Parts for your 2010 Lexus Is-Camshaft sensor

2010 Lexus IS camshaft sensor — what it does and when to replace it

Per Lexus/Toyota factory repair manuals for the 4GR‑FSE (IS 250), 2GR‑FSE (IS 350) and 2UR‑GSE (IS F) engines, and the Toyota Electronic Parts Catalogue, the 2010 Lexus IS range is equipped with camshaft position sensors (CMP). The V6 models use two CMP sensors (one per bank), while the IS F’s 5.0‑litre V8 uses multiple sensors to monitor both banks. These sensors are also referenced in the manufacturer’s DTC lists (e.g., P0340/P0345 series) for this model year, confirming they’re integral to engine management.

The camshaft sensor lets the engine control module know exactly where each cam is in its rotation. That live timing data is crucial for sequential fuel injection, spark timing and the dual VVT‑i/VVT‑iE systems that give the IS its smooth idle, crisp throttle response and tidy fuel economy. When the signal from the cam sensor lines up with the crank sensor, the ECM can phase the cams accurately, trim fuelling, and keep emissions in check. If the signal drops out or goes wonky, the ECM may fall back to a safe map, which can mean hard starting, misfires, sluggish performance, or a glowing check‑engine light.

There’s no scheduled replacement for a CMP sensor, it’s a solid‑state part and generally replaced only if faulty. That said, a bit of sensible servicing goes a long way:

• Keep engine oil clean and at the right level — VVT systems rely on oil pressure, and dirty oil can aggravate correlation faults.
• Inspect the sensor connectors and loom under the bonnet for brittle clips, oil intrusion or rubbed wiring, especially near the cylinder heads.
• Diagnose properly: use a scan tool to check for cam/crank correlation codes and live data. An oscilloscope trace is gold if available.
• When replacing, use quality parts, renew the O‑ring, and tighten to the spec in the repair manual. Disconnect the battery, and mind the brittle plastic tabs.
• After fitting, clear codes, perform any required idle learn, and road‑test across a few kilometres to confirm no cam timing faults return.

Where are they? On the V6, look at the top/front of each cylinder head near the timing cover, on the IS F V8, sensors sit at the front of both banks. It’s a straightforward spanner job for many DIYers, but a pro can also confirm timing and rule out stretched chains or VVT gear issues if symptoms persist.

Popular questions

Where is the camshaft sensor on a 2010 Lexus IS?
On the IS 250/350 V6, each bank has a sensor mounted near the front/top of the cylinder head by the timing cover. On the IS F V8, you’ll find multiple sensors at the front of both banks. Access is under the bonnet without removing the engine, some trims or engine covers may need to come off.

What are common symptoms of a failing camshaft sensor on this model?
Expect hard starting, rough idle, hesitant acceleration, increased fuel use, and the check‑engine light with codes like P0340/P0345. Sometimes the car will run but feel flat as the ECM limits cam phasing. Intermittent stalling at low speed can also show up.

Is it safe to drive with a dodgy camshaft sensor?
Short trips to get it diagnosed are usually fine, but ongoing driving isn’t wise. Loss of accurate cam timing can cause poor performance and higher emissions, and it can mask other issues such as VVT or timing chain problems. Sort it sooner rather than later to avoid getting stranded.