Lexus RC F (2015-2024) Engine Coolant Temperature Sensor Guide

Is Your RC F's Engine Coolant Temp Sensor Failing?

A faulty Engine Coolant Temperature (ECT) sensor can cause a range of confusing issues. Because the sensor's reading affects so many engine functions, symptoms can seem unrelated. The most common sign is a Check Engine Light on your dashboard. Other indicators include an inaccurate temperature gauge (reading either completely cold or maxed out hot), poor fuel mileage, black smoke from the exhaust, a rough idle, and engine overheating in traffic.

Choosing the Right Aftermarket Sensor for Your RC F

For a precision vehicle like the Lexus RC F, part quality matters. Aftermarket sensors for this car fall into a few quality tiers. Choosing the right one depends on your budget and how closely you want to stick to the original factory performance.

Tier 1: OEM & OEM-Equivalent Brands

• Denso: Denso is the original equipment manufacturer (OEM) for many of Toyota and Lexus's electronic parts. An aftermarket Denso sensor is widely considered to be identical to the part you would get from a Lexus dealership, just in a different box and at a lower price. For guaranteed fit and performance, Denso is the top recommendation.
• NGK/NTK: While more famous for spark plugs and oxygen sensors, NTK is another top-tier Japanese electronics manufacturer that produces high-quality sensors.

Tier 2: Reputable Aftermarket Brands

• Delphi: A well-known brand that produces reliable parts. While some of their non-original parts have shifted manufacturing locations, they are generally a solid choice with good quality control.
• Beck Arnley: This brand specializes in sourcing parts that match the original's form and function, often by repackaging parts from the OEM supplier. Quality is generally good, though it can vary depending on their source for a specific part.
• Standard Ignition (SMP): A long-standing aftermarket brand offering a wide range of sensors.

Tier 3: Value Brands

• URO Parts, Motorad, Facet, Holstein, Global Parts: These brands offer a more budget-friendly option. They can provide a functional replacement to get your car back on the road, but may not offer the same longevity or precise calibration as the higher-tier brands.

Known Issues, Recalls, or TSBs

Searches of the National Highway Traffic Safety Administration (NHTSA) database and technical service bulletins (TSBs) did not reveal any specific recalls or service campaigns for the engine coolant temperature sensor on the 2015-2024 Lexus RC F. While a common coolant leak known as the "valley plate leak" exists for the 2UR-GSE engine, it is a separate mechanical issue unrelated to sensor failure.

Installation Snapshot

Replacing the ECT sensor on the RC F's 5.0L V8 is a moderately difficult job due to tight access. The sensor is typically located on the back of the engine, near the firewall, underneath the intake assembly.

• Access: You will likely need to remove the engine covers, air intake snorkel, and possibly the battery to create enough room to work.
• Tools: A 19mm deep socket with extensions and a swivel joint is usually required to reach and remove the sensor.
• Coolant Loss: Be prepared for some coolant to spill when the old sensor is removed. Work quickly to install the new sensor to minimize the mess and the amount of air that enters the cooling system. Have the new part ready to go.

Due to the tight quarters, this job may be challenging for a novice DIYer. A professional mechanic can typically complete the replacement in about an hour.

Cost Comparison for Lexus RC F ECT Sensor

Frequently Asked Questions