BRAND NEW *OEM Quality* Coolant Temperature Sensor for Mazda 3 6 CX-7 CX-9 and MX-5 MZR and DISI Turbo engines.

A failing coolant sensor sends the wrong signal to the ECU, causing rough idle, poor fuel economy or a stuck temperature gauge. This direct-fit replacement restores accurate readings and is dispatched same-day from our Cranbourne VIC warehouse.

TO SUIT

Mazda 3 BK/BL (2.0L, 2.3L SP23, 2.5L SP25 & MPS Turbo) [2003-2013]
Mazda 6 GG/GY/GH (2.0L Diesel, 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 AWD) [2007-2016]
Mazda MX-5 NC (2.0L) [2005-2014]
Mazda 626 & Tribute (2.0L & 2.3L) [1997-2008]

FITMENT CHECK

Verify your engine code! Suits MZR, DISI Turbo and MZR-CD engines with a Rectangular 2-Pin Grey Plug. If your original sensor is oval-shaped or has 3 pins, this is not the correct part.

OEM PART NUMBERS

L35G-18-840
LF01-18-840A
FSB9-18-840

OTHER PART NUMBERS

V25-72-0046
211-1042

PACKAGE INCLUDES

1 x OEM Quality Engine Coolant Temperature Sensor (2-Pin Plug), complete with sealing ring.

ABOUT THIS SENSOR

The Engine Coolant Temperature Sensor (ECT/CTS) measures coolant temperature and reports it to the ECU, which uses that reading to adjust fuel injection, ignition timing and cooling fan operation.

On the MPS and CX-7 DISI Turbo engines a failed sensor can also affect boost and knock control, since the ECU leans on coolant temperature to manage turbo timing - so a stuck or drifting reading is worth checking early.

COMMON SYMPTOMS OF FAILURE

Temperature gauge reading incorrectly, stuck on cold, or fluctuating
Engine warning light with fault code P0117 or P0118
Rough idle or hesitation, especially on a cold start
Cooling fans running constantly or not engaging at all
Poor fuel economy from an over-rich fuel mixture

[2003 - 2006] MAZDA 3 BK 2.0L 4cyl LF-DE,LF72 104kW (Hatchback)
[2003 - 2006] MAZDA 3 BK 2.0L 4cyl LF-DE,LF72 104kW (Sedan)
[2003 - 2009] MAZDA 3 BK 2.3L 4cyl L3-VE 115kW (Hatchback)
[2003 - 2009] MAZDA 3 BK 2.3L 4cyl L3-VE 115kW (Sedan)
[2006 - 2009] MAZDA 3 BK 2.0L 4cyl LF-VE,LF-DE,LF50,LF72,LFN7,LFN8 110kW (Hatchback)
[2006 - 2009] MAZDA 3 BK 2.0L 4cyl LF-VE,LF-DE,LF50,LF72,LFN7,LFN8 110kW (Sedan)
[2006 - 2009] MAZDA 3 BK 2.3L 4cyl L3M6,L3-VDT 191kW (Hatchback)
[2008 - 2013] MAZDA 3 BL 2.3L 4cyl L3-VDT,L3Y7 191kW (Hatchback)
[2009 - 2013] MAZDA 3 BL 2.0L 4cyl LF5H,LF-VE,LF5W 108kW (Hatchback)
[2009 - 2013] MAZDA 3 BL 2.0L 4cyl LF5H,LF-VE,LF5W 108kW (Sedan)
[2009 - 2013] MAZDA 3 BL 2.3L 4cyl L3-VDT 194kW (Hatchback)
[2009 - 2013] MAZDA 3 BL 2.5L 4cyl L5-VE 122kW (Hatchback)
[2009 - 2013] MAZDA 3 BL 2.5L 4cyl L5-VE 122kW (Sedan)
[2011 - 2013] MAZDA 3 BL 2.0L 4cyl PE-VPS,PEY2 113kW (Sedan)
[2011 - 2013] MAZDA 3 BL 2.0L 4cyl PE-VPS,PEY7 113kW (Hatchback)
[2005 - 2010] MAZDA 5 CR 2.0L 4cyl LFF7 107kW (MPV)
[2002 - 2008] MAZDA 6 GG 2.3L 4cyl L3C1,L3-VE 122kW (Hatchback)
[2002 - 2008] MAZDA 6 GG 2.3L 4cyl L3C1,L3-VE 122kW (Sedan)
[2002 - 2008] MAZDA 6 GY 2.3L 4cyl L3C1,L3-VE 122kW (Station Wagon)
[2005 - 2008] MAZDA 6 GG 2.3L 4cyl L3-VDT,L3KG 191kW (Sedan)
[2006 - 2008] MAZDA 6 GG 2.0L 4cyl RF7J 105kW (Hatchback)
[2006 - 2008] MAZDA 6 GG 2.0L 4cyl RF7J 105kW (Sedan)
[2008 - 2012] MAZDA 6 GH 2.5L 4cyl L5-VE 125kW (Hatchback)
[2008 - 2012] MAZDA 6 GH 2.5L 4cyl L5-VE 125kW (Sedan)
[2008 - 2012] MAZDA 6 GH 2.5L 4cyl L5-VE 125kW (Wagon)
[1997 - 2002] MAZDA 626 MKV 2.0L 4cyl FS 93kW (Sedan)
[1998 - 2002] MAZDA 626 MKV 2.0L 4cyl FS 93kW (Hatchback)
[1998 - 2002] MAZDA 626 MKV 2.0L 4cyl FS 93kW (Station Wagon)
[2006 - 2014] MAZDA CX-7 ER 2.3L 4cyl L3-VDT 175kW (SUV)
[2009 - 2013] MAZDA CX-7 ER 2.5L 4cyl L5-VE 120kW (SUV)
[2007 - 2016] MAZDA CX-9 TB 3.7L 6cyl CAY1,CAY5,CAY6,CA 204kW AWD (SUV)
[2005 - 2014] MAZDA MX-5 MKIII 2.0L 4cyl LFY7,LFG8,LF-VE,LFG7,LFZD 118kW (Convertible)
[2004 - 2008] MAZDA TRIBUTE EP 2.3L 4cyl L3-VE 110kW (SUV)

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
Brand	Aftermarket OEM Replacement
Part Numbers
Part Number	SCCS40
Reference OEM Number	L35G-18-840
Other OEM Numbers	L35G-18-840, LF01-18-840A, FSB9-18-840
Related Part Numbers	CCS40, CS845, TCS124, TS10287, TX138
Interchange Part Numbers	V25-72-0046, 211-1042
Product Specifics
Product Type	SENSOR
Sensor Type	Coolant Temperature Sensor
Manufacturer Warranty	1 Year
Ean	9314258071998
Thread Size	M12 x 1.5mm
Spanner Size	19mm
Number of pins	2-Pin
Connector Shape	rectangular
Housing Colour	Grey
Mounting Type	Screw Connection
Compatible Makes	Mazda
Fitment Type	Direct Replacement
Other Details
Note	Always verify fitment using your vehicle's OEM part number.
Unit Of Measure	ea