BRAND NEW *OEM Quality* Coolant Temperature Sender to suit Mazda MX-5 NA, MX-6, RX-7, Eunos 30X / 500 / 800 and Mazda MPV - 1986 to 1999.

Temperature gauge unreliable on your Mazda sports or import? This coolant temperature sender suits the NA MX-5, MX-6 GE and the full Eunos range on a single OEM part number. Also suits the Mazda T-Series truck and Mazda 929. Same-day dispatch from Melbourne.

TO SUIT

This sender suits the Mazda MX-5 NA 1.6L B6-ZE and 1.8L BP-ZE, MX-6 GE 2.5L KL, RX-7 FC and FD 1.3L 13B rotary, Eunos 30X, 500 and 800, and Mazda MPV LV 3.0L JE V6. Also suits Mazda 929, T-Series T3500 T4000 T4600 diesel trucks and the 121 / 323 / 626 range on OEM Y70118510 / JE151851X. Connector: 1-pin push-on blade. Thread: 1/8 GAS.

OEM PART NUMBERS

Y70118510
KL011851X
JE151851X
B5411851X

OTHER PART NUMBERS

TS198

PACKAGE INCLUDES

1 x Coolant Temperature Sender (1-pin push-on blade terminal / 1/8 GAS thread)

ABOUT THIS SENDER

The coolant temperature sender is a single-wire thermistor that drives the temperature gauge. It is a separate component to the ECU coolant temperature sensor and does not trigger fault codes when it fails. On Mazda sports engines including the BP and KL V6 it threads into the cylinder head or block near the thermostat.

A faulty sender is the most common cause of erratic or pinned temperature gauge readings on these Mazda engines. It is inexpensive and simple to replace before chasing more complex cooling system faults.

COMMON SYMPTOMS OF FAILURE

Temperature gauge stuck at maximum or minimum
Gauge reading erratically or fluctuating
Gauge reads cold at operating temperature
Gauge reads hot on cold start
Intermittent gauge behaviour

[10/89 - 04/98] MAZDA MX-5 NA6C NA8C 1.6L B6-ZE / 1.8L BP-ZE
[11/91 - 09/97] MAZDA MX-6 GE 2WS / 4WS 2.5L KL V6
[11/85 - 08/02] MAZDA RX-7 FC FD 1.3L 13B 8-Port / Turbo (Rotary)
[01/91 - 12/95] MAZDA EUNOS 30X EC13 1.8L K8-ZE V6
[01/92 - 12/99] MAZDA EUNOS 500 CA 2.0L KF27 V6
[09/93 - 09/98] MAZDA EUNOS 800 TA 2.3L KJY5 / 2.5L KL-ZE V6
[04/96 - 05/99] MAZDA MPV LV 3.0L JE96 V6
[05/87 - 01/98] MAZDA 929 HCSS HDES HEEP 2.0L JE / 3.0L JEZE V6
[11/89 - 07/00] MAZDA T-SERIES T4000 4.0L TF (Diesel Truck)
[09/87 - 04/92] MAZDA T-SERIES T3500 SL Turbo (Diesel Truck)
[06/92 - 07/00] MAZDA T-SERIES T4600 TM (Diesel Truck)
[01/83 - 04/97] MAZDA 626 GC GD GE GF 1.8L-2.5L F2 / FS / KL-ZE
[01/77 - 09/98] MAZDA 323 BD BF BG BA BJ 1.3L-1.8L E3 / E5 / B6 / BP / ZM
[11/90 - 12/02] MAZDA 121 DB DW 1.3L-1.5L B3 / B5
[01/84 - 07/06] MAZDA E-SERIES SR2 SG SK 2.0L FE / 1.8L F8 (Van)

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	CTS110-TS198-10
Brand	Aftermarket OEM Replacement
Part Numbers
Part Number	TS198
Reference OEM Number	Y70118510
Other OEM Numbers	Y70118510, KL011851X, JE151851X, B5411851X
Related Part Numbers	CTS110, TS198, TTS004
Product Specifics
Product Type	SENSOR
Sensor Type	COOLANT TEMPERATURE GAUGE SENDER
Type	Sensor
Features	Direct Fit
Manufacturer Warranty	1 Year
Thread Size	1/8 GAS
Spanner Size	12mm
Number of pins	1 -pin connector
Connector Shape	Round
Fitting Depth	20 mm
Housing Colour	Black
Plug Type	Blade Terminal
Other Details
Note	Always verify fitment using your vehicle's OEM part number.
Unit Of Measure	ea