Parts for your 2018 Lexus Is-Camshaft sensor

2018 Lexus IS camshaft sensor — what it does and how to look after it

Yes, the 2018 Lexus IS definitely uses camshaft position sensors. Technical sources such as the Lexus IS repair manual and Toyota Electrical Wiring Diagram (EWD) for the model year, along with standard OBD‑II diagnostics (which list CMP‑related DTCs like P0340, P0341, P0345 and P0349), all confirm these sensors are fitted and monitored by the engine control module. The 2.0‑litre turbo 8AR‑FTS uses separate intake and exhaust cam sensors, while the V6 variants (2GR series) use sensors on each bank for both intake and exhaust cams.

The camshaft sensor is the ECM’s timing spotter. It watches the cam’s exact position so the car can fire fuel injectors sequentially, spark at the right moment, and command Variable Valve Timing (VVT) accurately. That’s how the IS nails smooth cold starts, tidy idle, punchy mid‑range and decent fuel economy across Aussie and Kiwi kilometres.

There’s no scheduled replacement interval for the camshaft sensor, it’s a “replace on fault” item. Keeping engine oil fresh is the best preventative care because sludgy oil can upset VVT operation and, in turn, make the sensor’s job harder. Under the bonnet, a quick look at the sensor connectors and loom routing near the cam covers during routine servicing is smart—check for oil wicking into the plug, brittle conduit, or clipped wires.

• Common symptoms: longer cranking, rough idle, flat spots, poor fuel economy, and a Check Engine lamp.
• Typical fault codes: P0340/P0341 (Bank 1), P0345/P0349 (Bank 2) depending on engine.

Replacement is straightforward for a competent DIYer or any workshop. Disconnect the battery, unplug the sensor at the cam cover, remove the retaining bolt, and ease the sensor out. Lightly oil a new O‑ring, seat the new sensor, and torque the bolt to the factory spec (always confirm in the Lexus service manual for the exact engine). Clear codes and perform a short drive so the ECM can relearn cam/crank correlation—usually no programming tool is needed.

• Use genuine or high‑quality aftermarket parts to avoid signal noise dramas.
• If a fault returns quickly, inspect the trigger wheel, wiring continuity and ECM grounds before blaming the new sensor.
• Pair sensor replacement with an oil and filter change if the old oil looks tired—great for VVT health.

Popular questions about the 2018 Lexus IS camshaft sensor

How many camshaft sensors are in a 2018 Lexus IS?
The 2.0L turbo (8AR‑FTS) typically has two—one for the intake cam and one for the exhaust. V6 models (2GR family) usually run four—intake and exhaust on both Bank 1 and Bank 2. Checking the VIN and engine code will confirm the exact count.

Do camshaft sensors need coding after replacement?
Generally, no. After fitting, clear any codes and let the engine idle, then take a short drive so the ECM can relearn synchronisation. If a code persists, look for wiring issues or mechanical timing concerns rather than trying to “program” the sensor.

Can driving with a faulty camshaft sensor cause damage?
It’s unlikely to cause immediate mechanical damage, but drivability suffers and fuel economy tanks. Mis‑timed injection and VVT control can load the catalyst with unburnt fuel, so it’s best to sort it promptly.