BRAND NEW OEM Quality COOLANT TEMPERATURE GAUGE SENDER / SENSOR TO SUIT ISUZU 1976- KS21 KT26 NPR NKR 4BB1 4BD1 4BC2 4BE1 4BD1 NPR58 NPR57 NKR57 NPR57

IMPORTANT FITMENT CHECK

Please verify your original temperature sender matches the 1-pin round connector and M16x1.5 thread shown in our images. This sender is essential for providing accurate engine temperature readings to your dashboard gauge on Isuzu commercial trucks.

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

COMPATIBLE VEHICLES

Isuzu N Series NPR57 NPR58 NPR59 [1985-2002] 4BC2 4BE1 4BD1
Isuzu N Series NKR57 NKR58 NKR66 [1984-2005] 4BC2 4BE1 4HF1
Isuzu KS32 KT25 KT26 TLD [1976-1984]

OEM#

Isuzu 8-94235691-0 8942356910 8-94235-691-0
Isuzu 8-94024-121-0 5-83161-001-0 9-83151-419-0
General Motors 94235691 94237861 1338505 1338506
Trade Reference CTS139 V40-72-0437 211-1085

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.

Why is my Isuzu truck temperature gauge not working?

A failing temperature gauge sender will cause the dashboard needle to read totally cold read incorrectly or jump around erratically. Replacing the sender restores accurate temperature monitoring to prevent engine overheating.

Is this sender difficult to install on an Isuzu NPR?

It is a straightforward replacement. The sender features an M16x1.5 thread and uses a 17mm spanner for installation. Ensure the engine is cool before removing the old sender to avoid coolant burns.

Does this sensor communicate with the ECU?

No this specific 1-pin sender is dedicated solely to operating the dashboard temperature gauge. It does not provide data to the engine control unit.

NKR57 4BC2 3.3L 1984-87
NKR58 -94 4BE1 3.6L 1987-94
NKR66 -94 4HF1 4.3L 1991-94
NKR66 94- 4HF1 4.3L 1994-05
NPR57 4BC2 3.3L 1984-87
NPR58 -94 4BE1 3.6L 1987-94
NPR59 4BD1/T 3.9L 8/91-1994
NPR66 -94 4HF1 4.3L 1991-94
NPR66 94- 4HF1 4.3L 1994-05
NPR70 4HE1T 4.8L 1999-
NPR71 4HG1/T 4.6L 1996-05
ISUZU KS32 1979-1984
ISUZU KT25 1979-1984
ISUZU KT26 1979-1984
ISUZU TLD 1976-1984
ISUZU N SERIES NKR57 1985-1988
ISUZU N SERIES NKR58 1987-1994
ISUZU N SERIES NKR58 1994-1996
ISUZU N SERIES NKR66 1994-1997
ISUZU N SERIES NKR66 1998-2002
ISUZU N SERIES NKR69 1996-1997
ISUZU N SERIES NKR77 2002-2004
ISUZU N SERIES NKR77 2005-2007
ISUZU N SERIES NPR57 1985-1987
ISUZU N SERIES NPR58 1988-1993
ISUZU N SERIES NPR58 1994-1995
ISUZU N SERIES NPR59 1985-1994
ISUZU N SERIES NPR66 1991-1994
ISUZU N SERIES NPR66 1994-1996
ISUZU N SERIES NPR66 1996-1998
ISUZU N SERIES NPR66 1998-2002
ISUZU N SERIES NPR70 2000-2002
ISUZU N SERIES NPR71 1998-2002
ISUZU N SERIES NPS66 1993-1998
ISUZU N SERIES NPS71 1997-2003
ISUZU N SERIES NQR70 1998-2002

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	CTS139-ISUZU
Brand	Aftermarket OEM Replacement
Part Numbers
Part Number	CTS139
Reference OEM Number	8-94235691-0
Other OEM Numbers	94235691, 94237861, 8942356910, 8942378610, 8942520510
Related Part Numbers	15451.006, 2V0602, 83420.014
Trade Part Numbers	VEMO: V40-72-0437, WALKER: 211-1085
Product Specifics
Product Type	SENSOR
Sensor Type	COOLANT TEMPERATURE GAUGE SENDER
Thread Size	M16x1.5 mm
Spanner Size	17 mm
Number of pins	1 -pin connector
Housing Colour	Black
Plug Type	Round Plug
Other Details
Note	Always verify fitment using your vehicle's OEM part number.