2001-2005 Lexus IS300 Automatic Transmission Input Shaft Speed Sensor Guide
Fix erratic shifting and clear check engine light code P0715 on your first-generation IS300.
- A failing input speed sensor is the most common cause of code P0715 and erratic shifting on the IS300.
- The sensor is located externally on the transmission and is a straightforward DIY replacement for many owners.
- Using a high-quality aftermarket brand like NGK (NTK) is a reliable alternative to the more expensive OEM part.
- Do not ignore symptoms, as driving with a bad sensor can be unsafe and put extra strain on your transmission.
Is Your IS300 Shifting Strangely? It Could Be a Bad Input Speed Sensor
If your Lexus IS300 has started shifting harshly, getting stuck in gear, or the check engine light is on, a faulty automatic transmission input shaft speed sensor could be the culprit. This sensor is a critical part of what makes your transmission shift smoothly. When it fails, the transmission's computer gets confusing information, leading to poor performance.
Common Symptoms of a Failing Input Speed Sensor:
- Check Engine Light: The most common sign is a check engine light with the code P0715.
- Harsh or Erratic Shifting: You may feel a jolt or clunk when the transmission changes gears.
- Limp Mode: The transmission may get stuck in a single gear (often 2nd or 3rd) to prevent damage. This limits your speed.
- E-Shift Not Working: The manual shifting buttons on the steering wheel may stop responding.
- Delayed Engagement: A noticeable delay when shifting from Park into Drive or Reverse.
- Stalling: In some cases, the engine may bog down or stall when coming to a stop or shifting.
Choosing the Right Aftermarket Sensor for Your IS300
When replacing this sensor, you have a choice between Original Equipment (OEM) from a Lexus dealer and aftermarket parts. For a critical electronic part like this, quality matters.
- OEM (Original Equipment Manufacturer): This is the exact part your car was built with. It guarantees perfect fit and function but is the most expensive option. The OEM part number for the IS300 is 89413-24010.
- Premium Aftermarket (NGK/NTK): NGK, which sells sensors under the NTK brand, is a highly respected company that supplies original parts to many car manufacturers. Their parts are known for high quality and reliability, often matching OEM performance at a lower cost. This is a strong choice for IS300 owners.
- Standard Aftermarket (Standard Ignition): Standard Motor Products (SMP) is a large aftermarket brand offering a wide range of sensors. They provide a functional replacement at a more budget-friendly price point, suitable for drivers looking for a cost-effective repair.
Pro Tip: While very cheap, unbranded sensors are available online, they are a gamble. Using a reputable aftermarket brand like NGK or Standard Ignition provides better peace of mind and reduces the risk of having to do the job twice.
Cost of Replacing the Input Shaft Speed Sensor
The total cost will depend on the part you choose and whether you do the work yourself or hire a mechanic. The replacement is relatively simple for those with DIY experience.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Part | $220 - $300 |
| New Aftermarket Part | $68 - $207 |
| Shop Labor | $90 - $150 |
| Total Professional Repair | $158 - $457 |
Frequently Asked Questions
Where is the input shaft speed sensor located on the IS300?
The input shaft speed sensor (sometimes called the O/D direct clutch speed sensor) is located on the exterior of the A650E automatic transmission case. It is held in place by a single 10mm bolt, making it accessible from underneath the vehicle for replacement.
What is the main trouble code for a bad input speed sensor?
The primary diagnostic trouble code (DTC) associated with this sensor is P0715, which means "Input/Turbine Speed Sensor 'A' Circuit Malfunction". If you have this code, the sensor is the most likely cause of the problem.
Are there any recalls for this part on the 2001-2005 IS300?
No, there are no specific recalls from Lexus or the National Highway Traffic Safety Administration (NHTSA) for the automatic transmission input shaft speed sensor on the 2001-2005 IS300.
Is this the same as a wheel speed sensor or ABS sensor?
No. The input shaft speed sensor is located on the transmission and helps control shifting. A wheel speed sensor, also called an ABS sensor, is located at each wheel and is used for the anti-lock braking system (ABS) and traction control.
Technical Specifications
OEM Part Numbers: 89413-24010 89413-08020
2-pin connector, inductive sensor, single bolt mount.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus IS300: