Saturn Outlook Engine Coolant Temperature Sensor Guide (2007-2010)
Dealing with a check engine light or erratic temperature gauge on your Saturn Outlook? Here’s what you need to know.
- A P0128 trouble code often points to a bad thermostat, not just the sensor.
- Be aware of the TSB for leaking water pumps on the 3.6L V6, which can cause similar overheating symptoms.
- Replacement is difficult due to the sensor's location; this is not a simple job for a beginner.
- Symptoms include poor fuel economy, a check engine light, and an erratic temperature gauge.
Is Your Outlook's Temperature Sensor Failing?
A faulty Engine Coolant Temperature (ECT) sensor can cause a range of problems, from annoying to potentially serious. Because the sensor provides key data for engine management, a bad signal can make the computer think the engine is hot when it's cold, or cold when it's hot. This confusion leads to noticeable symptoms.
Common Signs of a Bad ECT Sensor:
- Check Engine Light: This is often the first sign. Codes like P0117, P0118, or P0128 may be stored. 🎬 Watch: How to test and replace a faulty ECT sensor
- Poor Fuel Economy: If the sensor incorrectly tells the computer the engine is cold, the system will run a rich fuel mixture, wasting gas.
- Black Smoke from Exhaust: A very rich fuel mixture can result in unburnt fuel exiting through the exhaust, appearing as black smoke.
- Engine Overheating: A failed sensor might not trigger the cooling fans when needed, causing the engine to overheat. Conversely, the fans might run all the time.
- Erratic Temperature Gauge: The gauge on your dashboard may swing wildly, read consistently high, or not move at all.
- Rough Idling or Hard Starting: Incorrect fuel and timing adjustments can make the engine run poorly, especially when trying to start.
Known Issue: Water Pump Leaks
For the 2007-2010 Saturn Outlook, GM issued a special coverage adjustment for leaking water pumps (TSB 13091). A failing water pump can cause coolant loss, leading to overheating and symptoms that might be mistaken for a bad ECT sensor. Always check your coolant level and look for signs of leaks around the water pump area on the 3.6L V6 engine.
Choosing the Right Aftermarket Sensor
You don't need to buy the most expensive sensor to get a reliable part. Aftermarket brands offer a good balance of quality and price. They can be grouped into tiers based on their reputation and relationship with original equipment manufacturers (OEMs).
Tier 1: OEM & Premium Aftermarket
These brands are often original equipment suppliers to GM or are known for their extremely high quality and engineering. They are manufactured to meet or exceed OE specifications.
- ACDelco: As GM's own parts brand, their Professional and GM Genuine parts are a direct equivalent to what your vehicle was built with.
- Bosch: A world-renowned German manufacturer known for high-quality automotive components.
- Delphi: A major OE supplier with a strong reputation for quality electronics and sensors.
Tier 2: Quality Aftermarket
These brands are well-respected in the repair industry and provide reliable parts that are a great alternative to more expensive OE brands.
- NGK/NTK: While famous for spark plugs, NTK (an NGK company) produces high-quality sensors.
- Standard Ignition (SMP): A long-standing brand that offers a wide range of reliable replacement parts.
- Hella: Another German company known for quality electronics and lighting.
Tier 3: Economy Brands
This category includes brands that focus on providing a functional part at the lowest price point. While they can be a good value for a budget repair, their longevity and precision may not match the higher-tiered brands.
- Facet
- Four Seasons
- Walker Products
- Vemo
- And other house brands
Pro Tip: Check the Thermostat First!
A common trouble code associated with this sensor is P0128 (Coolant Temperature Below Thermostat Regulating Temperature). While this can be caused by a bad sensor, it is very frequently caused by a thermostat that is stuck open. If you have a P0128 code, consider replacing the thermostat at the same time as the sensor, or inspect it first.
🎬 See this walkthrough for replacing a stuck-open thermostatCost of Replacing the ECT Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $15 - $42 |
| New OEM Part (GM Genuine) | $35 - $60 |
| Shop Labor | $100 - $200 |
| Total Estimated Cost | $115 - $242 |
Costs are estimates and may vary based on location and parts availability. The labor cost reflects the difficult location of this sensor on the 3.6L V6 engine.
Frequently Asked Questions
Where is the ECT sensor located on the 2007-2010 Saturn Outlook?
The sensor is located on the front side of the engine in a tight space, to the right of the alternator and near the thermostat housing. It is notoriously difficult to access, sometimes requiring removal of the intake manifold for proper access, though some mechanics have found ways to do it without.
🎬 Watch: Replacing the sensor without removing the intake manifoldIs there a recall for the coolant temperature sensor on the Saturn Outlook?
No. As of early 2026, there are no specific recalls for the engine coolant temperature sensor on the 2007-2010 Saturn Outlook. There was a TSB related to the water pump, which is part of the same cooling system.
What do the common fault codes mean?
P0117: "Circuit Low Input" - The computer is seeing a voltage from the sensor that is lower than normal, often interpreted as an extremely high temperature. P0118: "Circuit High Input" - The computer sees a voltage higher than normal, often interpreted as an extremely low temperature. P0128: "Coolant Temperature Below Thermostat Regulating Temperature" - The engine isn't warming up as fast as the computer expects, which often points to a thermostat stuck open.
Can I replace this sensor myself?
While possible for an experienced DIY mechanic, this is not a simple job. The sensor's location on the 3.6L V6 is very tight and hard to reach. It requires specific tools (like wobble extensions or custom-made wrenches) and a lot of patience. For most owners, this repair is best left to a professional.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12650595
2-blade terminal, threaded mount, oval connector.
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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.
- Saturn Outlook:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Outlook's Temperature Sensor Failing?
- Common Signs of a Bad ECT Sensor:
- Known Issue: Water Pump Leaks
- Choosing the Right Aftermarket Sensor
- Tier 1: OEM & Premium Aftermarket
- Tier 2: Quality Aftermarket
- Tier 3: Economy Brands
- Pro Tip: Check the Thermostat First!
- Cost of Replacing the ECT Sensor
- Frequently Asked Questions
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