Brand New *OEM Quality* Coolant Temperature Gauge Sender / Sensor To Suit Old CLASSIC Landcruiser (BJ40 FJ40 FJ45 FJ55 HJ45) 1972-84

Keep your legendary 4x4 engine running at the perfect temperature with our premium replacement coolant temperature sender. This direct-fit sensor delivers highly accurate thermal data to your dashboard gauge ensuring you can monitor your engine temps safely while off-roading or towing. We hold local Aussie stock right here in our Cranbourne VIC warehouse ready to ship daily to get your Landcruiser back on the tracks.

IMPORTANT FITMENT CHECK

Please check your original factory sensor and compare the thread and single-pin terminal shape to our product images. Ensure your original part matches OEM number 83420-12010 or 83420-20011 to guarantee proper fitment on your Landcruiser.

TO SUIT:

Suitable for Toyota Land Cruiser 1972- 84
(BJ40 FJ40 FJ45 FJ55 HJ45)
Engine Codes for the Vehicles: ( F, 2F, H)

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

Why is my FJ40 temperature gauge jumping around erratically?
A failing or corroded single-pin temperature sender will send inconsistent electrical resistance to your dashboard gauge causing the needle to bounce or read dead cold.

Does this fit the original Landcruiser wiring harness?
Yes this sensor is engineered to exact OEM specifications and connects directly to your factory wiring terminal without any messy modifications.

Where do these ship from?
All orders are processed and shipped daily directly from our physical warehouse located locally in Cranbourne North Victoria.

[08/74 - 07/84] TOYOTA LANDCRUISER FJ40 4.2L 6cyl 2F
[08/74 - 07/84] TOYOTA LANDCRUISER FJ45 4.2L 6cyl 2F
[08/74 - 07/80] TOYOTA LANDCRUISER FJ55 4.2L 6cyl 2F
[08/74 - 07/80] TOYOTA LANDCRUISER BJ40 3.0L 4cyl B
[08/64 - 07/74] TOYOTA LANDCRUISER FJ40 3.9L 6cyl F
[08/66 - 07/74] TOYOTA LANDCRUISER FJ45 3.9L 6cyl F
[08/66 - 07/74] TOYOTA LANDCRUISER FJ55 3.9L 6cyl F
[04/72 - 06/80] TOYOTA LANDCRUISER HJ45 3.6L 6cyl H

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
Brand	Aftermarket OEM Replacement
Part Numbers
Part Number	CTS104
Reference OEM Number	83420-12010
Other OEM Numbers	83420-12010, 83420-20011, 8342012010
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