BMW 550i (2006-2016) Ambient Air Temperature Sensor: A Complete Guide
Is an incorrect temperature on your dash causing A/C problems? Here’s what you need to know about replacing your ambient air temperature sensor.
- A faulty ambient air temp sensor is the primary cause of incorrect temperature readings and A/C issues in the 550i.
- The sensor is in a vulnerable location in the front passenger-side bumper area, so check for physical damage or broken wires first.
- This is an easy and inexpensive DIY replacement that typically takes less than 30 minutes.
- Quality aftermarket brands like Dorman, Standard Ignition, and URO Parts are cost-effective alternatives to the OEM part.
Is Your BMW 550i Showing the Wrong Temperature?
If you've noticed your 2006-2016 BMW 550i displaying a wildly incorrect outside temperature, like -40°F on a summer day, a faulty ambient air temperature sensor is the most likely culprit. This isn't just a minor annoyance; it directly impacts how your automatic climate control functions. The system relies on this sensor's reading to decide whether to engage the air conditioning compressor or blow hot air. A bad sensor can leave you without A/C on a hot day or blasting heat when you don't need it.
Symptoms of a Failing Ambient Air Temperature Sensor
- Incorrect Temperature Display: The most obvious sign is the temperature on your instrument cluster or iDrive being stuck at an extreme high (like 122°F) or low (-40°F), or fluctuating randomly.
- A/C Not Blowing Cold: If the sensor incorrectly tells the climate control system that it's freezing outside, the A/C compressor may not turn on.
- Automatic Climate Control Malfunction: The system may not regulate the cabin temperature correctly, blowing air that is too hot or too cold for the setting.
- Check Engine Light: A failed sensor can trigger a Check Engine Light and store diagnostic trouble codes like P0070, P0071, P0072, or P0073.
Common Cause of Failure: Location, Location, Location
The ambient air temperature sensor is located in a vulnerable spot on both the E60 (2006-2010) and F10 (2011-2016) generations of the 550i. It's typically mounted in the lower front bumper area, often in the passenger-side brake cooling duct or wheel well liner. This position exposes it to damage from road debris, parking curbs, and even deep puddles, which can rip the sensor off or damage its wiring.
Choosing the Right Aftermarket Sensor for Your 550i
When replacing this sensor, you don't necessarily need to pay for a Genuine BMW part. Several reputable aftermarket brands offer quality replacements that provide the same form and function at a lower price. The OEM part number is often 65816905133, which has been superseded by 65816936953. Aftermarket parts are designed to be direct-fit replacements for these numbers.
Aftermarket Brand Tiers
- URO Parts: Often the most budget-friendly option. URO Parts provides a direct-fit replacement that gets the job done. While some users on forums have mixed opinions on the brand for complex electronic parts, for a simple thermistor like this, it is generally considered a viable, low-cost solution.
- Dorman: A widely known aftermarket brand that offers a reliable replacement. Dorman parts are a common choice for DIY repairs and are considered a solid mid-tier option.
- Standard Ignition (SMP): Often regarded as a higher-quality aftermarket brand. Standard Ignition parts are known for their durability and are a good choice if you want a robust replacement without paying the premium for the BMW logo.
Pro Tip: Check the Wires First!
Before you order a new sensor, inspect the wiring and connector. Because of the sensor's location, the wires are often the first point of failure. Look for corrosion, breaks, or chafing. If the sensor is completely missing, you may need a new connector pigtail to splice into the harness. A reading of -40°F often indicates an open circuit (broken wire or unplugged sensor), while a reading of 122°F can indicate a short circuit (wires touching).
Cost of Replacing a BMW 550i Ambient Air Temperature Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Dorman, URO, Standard) | $19.87 - $57.94 |
| New OEM (Genuine BMW) | $55 - $75 |
| Shop Labor | $60 - $120 |
Frequently Asked Questions
Where is the ambient air temperature sensor located on my 550i?
On both the E60 (2006-2010) and F10 (2011-2016) 550i, the sensor is located in the front passenger side of the vehicle. You can typically find it by looking through the lower bumper grille or by accessing it from the front portion of the passenger-side wheel well. It's a small, black, probe-shaped sensor that plugs into the wiring harness.
Can I replace this sensor myself?
Yes, this is a very DIY-friendly job. In most cases, you can access the sensor by removing a few screws from the fender liner or by popping out the lower bumper grille. No special tools are required beyond basic hand tools. The sensor itself usually unplugs and unclips from its mounting bracket. The entire job can often be done in under 30 minutes.
Will a bad ambient temperature sensor cause my car not to start?
No, a faulty ambient air temperature sensor will not prevent your BMW 550i from starting or running. Its primary functions are related to the climate control system and the outside temperature display.
My temperature display is stuck at -40°F. Is the sensor bad?
A reading of -40°F typically signals an "open circuit." This means the computer is not receiving any signal from the sensor. This could be because the sensor has failed internally, the connector is unplugged, a wire is broken, or the sensor has been physically torn off the vehicle. Always check the wiring and connector first.
Are there any recalls for this part on the 2006-2016 BMW 550i?
No, there are no specific recalls or common Technical Service Bulletins (TSBs) from the NHTSA for the ambient air temperature sensor on the 2006-2016 BMW 550i. Failures are almost always due to its exposed location leading to physical damage.
Technical Specifications
OEM Part Numbers: 65816905133 65816936953
2-pin connector, press-fit or clip-in mounting. Located in the front passenger-side bumper/wheel well area.
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.
- BMW 550i:
- 🛍️ Shop This Part
- Is Your BMW 550i Showing the Wrong Temperature?
- Symptoms of a Failing Ambient Air Temperature Sensor
- Common Cause of Failure: Location, Location, Location
- Choosing the Right Aftermarket Sensor for Your 550i
- Aftermarket Brand Tiers
- Pro Tip: Check the Wires First!
- Cost of Replacing a BMW 550i Ambient Air Temperature Sensor
- Frequently Asked Questions
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