MAZDA OE SH0118840 Engine Coolant Temperature Sensor

( Brand: Mazda Oe ), ( Manufacturer Part Number: SH0118840 ), ( Part Type: Engine Sensor ), ( Product Type: Engine Cooling ), ( Universal Fitment: Direct Replacement ), ( Compatible Model S : 6, Cx-5, Mx-5 Miata, Mx-5, Cx-9, Cx-3, 3, Cx-50, Cx-30, Mx-30 Ev ), ( Product Subtype: Cooling System Switches, Sensors Relays ), ( Department: Oem )

Review MAZDA OE Engine Coolant Temperature Sensor fits 2018–2021

The **Mazda SH0118840 Engine Coolant Temperature Sensor** is a precision-engineered component designed exclusively for Mazda vehicles manufactured between the model years 2018 and 2021, serving as a critical link in the engine s temperature monitoring system. This high-quality sensor, manufactured to Mazda s exacting specifications, plays a vital role in maintaining optimal engine performance, fuel efficiency, and emissions compliance by accurately measuring the temperature of the engine coolant. Positioned within the engine s cooling system, typically near the thermostat housing or intake manifold, the sensor continuously transmits real-time temperature data to the vehicle s Engine Control Module (ECM), enabling precise adjustments to fuel delivery, ignition timing, and idle speed. Constructed from durable materials, including a robust metal housing and a temperature-sensitive thermistor, this sensor ensures reliable operation even under the demanding conditions of high-performance driving or extreme environmental temperatures. Its seamless integration with Mazda s advanced engine management systems guarantees compatibility with a wide range of models, including those equipped with Skyactiv-G or Skyactiv-X engines, where precise temperature control is essential for maximizing power output and minimizing wear. Whether replacing a failed sensor or upgrading for enhanced reliability, the SH0118840 is a direct-fit, OEM-level replacement that restores factory performance and ensures long-term dependability, making it an indispensable part of any Mazda owner s maintenance toolkit.

**Pros and Cons of buying a Mazda SH0118840 Engine Coolant Temperature Sensor (2018 2021 Models)**

1. **Direct Fitment** The SH0118840 is a genuine or high-quality aftermarket replacement designed specifically for Mazda models from 2018 to 2021, ensuring compatibility without modifications.

2. **Reliability** Mazda s engine coolant temperature sensors are known for durability, and this part is built to the same standards, reducing the risk of premature failure.

3. **Easy Installation** The sensor is straightforward to replace, typically requiring only basic tools (socket wrench, anti-seize compound, and possibly a drain pan for coolant).

4. **Prevents Engine Issues** A faulty sensor can lead to inaccurate temperature readings, causing poor fuel efficiency, overheating, or check engine lights. Replacing it resolves these symptoms.

5. **Cost-Effective** Compared to labor costs for professional installation, purchasing and installing the sensor yourself saves money.

6. **Warranty Coverage** Some aftermarket brands offer warranties, while OEM parts may come with manufacturer-backed guarantees, providing peace of mind.

1. **Potential Counterfeit Risk** If purchasing from an untrusted seller, there s a chance of receiving a low-quality or fake part, which could fail quickly or not fit properly.

2. **Coolant Drain Required** Replacing the sensor often necessitates draining some coolant, which adds minor inconvenience unless the vehicle is already low on fluid.

3. **Testing Needed** After installation, the sensor must be tested to confirm it s functioning correctly (e.g., checking for proper resistance or monitoring temperature readings).

4. **Limited Availability** Depending on the region, finding this specific part may require ordering online, which could involve shipping delays.

5. **Skill Dependency** While simple, improper installation (e.g., overtightening or improper sealing) can damage the sensor or surrounding components.

The Mazda SH0118840 engine coolant temperature sensor is a practical and necessary replacement for vehicles experiencing sensor-related issues. Its direct fitment, reliability, and ease of installation outweigh the minor drawbacks, such as potential counterfeit risks or the need for coolant handling. For most DIYers, this is a cost-effective solution to restore proper engine function and prevent long-term damage.

- **Purchase from a reputable seller** (e.g., Amazon, RockAuto, or a local auto parts store with return policies) to avoid counterfeit parts.

- **Follow Mazda s service manual** for precise installation steps, ensuring the sensor is properly seated and sealed.

- **Test the sensor post-installation** by monitoring the temperature gauge or using an OBD-II scanner to confirm the check engine light is cleared and readings are accurate.

- **Consider professional installation** if unsure about handling coolant or electrical connections, especially if the vehicle is under warranty (some warranties void if DIY repairs are performed).

For most owners, replacing the sensor themselves is a manageable task that saves time and money compared to dealer labor costs. If symptoms persist after replacement, further diagnostics (e.g., checking for wiring issues or a failing thermostat) may be necessary.

Details:

They are crafted of the same materials and use technology as parts your vehicle was originally equipped with, so they will provide unsurpassed quality, fit, finish, appearance, corrosion resistance, safety. Engine Coolant Temperature Sensor SH0118840 by Mazda OE. Guaranteed to give you excellent finish, quality, and safety. Whats more, they are the only parts specifically covered by Mazda warranty.

Proven to perform consistently for many years come. Replaces Original OE Part #: SH0118840. Crafted using the most advanced materials and technology. Features: Genuine Mazda OEM part designed to fit your specific model perfectly.

Rigorously tested to meet Mazda factory standards.

part #: sh0118840 prices

• $23.40-$39.49

specifications ocoosys:

• for makes: Mazda
• for years: 2018-2021
• brand: Mazda Oe
• mpn: Sh0118840
• part type: Engine Sensor
• product type: Engine Cooling
• universal fitment: Direct Replacement
• compatible model s : 6, Cx-5, Mx-5 Miata, Mx-5, Cx-9, Cx-3, 3, Cx-50, Cx-30, Mx-30 Ev
• product subtype: Cooling System Switches, Sensors Relays
• department: Oem

seller ocoosys:

• city: Brunswick, Ohio
• rating: 99.6%
• # reviews: 8498

general ocoosys:

• condition: New
• Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components

shipping ocoosys:

• cost: $19.57
• transit: 3-6 Days
• class: Standard
• carrier: FedEx
• type: Calculated
• service: FedEx Ground / FedEx Home Delivery

offer ocoosys:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 3
• started: February 22, 2026

payments ocoosys:

• other
• wallet: Google-pay
• credit card: Visa

returns ocoosys:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

Mazda Oe SH0118840 Is Similar To:

• 10093 Dif Water Neck Adapter Kit For Mazda Miata (15.5% similar) A simple and clean design making it easy to connect water temperature sensors, breather tanks, coolant lines or other uses. Bead blasted surface finish with clear anodized to match surrounding parts. Designed by fr sport-com. Note gasket also available individual package at diff kit comes with a 1/8...(May 23rd, 2018)
• 3 170676277lkq Mazda Aftermarket Intercooler For Speed (26.2% similar) ...(June 15th, 2018)
• 3 Mazda Antifreeze Coolant Overflow Tank Reservoir Bottle Speed (39.7% similar) Antifreeze coolant overflow tank reservoir bottle Mazda 3 Mazda speed 6809 the part listed has been verified to be in good, used condition for year and mileage presented. If an item arrives damaged, please immediately through messaging within at least 24 hours for further instructions. 3l turbo ...(May 10th, 2018)
• 3 Mazda Coolant Overflow Reservoir Bottle Jug (33.6% similar) Left LHS hand section of. Read all item specifics and notes. Important don't rely only upon item title. If an item arrives damaged, please via message within 24 hours for instructions. Right Rh hand MW manual windows pl power locks pm mirror PS steering PW ht bk hatchback netbook notch back SD sedan...(January 20th, 2019)
• 37850 Four Seasons Engine Coolant Temperature Unit Fits Mazda 096361378506 (52.1% similar) So forget the rest and try Best. This part fits vehicles made in the following years 1977 , 1978 , 1979 , our team of certified car quest counter pros are Best biz. You won't be disappointed...(September 20th, 2018)
• 6 Coolant Reservoir Fits Mazda (30.6% similar) ...(November 30th, 2018)
• 802 23073 621 Wd Express Engine Coolant Temperature Seasons Fits Mazda (52.2% similar) ...(February 15th, 2019)
• 802 32007 615 Wd Express Engine Cooling Fan Fits Mazda Protege 884109436805 (32.2% similar) You won't be disappointed. So forget the rest and try Best. 6l 1597CC l4 gas naturally aspirated...(April 17th, 2018)
• 8468 Wd Express Facet Engine Cooling Fan Switch Fits Mazda Mfg (32.3% similar) This part fits vehicles made in the following years 1984 , 1985 . Facet engine cooling fan switch fits Mazda 626 mfg number catalog price is for 1 - adjust qty as needed. PST, Mon to Fri...(May 29th, 2018)
• B593-18-840a Mazda Oem Coolant Temp Sensor For Original Factory (42.7% similar) Used in good working condition...(August 28th, 2018)
• B61p15290 Mazda Miata Coolant Water Pump Bypass Heater Hose Pipe Line (33.6% similar) Most items are shipped via the USPS, or by FedEx in some cases. Some items may be listed with free shipping which is also only for the contiguous 48 states. The return shipping cost is to be paid by buyer unless due an error in offer listing. Domestic shipping: the shipping cost quoted in listing is...(September 27th, 2018)