Acura MDX Engine Oil Pressure Switch Guide (2001-2007)
Is your MDX leaking oil or showing a false oil warning light? This guide is for you.
- A leaking switch or a false oil warning light are the most common signs of failure on the 2001-2007 MDX.
- If your oil light comes on, always check the oil level immediately before assuming the switch is bad.
- The 2007 MDX uses a specific oil pressure switch (P/N 37240-RDM-A01); using the wrong part can cause damage.
- This is a simple DIY replacement for most owners, accessible behind the passenger-side front wheel.
Is Your Acura MDX Oil Pressure Switch Failing?
A faulty engine oil pressure switch is a common problem for the first-generation Acura MDX. The two most frequent signs of failure are an active oil leak and a false warning light on your dashboard. Because this part is inexpensive and relatively easy to replace, it's a repair most owners should address quickly.
Top 3 Failure Symptoms
- Oil Leak: The most common failure is an oil leak directly from the switch itself. The internal seals fail, allowing pressurized oil to seep through the plastic sensor body. You may notice drips on the garage floor or see oil residue caked around the oil filter area. 🎬 Watch: Replacing the oil filter adapter gasket and pressure sensor.
- False Warning Light: You might see the red oil can light flicker or stay on, or a "Check Engine Oil Level" message may appear, even when the dipstick shows the oil level is full. 🎬 Watch: How to fix a flickering oil pressure warning light. This is a well-documented issue, especially on 2007 models.
- No Warning Light When There Should Be: In rare cases, the switch can fail 'open' and will not activate the warning light even if there is a real, dangerous drop in oil pressure.
Known Issue: TSB 09-012 and the 2007 MDX
Acura released Technical Service Bulletin (TSB) 09-012 for the 2007-2009 MDX to address false "Check Engine Oil Level" messages. The cause is often a faulty switch combined with sensitive computer software. The fix involves replacing the switch and, in some cases, a dealer software update.
CRITICAL FOR 2007 OWNERS: The 2007 MDX (and some early 2008 models) uses a different oil pump (RDM type) and a specific oil pressure switch (P/N 37240-RDM-A01). This switch has different threads and does NOT use an O-ring; it requires liquid gasket on the threads. Most aftermarket switches are for the newer 'R72' style pump and will not fit correctly. If you have a 2007 MDX, using an OEM switch or an aftermarket part specifically verified for the 'RDM' pump is highly recommended to avoid installation issues.
Choosing the Right Aftermarket Switch
While an OEM switch is a safe bet, several quality aftermarket brands are available. For a simple sensor like this, the main difference is often longevity and quality control.
- Premium Aftermarket (Beck Arnley, Standard Ignition): These brands have a strong reputation for quality. They often source parts from OEM manufacturers and are a reliable choice for a fit and function that rivals the original part.
- Budget Aftermarket (URO Parts, Global Parts, etc.): These brands offer significant cost savings. However, for a part that is constantly under pressure and heat, and whose failure can lead to major engine anxiety, spending a little more for a premium brand is often wise. Forum discussions often show mixed reviews for budget electronic parts.
Pro Tip: Clean the Connector
When you replace the switch, inspect the electrical connector. If it's full of oil from a leaking switch, clean it thoroughly with electrical contact cleaner before plugging it into the new part. An oil-soaked connection can cause poor readings down the road.
Cost of Replacing the Engine Oil Pressure Switch
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Part | $10.64 - $98.22 |
| New OEM Part | $65 - $100 |
| Shop Labor | $75 - $150 |
| Total Professional Replacement | $85 - $250 |
Frequently Asked Questions
Can I drive with a bad oil pressure switch?
If your oil light is on, the first step is ALWAYS to stop the car safely and check the oil level. If the level is normal, you are likely dealing with a faulty switch. You can drive cautiously for a short time, but you have lost your only warning system for a real oil pressure problem. It is strongly recommended to replace the switch as soon as possible.
Is this a DIY-friendly repair?
Yes, for most home mechanics this is a straightforward job. It is easily accessible by removing the passenger-side front wheel. It requires basic tools and can be completed in under an hour.
Where is the oil pressure switch located on the 2001-2007 MDX?
It is screwed into the oil filter housing, which is located on the front of the engine, near the passenger side. You can see it clearly after removing the passenger-side front wheel and the plastic splash shield.
Do I need a special tool to replace it?
You will need a 24mm deep socket or wrench. A special oil pressure switch socket can make it easier, but it is not strictly required.
Why does my 2007 MDX need a different switch?
Acura used a different oil pump design (RDM-type) for the 2007 model year and some early 2008s. This pump requires a switch with unique threads (OEM part # 37240-RDM-A01). Using the wrong switch can damage the threads on the oil pump housing, leading to a much more expensive repair. 🎬 See this replacement walkthrough for 2007-2013 MDX models. Always verify the part fitment for your specific year.
Helpful Videos
Technical Specifications
OEM Part Numbers: 37240-RDM-A01 (Required for 2007 & early 2008 models) 37240-P8E-A01 37240-R72-A01 (For later, incompatible models)
Location: Oil Filter Housing. Connector: 1-Pin. Wrench Size: 24mm.
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.
- Acura MDX:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Acura MDX Oil Pressure Switch Failing?
- Top 3 Failure Symptoms
- Known Issue: TSB 09-012 and the 2007 MDX
- Choosing the Right Aftermarket Switch
- Pro Tip: Clean the Connector
- Cost of Replacing the Engine Oil Pressure Switch
- Frequently Asked Questions
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