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BMW F21 Coolant Temperature Sensor replacement help

Steve77

By Steve77,
in BMW 1 Series Forum

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Steve77 Rookie

Steve77

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Hi guys

I'm hoping someone can help me.  I had a new battery fitted to my 1 series 1.8 Diesel by the AA on Saturday and the guy said it returned an error Coolant Temperature Sensor (pic attached) but said it was an easy fix.  I bought a new sensor but I cannot figure out how to change it and YouTube hasn’t turned up any videos on how to do it.  Can anyone point me in the right direction with how to do it, ideally with a video please?  I’ve found where it is but I can’t figure out how to remove/replace it and don’t want to break anything.  Thank you all.

IMG_7788.jpeg

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Greydog Grand Master

Greydog

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Morning Steve 

Welcome to the Forum

Normally I would use 2 tools a small rubber plug and a 22mm spanner, make sure the engine is cool/cold.

I have a rubber tapered plug (can't even remember where it came from) you can make one from a finger from a rubber glove with paper towel inside. Disconnect the sensor plug and loosen the sensor using the spanner, once loose you can unscrew it by hand. Coolant will leak out so quickly swap the sensor for the plug to minimise loss. I put a piece of towel below to catch the spill. 

Replacement is the reverse of removal when tightening the new sensor with the spanner don't over tighten. Wipe the area clean and check for any leaks remove the towel below check the coolant level and top up if required (Note. If you don't have correct coolant use distilled water not tap water). Run the engine up to temperature and make sure there are no leaks, Job Done 

Dave

 

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Steve77 Rookie

Steve77

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1 hour ago, Greydog said:

Morning Steve 

Welcome to the Forum

Normally I would use 2 tools a small rubber plug and a 22mm spanner, make sure the engine is cool/cold.

I have a rubber tapered plug (can't even remember where it came from) you can make one from a finger from a rubber glove with paper towel inside. Disconnect the sensor plug and loosen the sensor using the spanner, once loose you can unscrew it by hand. Coolant will leak out so quickly swap the sensor for the plug to minimise loss. I put a piece of towel below to catch the spill. 

Replacement is the reverse of removal when tightening the new sensor with the spanner don't over tighten. Wipe the area clean and check for any leaks remove the towel below check the coolant level and top up if required (Note. If you don't have correct coolant use distilled water not tap water). Run the engine up to temperature and make sure there are no leaks, Job Done 

Dave

Morning Dave

thats amazing, thank you so much for your help, really appreciate it.

 

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