Brand New *OEM Quality* Coolant Temperature Gauge Sender / Sensor To Suit Old Toyota HiAce Corona Celica Crown / Subaru Daihatsu and More

Fix your rough idle and poor fuel economy by replacing your failing coolant temperature sensor. This premium OEM-equivalent unit ensures your engine computer receives the precise temperature data it needs to calculate the perfect air and fuel mixture. Best of all we dispatch daily from our Melbourne facility in Cranbourne North so you are not left waiting for your repair parts to arrive from overseas.

IMPORTANT FITMENT CHECK

Please visually confirm your factory sensor matches the connector style shown in our product images. Verify your original part number is either 21203-AA000 or 82080-4150 before ordering to ensure correct plug-and-play fitment.

TO SUIT:

OEM#

21203-AA000, 82080-4150, 83420-12010, 83420-20011

PACKAGE INCLUDES:

1 X *OEM Quality* COOLANT TEMPERATURE GAUGE SENDER / SENSOR (1- PIN PLUG).

The Engine Coolant Temperature Sensor (CTS) is used to measure the temperature of the engine coolant of an engine. The readings from this sensor are then fed back to the engine control unit (ECU), which uses this data to adjust the fuel injection and ignition timing.

Common signs of a bad or failing coolant temperature sensor include poor fuel economy, engine overheating black smoke from the engine, and the Check Engine Light turning on.

COMMON QUESTIONS

Will a broken temp sensor cause my Subaru to run rich?
Yes if the sensor fails and tells the ECU the engine is constantly freezing cold the computer will dump excess fuel into the cylinders causing poor economy and a rough idle.

Is this an exact fit for my Daihatsu?
Provided your original factory sensor displays the part number 82080-4150 this unit will thread perfectly into your engine block and accept the factory plug.

How fast will I receive this part?
We hold all our stock locally and dispatch daily from our Cranbourne warehouse so most Aussie customers receive their essential repair parts rapidly.

Chevrolet C10 4.8L 6cyl L25 1974 - 1981
Daihatsu Delta V10 V98 3.0L 1983 - 1996
Daihatsu Scat F20 F25 1.6L 1976 - 1985
Ford Courier PC 2.6L 4G54 1987 - 1992
Mazda B-Series B2600 UF UFY0 2.6L 4G54 G54B 1987 - 1991
Subaru Brumby AS 1.6L 1.8L 1978 - 1994
Subaru L Series 1.4L 1.6L 1.8L 1973 - 1990
Subaru Leone Series II III 1.6L 1.8L 1975 - 1992
Subaru Outback BG9 2.5L 1996 - 1999
Subaru Vortex AX4 AX7 1.8L 1984 - 1990
Toyota 4 Runner YN60 2.0L 1984 - 1985
Toyota Celica RA23 RA28 TA22 1.6L 2.0L 1971 - 1977
Toyota Coaster BB20 BB21 BB26 BB30 3.4L 1982 - 1993
Toyota Corolla AE80 AE82 KE10 to KE70 1.1L 1.2L 1.3L 1.6L 1967 - 1989
Toyota Corona and Mark II MX10 to XT130 1.5L to 2.6L 1964 - 1983
Toyota Crown MS40 to MS111 2.0L 2.3L 2.6L 1966 - 1980
Toyota Dyna 200 BU and RU Series 2.0L to 4.0L 1968 - 1995
Toyota Hiace RH10 to RH42 1.5L 1.6L 2.0L 1968 - 1985
Toyota Hilux and Surf RN10 to YN65 1.5L to 2.4L 1968 - 1998
Toyota Land Cruiser 40 55 60 70 Series 3.4L to 4.2L 1960 - 1990
Toyota Liteace YM21 to YM41 1.8L 2.0L 1984 - 1998
Toyota Spacia YR30 2.0L 1992 - 1996
Toyota Stout RK101 RK110 2.0L 1967 - 1983
Toyota Supra MA70 3.0L 1986 - 1993
Toyota Town Ace YR20 to YR36R 1.8L 2.0L 1985 - 1991

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	CTS104-4
Brand	Aftermarket OEM Replacement
Part Numbers
Part Number	CTS104
Reference OEM Number	8342012010
Other OEM Numbers	21203-AA000, 82080-4150, 83420-12010, 83420-20011
Related Part Numbers	TTS005, CTS104, TS-61
Product Specifics
Product Type	SENSOR
Sensor Type	COOLANT TEMPERATURE GAUGE SENDER
Type	Sensor
Features	Direct Fit
Manufacturer Warranty	1 Year
Make	Toyota
Thread Size	M16x1.5 mm
Spanner Size	17 mm
Connector Shape	Round
Plug Type	Blade Terminal
Other Details
Note	Always verify fitment using your vehicle's OEM part number.
Unit Of Measure	ea