More Saab Coolant Temperature Sensor (9-3) - Facet 12566778
Saab Coolant Temperature Sensor (9-3) - Facet 12566778
Facet
SKU: FAC-73239

Saab Coolant Temperature Sensor (9-3) - Facet 12566778

9-3

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Original: $18.39
Price each: $14.71
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Description

Details

SKU:
FAC-73239
FCP Euro ID:
477182
GTIN / UPC:
08012510078563
Made in:
Italy
Quality:
OE

OE Numbers

12566778, 12639899

MFG Numbers

73239

Product Information

Engine Coolant Temperature Sensor

The engine coolant temperature (ECT) sensor, or simply coolant temp sensor, plays a vital role in monitoring the engine's operating temperature and communicating this information to various vehicle systems. This sensor is located in the engine's coolant passage typically in the cylinder head or block. It works by varying its resistance based on the temperature: as the engine heats up, the resistance decreases, and as it cools down, the resistance increases. The ECT sensor sends this data to the ECU, which uses it for several critical functions, such as the air-fuel mixture, ignition timing, and control of the cooling fans and dashboard temperature gauge. There are many European applications where there is more than one coolant temp sensor, separating the signals used for engine ECU and other functions such as gauges and fans.

A faulty sensor might send incorrect temperature readings to the ECU, resulting in poor engine performance. The most common example is if the sensor incorrectly signals that the engine is colder than it is, the ECU will enrich the air-fuel mixture unnecessarily, leading to rough idling, poor fuel economy, or even black smoke from the exhaust due to unburnt fuel.

Conversely, if the sensor falsely indicates an engine overheating condition, the ECU might trigger warning lights, prematurely activate the cooling fans, or even cause the car to go into "limp mode," limiting engine power to prevent damage (however this is a rarer failure mode).

Engine Coolant Temperature Sensor Failure Symptoms
  • Wrong Temp Readings: If the coolant temperature gauge is acting unpredictably, or reading consistently too high or too low, it may be either a coolant temperature sensor or a thermostat. Because of this, it’s common to replace both of these parts at the same time for the best probability of success while the cooling system is opened.
  • Running too rich: If you have noticed the temperature gauge is low and the exhaust is black and sooty, the engine might be stuck in the warm-up loop due to a bad coolant temperature sensor even though the engine is at the proper operating temperature controlled by the thermostat.
  • Non-linear or suspicious live data output: For vehicles equipped with OBDII, use a scan tool to monitor the exact temperatures being output from the sensor. As the car warms up the output should be smooth and linear. If there are dead spots or it acts suspiciously, you may need to replace the sensor.

About Facet

Facet began in 1946 by Francesco Andriano with the core principles of dedication, skill, courage to do, and to innovate when he opened up his laboratory. Soon after WWII, Franceso Andiano founded F.A.C.E.T with his son Mario. They began creating tungsten contacts for the telephone industry which was then a potential market with rapid growth. Due to the materials used, they were able to enter into another market, now producing plated contacts for ignition components in the Automotive Industry. In 1961 the company expanded by now producing condensers followed by caps and rotors in 1966. Since the early 90's, FACET has transformed to accommodate the arrival of electronics which as been a large part to this day. Since then, FACET has put a strong emphasis on continuous process improvements which continue to this day.

Fits These Cars

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    Automatic AWD Wagon 2.0L L4 B207R Gas
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    Automatic FWD Wagon 2.0L L4 B207R Gas
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    Manual AWD Wagon 2.0L L4 B207R Gas
  • 2009 Saab 9-3 2.0T Engine Coolant Temperature Sensor
    Manual FWD Wagon 2.0L L4 B207R Gas
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    Manual AWD Sedan 2.8L V6 B284R Gas
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    Automatic AWD Wagon 2.8L V6 B284R Gas
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