IMPORTANT FITMENT CHECK

Verify your Engine Code! Suitable for MZR and DISI Turbo engines. Check your old sensor matches the Grey 2-Pin Rectangular connector in the images.

Ships Daily from our Cranbourne VIC Warehouse. Unsure about fitment? Contact Our expert team.

COMPATIBLE VEHICLES

Mazda 3 BK BL (2.0L 2.3L SP23 2.5L SP25 & MPS Turbo) [2003-2013]
Mazda 6 GG GY GH (2.0L 2.3L 2.5L & MPS Turbo) [2002-2012]
Mazda CX-7 ER (2.3L DISI Turbo & 2.5L MZR) [2006-2014]
Mazda CX-9 TB (3.7L V6) [2007-2016]
Mazda MX-5 NC (2.0L) [2005-2014]
Mazda Tribute EP (2.3L) [2004-2008]
Mazda 626 GF GW (2.0L) [1997-2002]

OEM#

FSB918840, FSB9-18-840, L35G18840, L35G-18-840, LF0118840, LF01-18-840, LF01-18-840 A, LF0118840A, LF01-18-840A

PACKAGE INCLUDES:

1 X OEM Quality ENGINE COOLANT TEMPERATURE SENSOR (2-PIN PLUG).

The Engine Coolant Temperature Sensor, often called ECT sensor or CTS (Coolant Temperature Sensor), is a crucial component in a vehicle's engine management system. It measures the temperature of the engine coolant and sends this information to the engine control unit (ECU) or the powertrain control module (PCM). This data helps the ECU adjust fuel injection, ignition timing, and other engine parameters to ensure optimal performance, fuel efficiency, and emission control.

If the coolant temperature sensor malfunctions or fails, it can lead to issues such as incorrect fuel mixture, poor engine performance, increased emissions, or problems with starting the engine. A failing sensor might cause the engine to run too rich or too lean, impacting fuel efficiency and potentially causing damage to the engine over time.

COMMON QUESTIONS

What are the symptoms of a bad sensor?
Hard starting rough idle black smoke and cooling fans running at full speed.

Is this for the Turbo model?
Yes this fits both the MPS Turbo and standard MZR engines.

Do I need thread tape?
No this sensor includes a metal or rubber washer for sealing.

[08/02 - 08/05] MAZDA ATENZA GG (GREY IMPORT) 2.3L 4cyl L3-VE
[11/06 - 12/11] MAZDA CX-7 ER 2.3L 4cyl L3-VDT 175kW
[10/09 - 01/12] MAZDA CX-7 ER 2.5L 4cyl L5-VE
[12/07 - 06/16] MAZDA CX-9 TB 3.7L V6 Duratec MZI 204kW
[07/11 - 06/16] MAZDA CX-9 TB 3.7L V6 Duratec MZI 204kW
[01/04 - 06/06] MAZDA MAZDA3 BK 2.0L 4cyl LF-DE
[07/06 - 03/09] MAZDA MAZDA3 BK 2.0L 4cyl LF-VE
[07/06 - 03/09] MAZDA MAZDA3 BK MPS 2.3L 4cyl L3-VDT
[01/04 - 06/06] MAZDA MAZDA3 BK SP23 2.3L 4cyl L3-VE
[07/06 - 03/09] MAZDA MAZDA3 BK SP23 2.3L 4cyl L3-VE
[03/09 - 11/13] MAZDA MAZDA3 BL 2.0L 4cyl LF-VE
[03/09 - 11/13] MAZDA MAZDA3 BL MPS 2.3L 4cyl L3-VDT
[03/09 - 11/13] MAZDA MAZDA3 BL SP25 2.5L 4cyl L5-VE
[08/02 - 08/05] MAZDA MAZDA6 GG 2.3L 4cyl L3-VE
[09/05 - 12/07] MAZDA MAZDA6 GG 2.3L 4cyl L3-VE
[09/05 - 12/07] MAZDA MAZDA6 GG MPS 2.3L 4cyl L3-VDT
[01/08 - 11/12] MAZDA MAZDA6 GH 2.5L 4cyl L5-VE
[08/02 - 08/05] MAZDA MAZDA6 GY 2.3L 4cyl L3-VE
[09/05 - 02/08] MAZDA MAZDA6 GY 2.3L 4cyl L3-VE
[09/05 - 12/14] MAZDA MX-5 NC 2.0L 4cyl LF-VE
[01/04 - 12/08] MAZDA TRIBUTE EP 2.3L 4cyl L3-VE

How do I test a coolant temperature sensor?

The most common test is to measure the sensor resistance with a multimeter at a known coolant temperature and compare against the manufacturer resistance curve. A cold engine (20 degrees C) typically reads 2,000 to 3,000 ohms and drops to around 200 to 300 ohms at operating temperature (90 degrees C). An OBD2 scanner showing a fixed temperature reading that does not change as the engine warms up is also a strong indicator of sensor failure.

Can a faulty coolant temperature sensor cause my engine to overheat?

Indirectly yes. If the sensor reports a lower temperature than actual, the ECU may not activate the cooling fan at the correct time, allowing the engine to overheat. It can also suppress the dashboard warning light, meaning you may not be alerted until the engine is already at a dangerously high temperature. Replace a suspected faulty sensor promptly.

Do I need to drain the coolant to replace the sensor?

Not always - many coolant temperature sensors can be replaced quickly with minimal coolant loss if you work fast and have a replacement ready to thread in immediately. However on some vehicles the sensor location requires partial coolant drainage. Check the sensor position on your specific engine before starting. Always use fresh coolant when topping up after replacement.

What are the symptoms of a faulty coolant temperature sensor?

Symptoms include poor fuel economy, black smoke, engine overheating warning, incorrect temperature gauge reading, hard starting when cold, and rough idle. Fault codes P0115 to P0119 are commonly associated with coolant temperature sensor faults.

Is it safe to drive with a bad coolant temperature sensor?

A faulty coolant temperature sensor can cause the ECU to run rich fuel mixtures and prevent the cooling fan from operating correctly, risking engine overheating. Replace it promptly - it is a low-cost part that can prevent expensive engine damage.

How do I know if my coolant temperature sensor or my thermostat is faulty?

A faulty thermostat typically causes the engine to overheat or never reach operating temperature. A faulty coolant temp sensor causes incorrect gauge readings and running issues but the coolant itself may be at the correct temperature. An OBD2 scanner showing live coolant temp data helps distinguish between the two.

Are there two coolant temperature sensors on my vehicle?

Many vehicles have two sensors - one for the ECU (engine management) and one for the dashboard temperature gauge. They look similar but are not interchangeable. Check your vehicle's service manual or contact us with your vehicle details to confirm which sensor you need.

Identification
SKU	CCS40-Mazda
Barcode #	9314258071998
Brand	Aftermarket OEM Replacement
Part Numbers
Part Number	CCS40
Reference OEM Number	L35G-18-840
Other OEM Numbers	F62Z12A648AA, LF01-18-840A, XU3F12A648AA
Related Part Numbers	CCS40, CS845, TCS124, TS10287, TX138
Trade Part Numbers	VEMO: V25-72-0046, WALKER: 211-1042
Product Specifics
Sensor Type	ENGINE COOLANT TEMPERATURE SENSOR
Type	Sensor
Features	Direct Fit
Manufacturer Warranty	1 Year
Ean	9314258071998
Thread Size	M12 X 1.5 mm
Spanner Size	19 mm
Number of pins	2 -pin connector
Connector Shape	rectangular
Supplementary Article Info	with seal ring
Housing Colour	Grey
Other Details
Note	Always verify fitment using your vehicle's OEM part number.
Unit Of Measure	ea