Your Guide to the 2003-2012 INFINITI FX35 Engine Oil Pressure Switch
Understanding the signs of a failing oil pressure switch can save you from unnecessary worry and costly diagnostic fees.
- A flickering oil light or a leak near the oil filter are the top signs of a failing switch.
- This is a simple, low-cost repair that is very feasible for a DIY mechanic.
- Do not use thread sealant on the new switch, as it needs a metal-to-metal ground connection.
- If you have a P0524 code, always verify actual oil pressure with a mechanical gauge before assuming the switch is the only problem.
Is Your FX35 Oil Pressure Switch Failing?
A bad oil pressure switch can cause symptoms that make you think your engine is in serious trouble. Fortunately, the switch itself is a common failure point and is much easier and cheaper to fix than the problem it's designed to detect. Knowing the signs of a bad switch can help you diagnose the issue correctly.
Key Symptoms of a Bad Oil Pressure Switch
- Flickering or Steady Oil Light: The most common symptom is the red oil pressure warning light on your instrument cluster flickering or staying on, even when the engine oil level is correct. This can happen intermittently at first and become more constant as the switch fails completely.
- Oil Leaks: A very common failure on the FX35 is for the switch itself to leak oil. The seal between the plastic electrical connector and the metal body of the switch can fail, causing oil to seep out. You might notice a small puddle of oil on the ground or see oil residue on the engine's splash shield.
A Note on the P0524 Trouble Code
If your Check Engine Light is on, you might have a P0524 "Engine Oil Pressure Too Low" code. While this code can be caused by a faulty switch, it can also indicate a genuine, critical loss of oil pressure. If you see this code, it is vital to stop driving and have your engine's oil pressure checked with a mechanical gauge to rule out a serious internal engine problem.
🎬 See how to diagnose and fix P0524 engine codesChoosing a New Aftermarket Oil Pressure Switch
For a simple component like an oil pressure switch, an aftermarket part is often a practical and budget-friendly choice. The technology is not complex, and many aftermarket brands produce reliable replacements. The OEM part for your FX35 is used on dozens of other Nissan and INFINITI models, so it is a high-volume part with many aftermarket options.
- Tier 1 (OEM Equivalent): Brands like Standard Ignition (SMP) and Beck Arnley have a long history of providing parts that meet or exceed original specifications. While Beck Arnley was once known for re-boxing genuine OEM parts, this is less common today, but their quality is generally considered reliable for this type of component.
- Tier 2 (Value-Oriented): Other brands like Facet, Vemo, and Walker Products offer functional replacements at a lower price point. For a simple switch, these can be a good value, though they may not have the same long-term durability reputation as the top-tier brands.
Ultimately, for this repair, even a value-priced aftermarket switch is a reasonable choice given the low cost and ease of replacement. The difference in price between a budget and premium aftermarket brand is minimal, so choosing a brand like Standard Ignition or Beck Arnley is a good investment for peace of mind.
Cost of Replacing Your FX35 Oil Pressure Switch
This is an inexpensive repair, especially if you do it yourself. The main cost for a professional repair will be labor.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Part | $15 - $41 |
| New OEM Part | $25 - $85 |
| Shop Labor | $60 - $120 |
| Total Professional Repair | $75 - $205 |
A dealer may quote significantly more. One owner reported being quoted $259 for this repair.
Installation Tips
Replacing the oil pressure switch on a 2003-2012 FX35 is a straightforward job for a DIYer. The switch is located on the driver's side of the engine, right next to the oil filter.
🎬 Watch: FX35 oil pressure switch location and replacement walkthrough- Safely raise the front of the vehicle.
- Remove the plastic engine splash shield.
- Locate the switch next to the oil filter. You will see a single wire and electrical connector attached to it.
- Press the tab on the connector to remove it.
- Using a deep 1 1/16" (or 27mm) socket, unscrew the old switch. Be prepared for a small amount of oil to drip out.
- Screw in the new switch by hand first to avoid cross-threading, then tighten it snugly with the socket. Do not overtighten.
- Reconnect the electrical connector, replace the splash shield, and lower the vehicle.
Do not use Teflon tape or thread sealant. The switch uses tapered threads (BSPT) which create a mechanical seal. Sealant can interfere with this seal and prevent the switch from making a proper ground connection.
🎬 Watch: Step-by-step oil pressure switch replacement for Nissan and InfinitiFrequently Asked Questions
Where is the oil pressure switch on the FX35?
It is located on the driver's side of the engine, screwed into the upper oil pan, right next to the oil filter.
Is it safe to drive with a bad oil pressure switch?
It is not recommended. While the vehicle will run, a faulty switch means you have no reliable way of knowing if your engine has a real, catastrophic low oil pressure problem. If the light is on, you should always assume the worst and check your oil level immediately.
My oil level is full, but the oil light is on. Is it the switch?
If your oil level is correct, the most likely culprits are a faulty oil pressure switch or, less commonly, a failing oil pump or clogged oil passages. The switch is the most common and cheapest part to fail, making it the best place to start your diagnosis.
Was there a recall for the oil pressure switch on the FX35?
No, there have been no recalls specifically for the oil pressure switch. There was a recall (NHTSA Campaign ID: 11V592000) for some 2011 FX models for an engine oil cooler bolt that could break and cause a major oil leak, but this did not involve the switch itself.
Helpful Videos
Technical Specifications
OEM Part Numbers: 25240-4M40E 25240-4M400
Required Tool: Deep 1 1/16" (27mm) socket. Thread Type: British Standard Pipe Taper (BSPT).
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.
- INFINITI FX35:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your FX35 Oil Pressure Switch Failing?
- Key Symptoms of a Bad Oil Pressure Switch
- A Note on the P0524 Trouble Code
- Choosing a New Aftermarket Oil Pressure Switch
- Cost of Replacing Your FX35 Oil Pressure Switch
- Installation Tips
- Frequently Asked Questions
- 🎟️ Get 5% Off