BMW 745Li Coolant Temperature Switch (Sensor) Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(35)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(35)

Coolant Temperature Switch (Sensor) Replacement Service

How much does a Coolant Temperature Switch (Sensor) Replacement cost?

On average, the cost for a BMW 745Li Coolant Temperature Switch (Sensor) Replacement is $124 with $29 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2005 BMW 745LiV8-4.4LService typeCoolant Temperature Switch (Sensor) ReplacementEstimate$172.89Shop/Dealer Price$204.87 - $261.42
2003 BMW 745LiV8-4.4LService typeCoolant Temperature Switch (Sensor) ReplacementEstimate$152.89Shop/Dealer Price$184.90 - $241.47
2002 BMW 745LiV8-4.4LService typeCoolant Temperature Switch (Sensor) ReplacementEstimate$152.89Shop/Dealer Price$184.90 - $241.47
2004 BMW 745LiV8-4.4LService typeCoolant Temperature Switch (Sensor) ReplacementEstimate$152.89Shop/Dealer Price$184.86 - $241.40
Show example BMW 745Li Coolant Temperature Switch (Sensor) Replacement prices

What is the Coolant Temperature Switch (Sensor) all about?

The coolant temperature switch, also called the coolant temperature sensor, is a switch that reads the engine coolant temperature and sends a signal to the engine control module, or ECM, to control other functions of engine operation such as the air-fuel ratio.

It is also called a switch because on some cars, it is used to turn on the engine cooling fan at a specific temperature. This aids in the engine warm-up process as well as keeping the engine at a safe operating temperature.

Keep in mind:

  • The coolant temperature switch is a crucial part of the cooling system. If faulty, it can cause severe internal engine damage due to overheating, incorrect air-fuel ratio, or incorrect ignition timing. It can also cause shorter life to the cooling fan motor or other electrical components of the cooling system.
  • Some vehicles are equipped with a separate sensor to display the engine temperature to the driver via the temperature gauge.

How it's done:

  • The Coolant Temperature Switch is verified that it needs to be replaced. The coolant is drained until the switch is exposed.

  • The defective Coolant Temperature Switch is removed by disconnecting the connector and removing it from the manifold.

  • The new Coolant Temperature Switch is installed into the mounting hole in the manifold and the electrical connector is reconnected. The coolant is then refilled.

  • The Coolant Temperature Switch is tested for operation, codes cleared, and retested to ensure all codes have been resolved.

  • The vehicle is road tested to ensure proper operation of the Cooling System.

Our recommendation:

If you suspect that your coolant temperature switch has failed, have one of our licensed mechanics come out immediately to diagnose the problem.

What common symptoms indicate you may need to replace the Coolant Temperature Switch (Sensor)?

  • Check Engine light on
  • Engine overheating
  • Cooling fan runs intermittently
  • Engine misfires, stalls, or idles roughly
  • Erratic coolant temperature

How important is this service?

This part, when faulty, could cause the fan to run intermittently or not at all, which in turns causes overheating or overuse of the cooling fan motor. Whenever overheating occurs, severe engine damage is a possibility.

The engine air-fuel ratio is what keeps it running smoothly. If the ratio gets skewed, the engine will have poor fuel economy and run poorly or not at all. The coolant temperature switch is important because it gives the ECM the information it needs to make this calculation and run the engine optimally. YourMechanic will be able to tell you if this part is performing correctly.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(35)

Rating Summary
34
0
0
1
0
34
0
0
1
0

Joel

15 years of experience
1142 reviews
Joel
15 years of experience
745Li 2005 - Clear fluid is leaking - Jacksonville, FL
Joel seem like the right guy to fix my car

Stephen

20 years of experience
50 reviews
Stephen
20 years of experience
745Li 2004 - Lubricate Trunk - Mount Pleasant, SC
Mr. Moton is a kind & respectful man, punctual, and knowledgeable of all makes & models of vehicles. He is also a distinguished U.S. military veteran. This was our second vehicle service from YourMechanic. Mr. Moton performed an oil change (including oil filter & 3 o-rings), engine coolant temperature sensor replacement, & trunk/steering/etc. lubrication on our BMW 7-series vehicle...the tasks were performed properly and in a timely manner. 'YourMechanic' is a convenient service as the mechanics come to you (home or designated place) to repair your vehicle and the cost of parts, labor, etc. is less than what a dealership, independent repair shop, etc. would charge for the same services + you interact directly with the mechanic performing all work on your vehicle vice a 'go-between' salesperson, 'service representative', 'service manger', etc...who are not the actual mechanics. Dealerships and other repair shops have overhead expenses, such as real estate/rent, utilities (electric, water, gas, etc.), additional employees (managers, sales/service representatives, etc.), parts inventory, heavy/light equipment, tools, etc. and those costs are passed on to the consumer just to keep their operations afloat. The 'YourMechanic' business model removes many of those additional business expenses into a simple online scheduling & service system + the local mechanics, which = lower costs for the consumer and a more personalized/convenient 'house call' vehicle service. Hope this helps...thank you.

Stephen

20 years of experience
50 reviews
Stephen
20 years of experience
745Li 2004 - Lubricate Steering and Suspension - Mount Pleasant, SC
Mr. Moton is a kind & respectful man, punctual, and knowledgeable of all makes & models of vehicles. He is also a distinguished U.S. military veteran. This was our second vehicle service from YourMechanic. Mr. Moton performed an oil change (including oil filter & 3 o-rings), engine coolant temperature sensor replacement, & trunk/steering/etc. lubrication on our BMW 7-series vehicle...the tasks were performed properly and in a timely manner. 'YourMechanic' is a convenient service as the mechanics come to you (home or designated place) to repair your vehicle and the cost of parts, labor, etc. is less than what a dealership, independent repair shop, etc. would charge for the same services + you interact directly with the mechanic performing all work on your vehicle vice a 'go-between' salesperson, 'service representative', 'service manger', etc...who are not the actual mechanics. Dealerships and other repair shops have overhead expenses, such as real estate/rent, utilities (electric, water, gas, etc.), additional employees (managers, sales/service representatives, etc.), parts inventory, heavy/light equipment, tools, etc. and those costs are passed on to the consumer just to keep their operations afloat. The 'YourMechanic' business model removes many of those additional business expenses into a simple online scheduling & service system + the local mechanics, which = lower costs for the consumer and a more personalized/convenient 'house call' vehicle service. Hope this helps...thank you.

Patrick

26 years of experience
1550 reviews
Patrick
26 years of experience
745Li 2004 - Water Pump - Pflugerville, TX
Patrick is by far the first mechanic I have felt was truly there to help

Excellent Rating

(35)

Rating Summary
34
0
0
1
0
34
0
0
1
0
Number of BMW 745Li services completed
385+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1100+
experts on our platform

Recent articles & questions

How Long Does a Lateral Link Last?
In In order for a car to ride and handle like it is supposed to, the suspension system will have to be working properly. There are a variety of different components that are located in a car’s suspension system. While...
How to Replace Wheel Bearings
Wheel bearings are parts that allow the wheels on your vehicle to spin freely and with as little friction as...
What are the Car Pool Rules in Utah?
Utah Utah may be better known for its landscapes and scenic drives (https://www.yourmechanic.com/article/top-10-scenic-drives-in-utah) than its urban areas, but a large percentage of the state’s residents work in Salt Lake City (or other large cities), and rely on Utah’s major freeways...

Engine rumbles and vibrates while idling

You might want to try watching my video "How to Fix a Car That Idles Poorly (https://www.youtube.com/watch?v=eQpPcdvSBks)." You just take the plastic plenum that goes from the air filter to the intake and get some throttle body cleaner. Spray the...

The vehicle lunges in gear

This may be related to a faulty throttle position sensor or potentially a dirty or failing mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement). The mass air flow sensor is a unit in the intake system that monitors air intake as it is...

My car is losing coolant and smoking white

Claimed by Jeff Engstrom

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (844) 997-3624 · hi@yourmechanic.com