A Guide to the 2012-2018 Audi A6 Engine Oil Pressure Switch
That dashboard warning light might not be what you think; here's how to diagnose the issue and choose the right part for your A6.
- A red oil pressure warning is critical. Always stop the engine immediately to prevent potential damage.
- Before replacing the switch, investigate TSB 2041093/4, as a faulty plug in the oil filter housing can cause the same warning.
- Your A6 has two pressure switches (low and high pressure); diagnose which has failed, or replace them as a pair on higher mileage cars.
- For reliability, choose an aftermarket brand that is also an OEM supplier for Audi, such as Hella or Vemo.
Is Your Audi A6 Oil Pressure Switch Failing?
A faulty oil pressure switch is a common issue, but the symptoms can be alarming. Because the warning it triggers is the same one used for genuine, severe low oil pressure, you must treat it seriously every time. Ignoring it can lead to complete engine failure.
Key Symptoms of a Bad Switch
- Red Oil Pressure Warning Light: The most common sign is the red "oil can" symbol appearing on your instrument cluster. This may be accompanied by a "Shut off engine and check oil level" message.
- Intermittent Warnings: The light may flicker or come on randomly, especially at idle, and then go away.
- RPM Limitation Warning: In some cases, you may see a message telling you not to exceed a certain RPM, like 2500 RPM, as the car enters a protective limp mode.
- Check Engine Light with Codes: A diagnostic scan may reveal fault codes such as P164D (Oil pressure switch for reduced oil pressure malfunction) or P0524 (Engine Oil Pressure Too Low).
Important TSB for A6 Owners
Before you replace the switch, be aware of Audi's Technical Service Bulletin (TSB) 2041093/4. This bulletin notes that the P164D fault code and oil pressure warnings are often caused by a small rubber plug and spring inside the oil filter housing losing tension, not by a faulty switch. This is a common issue and should be investigated before or during the replacement of the switch itself, especially if the warnings appeared after an oil change.
Choosing the Right Aftermarket Oil Pressure Switch
For a critical sensor like this on a German vehicle, part quality matters. While an OEM part from a dealer is always an option, several aftermarket brands manufacture the original parts for Audi. Choosing one of these brands gives you the same quality without the dealership markup.
Brand Quality Tiers
- Top Tier (OEM Supplier): Brands like Hella, Vemo, and CRP are often the original equipment manufacturers for Audi. These parts are expected to offer the best fit, performance, and longevity, making them a highly recommended choice.
- Mid Tier (Reputable Aftermarket): Standard Ignition (SMP), Beck Arnley, and Walker Products are well-known aftermarket brands with a reputation for reliable sensors. They are a solid choice if an OEM supplier is not available.
- Economy Tier (Use with Caution): Brands like URO Parts and other lower-cost options can be inconsistent in quality. While they may work, they have a higher risk of premature failure. Given the critical function of this part and the low cost of higher-quality options, it's wise to invest in a better brand.
Pro Tip: Your A6 has two different pressure switches, often color-coded brown and blue (or purple for an updated 3.0T part). The brown switch is typically for reduced/low pressure, while the blue is for the main/high-pressure stage. It's wise to identify which one has failed via diagnostic codes, but replacing them in pairs is good practice if your vehicle has high mileage.
How Much Does an Audi A6 Oil Pressure Switch Replacement Cost?
The cost to replace an oil pressure switch is relatively low, but it's crucial not to delay the repair. The table below shows the estimated cost breakdown. Labor costs can vary based on which engine your A6 has (2.0T vs. 3.0T), as the switch locations differ in accessibility.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Part | $9 - $51 |
| Shop Labor | $61 - $140 |
| Total Estimated Cost | $70 - $191 |
Frequently Asked Questions
Can I drive my Audi A6 with the oil pressure light on?
No. You should pull over safely and shut off the engine as soon as possible. Even if it's just a faulty sensor, the warning is identical to one for genuine low oil pressure, which can destroy your engine in minutes.
Where is the oil pressure switch located on a 2012-2018 Audi A6?
The switches are located on or near the oil filter housing. On the 2.0T engine, they are typically found near the serpentine belt tensioner, just below the oil filter. On the 3.0T supercharged engine, one switch is in the "V" of the engine under the supercharger, and the other is on the oil filter housing, which can be difficult to access.
Can I replace the oil pressure switch myself?
Yes, this is a DIY-feasible job for someone with basic mechanical skills and tools, including a 24mm deep socket. However, on the 3.0T engine, accessing the switches can be challenging and may require removing other components. Always confirm the actual oil pressure with a mechanical gauge if you have any doubt about the engine's health.
Is a flickering oil light always a bad switch?
Not always. While a faulty switch is a common cause, a flickering light can also indicate a genuinely low oil level, the wrong viscosity oil, a failing oil pump, or the known TSB issue with the oil filter housing plug. Always check your oil level first and have the system properly diagnosed.
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Technical Specifications
OEM Part Numbers: 038919081K 038919081P 06L919081 06K919081
The 2012-2018 Audi A6 uses a two-stage oil pressure system with two separate switches. One is a low-pressure switch (approx. 0.7 bar) and the other is a high-pressure switch (approx. 2.0-2.5 bar). They are often color-coded brown (low) and blue (high). A 24mm deep socket is typically required for removal and installation.
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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.
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- Is Your Audi A6 Oil Pressure Switch Failing?
- Key Symptoms of a Bad Switch
- Important TSB for A6 Owners
- Choosing the Right Aftermarket Oil Pressure Switch
- Brand Quality Tiers
- How Much Does an Audi A6 Oil Pressure Switch Replacement Cost?
- Frequently Asked Questions
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