Guide to the 2015 INFINITI Q40 Engine Oil Pressure Switch
Understanding the signs of a failing oil pressure switch can save your Q40's engine from serious damage.
- The 2015 Q40 uses an oil pressure 'switch', not a 'sensor'; it only triggers a warning light at very low pressure (under 5 PSI).
- A flickering or constant oil light is the main symptom, but always verify the actual oil pressure with a mechanical gauge before assuming the switch is the only problem.
- The switch is located next to the oil filter, making it a straightforward DIY replacement for many owners.
- Quality aftermarket brands like Beck Arnley and Standard Ignition are reliable and cost-effective alternatives to the OEM part.
Is Your Q40's Oil Light On? Understanding the Cause
The 2015 INFINITI Q40, which is mechanically similar to the G37, relies on its engine oil pressure switch to alert you to potentially dangerous low oil pressure situations. While the first thought might be a major engine problem, it's often the switch itself that has failed. A faulty switch can cause the oil light to flicker or stay on, even when the oil level and pressure are perfectly fine. Conversely, a switch that fails to activate won't warn you of a real problem. It's a small part, but its role is vital.
Don't Ignore the Warning Light
Never assume the oil light is just a faulty switch. Always check your oil level immediately. If the level is correct, it's best to have the actual oil pressure tested with a mechanical gauge 🎬 Watch how to perform a manual oil pressure test. to rule out serious internal engine issues before replacing the switch.
Symptoms of a Failing Oil Pressure Switch
- Flickering Oil Light: The oil pressure light on the dash may flicker, especially at idle or during turns. This can happen if the switch is failing or if a wire is intermittently grounding out.
- Oil Warning Light Stays On: If the oil level is full and the engine sounds normal, but the red oil light won't turn off, the switch is a likely culprit.
- Visible Oil Leak: The switch itself can develop leaks over time. You may see oil seeping from the sensor body or its electrical connector, which is a definite sign it needs replacement.
Choosing the Right Aftermarket Part for Your Q40
For a part like an oil pressure switch, a quality aftermarket brand can be a smart, cost-effective choice compared to the OEM part from an INFINITI dealer. The key is to select a reputable manufacturer.
- OEM-Equivalent Brands (e.g., Beck Arnley): Brands like Beck Arnley specialize in parts for foreign nameplates and aim to match the original's fit, form, and function. They are generally considered a reliable option for INFINITI vehicles.
- Reputable Aftermarket Brands (e.g., Standard Ignition, Vemo, Facet): These are well-known companies that produce a wide range of automotive components. Their quality is typically good and offers a dependable repair without the OEM price tag.
The 2015 Q40 uses the same oil pressure switch as many other Nissan and INFINITI vehicles with the VQ series engine, making quality aftermarket parts widely available. The OEM part number is 25240-4M40E, which replaces the older 25240-4M400.
Cost of Replacing the 2015 INFINITI Q40 Oil Pressure Switch
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Switch | $14 - $41 |
| New OEM Switch | $27 - $39 |
| Shop Labor | $61 - $90 |
| Total Professional Replacement | $98 - $126 |
Frequently Asked Questions (FAQ)
Where is the oil pressure switch located on the 2015 INFINITI Q40?
The oil pressure switch is located on the engine block, right next to the oil filter. This makes it relatively accessible during an oil change, especially on rear-wheel-drive (RWD) models.
Can I replace the oil pressure switch myself?
Yes, this is a feasible DIY job for someone with basic tools. 🎬 See how to replace the switch using basic hand tools. You will need to safely raise the vehicle, locate the switch near the oil filter, disconnect the electrical connector, and use a deep socket (often 27mm for the original part) to unscrew it. Be prepared for some oil to spill out.
Is an aftermarket oil pressure switch reliable?
Yes, reputable aftermarket brands like Beck Arnley and Standard Ignition offer reliable switches that meet or exceed OEM specifications for fit and function. For a simple switch, they provide excellent value.
What does the code P0520 mean?
P0520 indicates a malfunction in the engine oil pressure sensor/switch circuit. This means the vehicle's computer has detected a problem with the signal from the switch. 🎬 Learn more about diagnosing the P0520 error code. It could be a bad switch, a wiring issue, or an actual oil pressure problem.
Are there any recalls for the Q40 oil pressure switch?
No, there are currently no recalls from INFINITI or NHTSA related to the engine oil pressure switch for the 2015 INFINITI Q40.
Helpful Videos
Technical Specifications
OEM Part Numbers: 25240-4M40E 25240-4M400
Thread Type: 1/8" BSPT (British Standard Pipe Taper) Connector: 1-Pin Blade
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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 Q40:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Q40's Oil Light On? Understanding the Cause
- Don't Ignore the Warning Light
- Symptoms of a Failing Oil Pressure Switch
- Choosing the Right Aftermarket Part for Your Q40
- Cost of Replacing the 2015 INFINITI Q40 Oil Pressure Switch
- Frequently Asked Questions (FAQ)
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