Parts for your 2017 Lexus Is-Camshaft sensor

2017 Lexus IS Camshaft Sensor — What it does and how to look after it

Yes, the 2017 Lexus IS uses a camshaft position sensor (often two, depending on engine). This is confirmed by Lexus/Toyota technical sources: the Repair Manual for the 2017 IS lists diagnostic trouble codes such as P0340/P0345 for the camshaft position sensor circuit, the Electrical Wiring Diagram shows “CAM” signals feeding the ECM, and the Electronic Parts Catalogue for model codes like ASE30/GSE31/GSE37 includes “Sensor, Cam Position”. That all makes the camshaft sensor absolutely relevant to this model.

On the 8AR‑FTS 2.0‑litre turbo four, there are typically sensors for the intake and exhaust cams. On the V6 (2GR series), there’s a sensor on each bank. Their job is to report cam angle so the ECM can sync fuel injection and spark and command VVT‑i cam timing. Without accurate cam feedback, the engine can be hard to start, run rough, use more fuel and throw a warning lamp.

These sensors aren’t a regular replacement item, but they do sit at the front of the head where heat, oil mist and vibration live. Good servicing practice on a 2017 IS is to keep an eye on:

• Wiring and plugs near the cam cover for brittle insulation, oil intrusion or loose pins.
• O‑ring weeping around the sensor body (light oil film is common, active leaks aren’t).
• Related fault codes: P0340/P0345/P0390, cam/crank correlation codes like P0016–P0019, extended crank and uneven idle.

If replacement is needed, it’s a straightforward job for a competent tech. Genuine or high‑quality Denso‑type parts are recommended, and the small mounting bolt is only lightly torqued (around 8–10 N·m, follow the Lexus spec). A light smear of clean engine oil on the new O‑ring helps the sensor seat without nicking the seal.

1. Disconnect the battery and remove the engine cover.
2. Unplug the sensor, remove the retaining bolt and withdraw the sensor squarely.
3. Check the bore for debris, install the new sensor and torque the bolt correctly.
4. Reconnect, clear codes and road‑test. The ECM will relearn cam timing on its own.

Worth noting: many cam sensor faults trace back to damaged loom sections or oil contamination in the connector, so a careful diagnosis saves money. If left unresolved, mis‑sync can lead to misfires and catalyst stress, so it’s best sorted promptly.

Popular questions

Where is the camshaft sensor on a 2017 Lexus IS?
Location varies by engine. On the 2.0‑litre 8AR‑FTS, the sensors sit at the front of the cylinder head near the cam sprockets (intake and exhaust). On the 2GR V6, there’s one on each bank, typically at the front near the cam covers. Access usually requires popping off the engine cover.

How many cam sensors does a 2017 Lexus IS have?
The 2.0‑litre turbo generally uses two (intake and exhaust). The V6 uses two as well, one per bank (Bank 1 and Bank 2). The ECM relies on these alongside the crank sensor to manage VVT‑i, injection and ignition timing.

Is it safe to drive with a bad camshaft sensor?
The engine may still run, but it can be hard to start, stumble, and use more fuel. Prolonged driving can cause misfires and over‑fueling that may stress the catalytic converters. It’s best to have it diagnosed and repaired sooner rather than later.