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DIY: B7 Audi A4 2.0T FWD Coolant Temp Sensor (CTS)

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DIY: B7 Audi A4 2.0T FWD Coolant Temp Sensor (CTS)

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  #11  
Old 01-11-2017, 02:32 PM
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Join Date: Jan 2017
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I changed my cts today. It probably took 30 minutes and involved me breaking one clip so thanks for the tip to save the old one! I reckon about 3-400ml of coolant drained when I took the plug out. The old O-ring didn't come away with the plug but retrieving it was nothing at all.

The only thing I couldn't be certain of was that I'd seated it properly. It felt right, the clip went on but there's no reassuring 'click' like you'd get with other components. I did get 2 codes; p0118 and p2181, which I looked up and hope will clear after I've done a few miles.

Thanks again for the above guide, it is incredibly helpful.
 
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  #12  
Old 07-24-2017, 03:02 AM
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Join Date: Jul 2017
Posts: 5
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Originally Posted by Vic Flange View Post
I changed my cts today. It probably took 30 minutes and involved me breaking one clip so thanks for the tip to save the old one! I reckon about 3-400ml of coolant drained when I took the plug out. The old O-ring didn't come away with the plug but retrieving it was nothing at all.

The only thing I couldn't be certain of was that I'd seated it properly. It felt right, the clip went on but there's no reassuring 'click' like you'd get with other components. I did get 2 codes; p0118 and p2181, which I looked up and hope will clear after I've done a few miles.

Thanks again for the above guide, it is incredibly helpful.

how did it go? I have a p0118..gonna order the cts..just wondering if it's easier on the ramps as this is my first dyi job.
 
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  #13  
Old 11-08-2018, 11:29 AM
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Join Date: Nov 2018
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Originally Posted by MoxUSC View Post
If you're getting a P2181 code its possible you need to replace your CTS. It seems like these things go bad all the time. Here's a cheap and easy DIY:


DIY for B7 Audi A4 2.0T FWD Coolant Temperature Sensor (CTS)

Hereís what you need:

Part # 06A919501A Ė Coolant Temp Sensor (GREY 2 pin)
Part # N90316802 Ė O ring
Part # 032121142 Ė plastic retaining clip
Flat head screw driver
Flashlight
Mirror

Step 1: Wait until the engine is very cold. Youíll be working behind the engine block near the cat and it gets pretty hot. Remove Engine Cover.

Attachment 27743




Step 2: Use a flashlight and mirror to get a visual on the CTS.
Attachment 27744

Attachment 27745

Step 3: Insert a flathead screwdriver into the small opening (indicated by the arrow above) on the electrical connector and gently pry up. Remove electrical connector and move it out of your way.

Step 4: Insert a flathead screwdriver into the small opening (indicated by the arrow above) under the plastic retaining clip and gently pry up. Remove plastic clip and try not to drop it. You may need it as back up later.

Step 5: Gently pull out the old CTS. Some coolant will come out but not too much. Locate and set aside the old O-ring on the top of the sensor. If you canít see it, itís up inside the plastic pipe where the CTS sits. Reach in there and pull it out. You may need it as back up later.

Step 6: Place new O-ring on top side of the new CTS and insert electrical connector into new CTS. Firmly push new CTS into the plastic pipe where the coolant came out. You do this pretty much blind so you have to feel around and make sure the new CTS is seated correctly.

Step 7: Place new plastic retaining clip into clip grooves until it clicks into place. This is somewhat difficult and frustrating because you have to keep the CTS seated correctly while orienting the clip to click into place in the grooves. You do all of this blind. It took me about 20 minutes to finally get it. If you drop the new O-ring or new plastic clip in the process, itís possible it will be tough to find or retrieve from behind the engine block. Obviously you can use the old ones if this happens.

Thatís it!

Thanks for the photos and the explanation! I've tried putting the CTS back in but I'm having trouble.. is the clip supposed to go behind the rubber O-ring? Because when I put it in it doesn't seem to stay in so maybe I'm not pushing it in all the way? Now that I took it out I'm afraid of taking to any shop and idk of any mechanics that can come out to me smh.
 
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  #14  
Old 11-09-2018, 10:08 AM
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Join Date: Feb 2011
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Originally Posted by attaboym3 View Post
Thanks for the photos and the explanation! I've tried putting the CTS back in but I'm having trouble.. is the clip supposed to go behind the rubber O-ring? Because when I put it in it doesn't seem to stay in so maybe I'm not pushing it in all the way? Now that I took it out I'm afraid of taking to any shop and idk of any mechanics that can come out to me smh.
Hard for me to remember all the details as this DIY was about 6-7 years ago, but as I recall:
- it did take me some time to figure out the positioning and location for the O-ring and clip. So, as I found with a lot of Audi DIYs, just takes some patience and perserverence.
- The clip doesn't provide you a satisfying "click" when put back into place. It should fit snugly in the provided "groove", but it won't click or lock into place as is with other components (I believe).
- The clip breaks easily so, unless you have the original or a spare, be careful. If possible, look at the CTS itself, then the groove, then the clip and try to see how they might "best" fit together and snugly. People have mentioned on here that putting the car on ramps and going from underneath might be easier.
- I think the O-ring placement should be fairly evident, should fit inside the opening somehow. Again, have some patience with it. I believe the O-ring is there to provide a better "seating" for the CTS and to prevent some leaks. I'm thinking it should probably "behind" the clip.
- Don't stress too much. Get things back installed as best you can and check under your car for a couple days. No leak - you're good. Leak - try to seat the O-ring/clip again if you can. I don't think you're going to massively ruin the car if this isn't perfectly in place, is all I'm saying.

Good luck!
 
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