Engine Camshaft Position Sensor Failure on the 2010-2012 Lexus HS250h
Understand the symptoms of a failing camshaft sensor in your HS250h and learn how to choose the right replacement part.
- Your 2010-2012 HS250h has two identical camshaft position sensors; consider replacing both at the same time.
- Common symptoms of failure are a check engine light (P0340 codes), rough idle, hard starting, and engine stalling.
- For reliability, choose an OEM-quality brand like Denso, which is the original manufacturer for Lexus.
- This is a simple, 1-bolt replacement that is very feasible for a DIY mechanic and takes less than 30 minutes.
Is Your Lexus HS250h Running Rough?
A failing camshaft position sensor can cause a range of noticeable engine problems. Because this sensor is vital for engine timing, a bad signal can make your car difficult to drive. The most common signs include a rough idle, difficulty starting the engine, a sudden loss of power while accelerating, and engine stalling. You will almost certainly see the Check Engine Light on your dashboard.
Don't Ignore the Signs
While you might be able to drive with a failing sensor, it's not recommended. The engine could stall at any time, which is dangerous in traffic. Continuing to drive can also lead to poor fuel economy and potentially damage other components like the catalytic converter over time.
Choosing the Right Aftermarket Sensor
When it comes to electronic sensors for a Lexus, quality matters. While budget-friendly options are available, forum discussions and mechanic recommendations strongly suggest using an OEM-quality part to avoid replacing it again soon. For the HS250h, the original part is made by Denso.
Brand Quality Tiers
- Tier 1: OEM / OE Supplier (Recommended)
These brands are either the original manufacturer for Lexus or have a reputation for matching OEM quality. They are the most reliable choice.
Brands: Denso, NGK/NTK, Delphi - Tier 2: Quality Aftermarket
These brands are well-regarded in the aftermarket and offer a good balance of price and quality. They are a solid choice if an OE supplier part is not available.
Brands: Beck Arnley, Standard Ignition (SMP) - Tier 3: Economy Brands
These parts are the most affordable but may have a higher risk of premature failure or inconsistent performance with sensitive electronics. They can be an option for a budget repair, but be aware of the potential trade-offs.
Brands: Dorman, URO Parts, Holstein, Motorad, Global Parts, True Tech
Pro Tip: Buy the OEM Brand
Choosing Denso is your best bet. It is the original equipment manufacturer for Toyota and Lexus, so you are getting the exact same quality as the dealer part without the dealer markup.
How Many Sensors Do I Need?
The 2010-2012 Lexus HS250h has two camshaft position sensors. One is for the intake camshaft and the other is for the exhaust camshaft. They are identical parts. If one has failed, it is often a good idea to replace both at the same time, as they are the same age and have been exposed to the same conditions.
Known Issues, Recalls, and Service Bulletins
Searches of the National Highway Traffic Safety Administration (NHTSA) database show several recalls for the 2010-2012 HS250h, related to the hybrid transaxle, rear suspension, and ABS system. However, there are no recalls for the engine camshaft position sensor. A Technical Service Bulletin (TSB) was issued for some 2010 models with the 2AZ-FXE engine for excessive oil consumption, which could lead to engine sludge that may affect sensor performance over time.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Sensor (per sensor) | $27.12 - $73.92 |
| New OEM Sensor (per sensor) | $100 - $150 |
| Shop Labor | $75 - $150 |
| Total Professional Replacement (1 Sensor) | $127 - $224 (Aftermarket) / $175 - $300 (OEM) |
Frequently Asked Questions
Where are the camshaft position sensors located?
The two sensors are located on the top of the engine's valve cover, near the timing chain cover on the passenger side of the engine. Each is held in place by a single 10mm bolt, making them very easy to access.
Can I replace this part myself?
Yes, this is a great DIY job for beginners. You only need a basic socket set to remove the single bolt holding the sensor. The process involves unplugging the electrical connector, unbolting the old sensor, and installing the new one. The entire job for one sensor should take less than 30 minutes.
What happens if I ignore a bad sensor?
Ignoring the problem can leave you stranded if the engine stalls and won't restart. It also causes the engine to run inefficiently, wasting gas and putting extra strain on other components. In some cases, unburned fuel can damage the catalytic converter, which is a very expensive repair.
Should I replace one or both sensors?
The diagnostic trouble code (e.g., P0340) may point to a specific sensor (Bank 1 or Bank 2). However, since both sensors are the same age, it's good preventative maintenance to replace them as a pair. If you are paying for labor, replacing both at once will save you money in the long run.
Technical Specifications
OEM Part Numbers: 90919-05060 90919-T5005 90919-C5001
The 2.4L 2AZ-FXE engine in the HS250h requires two camshaft position sensors. They are identical parts and can be used for either the intake or exhaust camshaft.
We Have This Part in Stock
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 HS250h: