Infiniti EX35 (2008-2012) Engine Oil Pressure Switch: A Comprehensive Guide
Understanding the signs of a failing oil pressure switch can save your EX35's engine from serious damage.
- A faulty oil pressure switch can cause a false warning light or a physical oil leak near the filter.
- Always check the oil level first when the warning light comes on; never drive with a confirmed low oil pressure issue.
- Replacement is a simple DIY task for those comfortable working under their vehicle.
- Choose a reputable aftermarket brand like Standard Ignition or Beck Arnley for a reliable, cost-effective repair.
Is Your EX35's Oil Light On? It Might Be This Switch.
If you own a 2008-2012 Infiniti EX35, a flickering or constantly lit oil pressure light can be alarming. While it can indicate a serious low oil pressure problem, it is often caused by a failure of the oil pressure switch itself. This component is known to fail in two primary ways: it can stop sending accurate signals, or it can develop an oil leak. Understanding these failure modes is key to a correct diagnosis.
Don't Ignore the Oil Light
Never assume the oil light is just a faulty sensor. Always check your engine oil level immediately. If the level is low, top it off. If the light remains on, or if the engine is making unusual noises like ticking or knocking, shut it off and have the vehicle towed. Driving with low oil pressure can destroy your engine in minutes.
Common Failure Symptoms
Here are the most common signs that your EX35's oil pressure switch needs to be replaced:
- Oil Warning Light On or Flickering: The most obvious symptom is the red oil pressure light on your dashboard illuminating, either steadily or intermittently. A faulty switch can send a false signal, triggering the light even when the oil pressure is perfectly fine.
- Oil Leak: The switch is constructed from metal and plastic components pressed together. Over time, the seal between these materials can fail, causing engine oil to leak. This leak is often found near the oil filter and can be mistaken for a leaking oil filter or a more complex oil cooler gasket leak. You might notice oil spots on your garage floor or a burning oil smell if it drips onto hot exhaust components.
- Check Engine Light: In some cases, a failing oil pressure switch can trigger the Check Engine Light. Diagnostic trouble codes (DTCs) such as P0520, P0521, P0522, or P0523 may be stored in the vehicle's computer.
Choosing the Right Aftermarket Part
For the 2008-2012 EX35, the OEM oil pressure switch is reliable, but high-quality aftermarket options offer excellent value. Since this is a critical sensor, it's best to stick with reputable brands rather than the cheapest available option.
Tier 1: OE-Equivalent Brands
- Standard Ignition (SMP): A well-respected manufacturer known for producing high-quality sensors that meet or exceed original specifications. They are a trusted choice for reliability.
- Beck Arnley: This brand specializes in parts for foreign nameplate vehicles and has a reputation for often sourcing parts from the original equipment manufacturers, ensuring a proper fit and function.
Tier 2: Reputable Aftermarket Brands
- Facet: An established European brand that produces a wide range of sensors and is known for quality manufacturing.
- Vemo: A German brand offering a broad catalog of electrical parts, often at a competitive price point.
Pro Tip: When replacing the switch, especially if it was leaking, it's a good idea to also clean the electrical connector with a dedicated electronics cleaner to ensure a good connection.
Cost of Replacement
| Item | Estimated Cost |
|---|---|
| New Aftermarket Oil Pressure Switch | $15 - $41 |
| Shop Labor | $95 - $150 |
| DIY Total | $15 - $41 |
| Shop Total (Estimated) | $110 - $191 |
Frequently Asked Questions (FAQ)
Where is the oil pressure switch located on the 2008-2012 EX35?
The oil pressure switch is located on the engine block, right next to the oil filter. You will need to raise the vehicle and remove the lower engine splash shield to access it.
Can I replace the EX35 oil pressure switch myself?
Yes, this is a very DIY-friendly job for those with basic mechanical skills. It requires safely jacking up the vehicle, removing the splash shield, unplugging the sensor, and unscrewing it with a deep socket. You can expect a small amount of oil to spill, so have a drain pan ready.
What tools are needed for the replacement?
You will need a jack and jack stands, a socket set with a deep socket (the size may vary, often 22mm, 27mm, or 1 1/16"), a drain pan, and rags. Applying thread sealant or using a part that comes with it is recommended.
Are there any recalls for the oil pressure switch on the EX35?
No, there are no official recalls or Technical Service Bulletins (TSBs) from Infiniti specifically for a faulty oil pressure switch on the 2008-2012 EX35. However, leaking switches are a commonly reported issue in owner forums.
Technical Specifications
OEM Part Numbers: 25240-4M40E
Location: Engine block, adjacent to the oil filter. Activation Type: Switch (On/Off). Common Tools: Deep socket (size varies, e.g., 22mm, 27mm, 1 1/16").
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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.
- INFINITI EX35: