• Mazda B593-18-840A Genuine Engine Coolant Temperature Sensor
1 5

Mazda

Mazda B593-18-840A Genuine Engine Coolant Temperature Sensor

Mazda B593-18-840A Genuine Engine Coolant Temperature Sensor

$40.11 Sold out
Shipping cost is calculated at checkout. Enter the address to find out the delivery time and cost.

✔ Genuine Mazda B593-18-840A Engine Coolant Temperature Sensor — OEM Part
✔ Fitment: Select Mazda models (1993–2017) including Mazda 2, 3, 6, Protege, MX-6, Millenia, and more
✔ Direct replacement for factory coolant temperature sensor — no modifications required
✔ Manufactured to Mazda’s original specifications
✔ NTC Sensor design — ensures accurate coolant temperature readings for the ECU and gauge
✔ Green housing — matches factory color coding

 

Genuine Mazda B593-18-840A Engine Coolant Temperature Sensor

An inaccurate or non-functioning temperature gauge, engine overheating without warning, radiator fans that do not switch on (or stay on constantly), or a check engine light with coolant temperature codes — these are common signs that your engine coolant temperature sensor is failing. The sensor measures the temperature of the engine coolant and sends this data to the ECU, which uses it to control fuel injection, ignition timing, and radiator fan operation. A faulty sensor can cause poor fuel economy, rough running, and potential engine damage from overheating.

This is a factory-original Mazda engine coolant temperature sensor (OE part number B593-18-840A). It is a 2-pin NTC sensor with a green housing and M12 x 1.5 thread. The sensor comes with a seal ring and is designed for direct installation into the engine block or radiator. This is the same part sold at Mazda dealerships.

When to Replace

• Temperature gauge does not move or reads inaccurately • Engine overheats without warning • Radiator fans do not switch on, or stay on constantly • Check engine light with coolant temperature codes
• Poor fuel economy or rough running

Product Details & Highlights

• ✔ Genuine Mazda OEM — not an aftermarket or Chinese replica
• ✔ NTC Sensor design — accurate temperature measurement for ECU and gauge • ✔ Direct replacement — fits factory mounting location
• ✔ Includes seal ring — ready for installation • ✔ Green housing — matches factory color coding • ✔ Backed by Mazda’s manufacturer warranty (valid through any authorized dealer)

Package Contents

• 1 × Genuine Mazda B593-18-840A engine coolant temperature sensor
• 1 × Seal ring

FAQ

FAQ

Is this a genuine Mazda part or a copy?
This is 100% genuine Mazda OEM — in original factory packaging with the Mazda part number printed on the label. It is not an aftermarket brand or a replica.

Does this fit my 2008 Mazda 3?
Yes — the 2008 Mazda 3 is listed as compatible. We recommend verifying with your VIN.

Does this fit my 2005 Mazda 6?
Yes — the Mazda 6 is listed as compatible. Please verify with your VIN.

Does this sensor come with a seal?
Yes — the sensor includes a seal ring for proper installation.

What is the thread size of this sensor?
The thread size is M12 x 1.5. A 19mm spanner is required for installation.

Can I install this sensor myself?
Yes — it is a direct replacement. However, the cooling system should be drained or the sensor removed quickly to minimize coolant loss. We recommend consulting your vehicle's service manual for the correct procedure.

View full details