Parts for your 2015 Lexus Is-Camshaft sensor

2015 Lexus IS camshaft sensor — fitted, vital, and worth a look at service time

According to Lexus/Toyota service information (TIS) for the 2015 IS range (GSE31/GSE36 for the V6 and AVE30/ASE30 for the hybrid/four-cylinder), a camshaft position sensor is fitted and used by the engine control module. The factory repair manual sections for the SFI/Engine Control systems list DTCs P0340, P0345, P0365 and P0390 for camshaft position sensor circuits, and the Lexus parts catalogue specifies a camshaft position sensor for these engines. So, it’s absolutely relevant on a 2015 Lexus IS.

The camshaft sensor’s job is to tell the ECU exactly where the cam(s) are in their rotation. That signal lets the car run true sequential fuel injection, fire the coils at the right moment, and command Dual VVT-i (and VVT-iW on some variants) with precision. On the V6 models (IS 250/350), there are typically two sensors, one per bank. On the IS 300h/four-cylinder, there are usually sensors monitoring the intake and exhaust cams. Without clean cam timing feedback, the ECU will fall back to a limp strategy, start poorly, and may log the fault codes listed above.

As part of regular servicing, the sensor itself isn’t a scheduled replacement item, but keeping it happy is simple. Owners benefit from timely oil services with the correct Lexus-approved viscosity, because sludgy oil can upset cam timing and confuse signal quality. During routine checks, a quick visual once-over for brittle wiring or oil weeping from the sensor’s O-ring is smart, especially on higher‑kilometre cars or those that see lots of short trips.

Replacement is typically straightforward for a competent technician: disconnect the plug, remove the retaining bolt, ease out the sensor, swap the O-ring, and refit to torque. Aftermarket and genuine options are available, but many workshops prefer OE sensors for stable signal behaviour. When a sensor fault is suspected, technicians should scan for DTCs, verify live data for cam and crank correlation, and rule out wiring faults before fitting parts.

• Common signs: extended crank, rough idle, stalling at lights, flat spots on acceleration, reduced power, and the MIL on.
• Good habits: use quality oil, fix oil leaks promptly, and keep connectors clean and properly clipped.
• Pro tip: if a V6 logs a cam sensor code, check which bank is flagged to avoid swapping the wrong side.

How many camshaft sensors are on a 2015 Lexus IS?

V6 models typically have two camshaft position sensors, one for each bank. The IS 300h/four‑cylinder generally uses two as well, monitoring intake and exhaust camshafts. Exact count and locations can vary by engine code, so workshops confirm by VIN in the Lexus parts catalogue or TIS.

What symptoms point to a bad camshaft sensor on a 2015 IS?

Owners often notice longer cranking, a rough or hunting idle, a sudden drop in power, or intermittent stalling. The check engine light comes on and scan tools commonly show P0340/P0345/P0365/P0390. If left, fuel economy and drivability suffer, and the ECU may limit performance.

Is it safe to keep driving with a faulty camshaft sensor?

The car may still run, but it’s not ideal. The ECU can revert to a backup strategy that compromises timing and power, which isn’t flash for daily use or motorway overtakes. It’s best to diagnose promptly to protect the engine and restore smooth running.