Parts for your 2007 Mazda Premacy-Temperature sensors

2007 Mazda Premacy temperature sensors

Yes — temperature sensors are fitted and essential on the 2007 Mazda Premacy. Technical sources including the Mazda Premacy/Mazda5 (CR, 2005–2010) Workshop Manual (Engine Control System: ECT and IAT sections), HVAC and Body Electrical sections (ambient and evaporator temperature sensors), and Mazda wiring diagrams confirm multiple temperature sensors are used for engine management, cooling fan control, transmission logic (auto), and climate control.

On this model, the Engine Coolant Temperature (ECT) sensor tells the ECU how hot the engine is so it can manage warm-up fuelling, ignition timing, and kick the radiator fans on when needed. The Intake Air Temperature (IAT) sensor — often integrated in the MAF on Mazda’s MZR engines — helps the ECU adjust for air density so the mix stays spot on in Kiwi and Aussie conditions from frosty mornings to scorching arvos. There’s also an ambient air temp sensor near the front bumper for HVAC, and an evaporator temp sensor to stop the A/C icing up. Autos may reference an ATF temp sensor for shift quality and protection.

There’s no fixed replacement interval for these sensors, but they’re worth a look during regular servicing. Quick checks that pay off:

• Scan live data: a healthy, warmed-up ECT typically settles around the low-to-mid 90s °C, IAT should be close to ambient after an overnight cold soak.
• Inspect connectors and looms under the bonnet for corrosion, oil wicking, or cracked plugs — common causes of dodgy readings.
• If the IAT sits in the intake duct/MAF, ensure the air filter is clean and the sensor isn’t coated in oil, clean gently with sensor-safe cleaner.
• Keep the cooling system in spec using the correct Mazda long-life coolant (often FL22) and fix any leaks, air pockets can skew ECT readings.

Symptoms of a crook temp sensor include hard cold starts, rich running, high fuel use, erratic temp gauge, cooling fans stuck on, A/C that won’t behave, or stored codes like P0116–P0119 (ECT) or P0112–P0113 (IAT). When replacing, match the sensor by VIN, swap the sealing washer or O-ring if specified, and tighten only to the manufacturer’s light torque — don’t lean on it. For ECT, top up and bleed the cooling system properly, then confirm with a scan that temps and fan operation look normal on a road test. Quality genuine or OEM-equivalent parts save headaches, and a quick recheck at the next service keeps everything sweet.

Popular questions about 2007 Mazda Premacy temperature sensors

Q: Where is the engine coolant temperature (ECT) sensor on a 2007 Premacy?

A: On the MZR 2.0/2.3 petrols it’s typically threaded into or near the thermostat housing on the cylinder head side, reachable from the top with basic hand tools. Follow the upper radiator hose to the housing and you’ll spot the small two-pin sensor.

Q: Can a faulty temp sensor make the radiator fans run all the time?

A: Yes. If the ECU sees an implausible ECT value (like -40 °C or very hot), it often goes to failsafe and commands the fans on to protect the engine. You’ll usually find a related fault code when scanning.

Q: Does the 2007 Premacy have more than one temperature sensor?

A: It does. Beyond the ECT for the engine, there’s an IAT (often built into the MAF), an ambient sensor up front for HVAC, and an evaporator temp sensor. Automatic models also reference transmission fluid temperature for shift control.