behaviour. Best to diagnose and fix sooner rather than later.