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Old 07-26-2011, 08:58 PM   #1
txl146
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Member#: 32459
Join Date: Feb 2003
Chapter/Region: Tri-State
Location: NY
Vehicle:
02 WRX VF34 (SOLD)
Junior Tuned 301whp

Default DIY: Coolant temperature sensor

Spent an hour replacing coolant temperature sensor.

Tools you need:

- 10mm, 12mm and 19 mm (deep) sockets.
- New coolant temperature sensor (I purchased it from advance auto part for $20). Dealer sells it for $25.




1. Remove the alternator:


Now you can push alternator all the way down and remove the belt



Once you remove bolts/bracket shown above, you should be able to lift and remove the alternator. There is one green connector that needs to be disconnected and 12mm nut on the alternator that needs to be removed.

2. You can now see the coolant temperature sensor:


3. Using 19mm deep socket, remove the sensor after removing the connector. You will lose some coolant so place a towel under the sensor.

4. Sensor removed:


5. Put everything back together and enjoy the car.

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Old 07-28-2011, 01:55 AM   #2
txl146
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Junior Tuned 301whp

Default

One thing I forgot to mention is that you must burp the system and properly top off the coolant.
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Old 07-28-2011, 03:30 AM   #3
oguitar
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Location: Albuquerque NM
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2002 WRX Wagon
Silver

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Did your sensor go out? Or was this more of a preventative maintenance?
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Old 07-28-2011, 03:55 AM   #4
xreaction122
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2004 RSTi
Plasma Blue Pearl

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Thanks for posting this, my CTS **** the bed and I was wondering where this sensor was
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Old 07-28-2011, 12:13 PM   #5
txl146
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Junior Tuned 301whp

Default

I replaced the sensor while troubleshooting for the P0171 code.
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Old 01-31-2013, 01:54 AM   #6
shoemakur
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1997 impreza obs
green/grey

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did you have to drain the coolant?
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Old 02-06-2013, 11:56 PM   #7
gknott
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Thanks for the write up but after I replaced mine and burped the system the engine temp started to run around 204 on idle and show redline on the gauge... Anyone know why?
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Old 02-07-2013, 02:58 PM   #8
BlackedOut04
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You didn't get all the air out.
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Old 06-14-2015, 02:21 PM   #9
Bobbygems
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Did this solve your P0171 code? I've been trying to troubleshoot this code on my 03 wrx for months and I've just ran across this post. Thanks in advance
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Old 06-14-2015, 08:55 PM   #10
Titter
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EJ207 Spec C 4EAT

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Old 06-14-2015, 11:52 PM   #11
Uncle Scotty
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Quote:
Originally Posted by Bobbygems View Post
Did this solve your P0171 code? I've been trying to troubleshoot this code on my 03 wrx for months and I've just ran across this post. Thanks in advance
there are several HUGE threads on the p0171 code

and the answer isn't in bumping old dead threads
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Old 06-16-2015, 12:13 AM   #12
Bobbygems
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I've done extensive research on many threads, including PAWRX's thread on here. Cleaned the old maf, bought new maf, changed front o2 sensor, changed all vacuum lines, new OEM injectors, cleaned iacv, checked my grounds. I found this thread while searching for coolant temp sensor location so i can replace it and Txl146 mentioned he was troubleshooting this code, coincidentally. Since my next steps are to change the map sensor and fuel pump, which are expensive fixes I figured wouldn't hurt to ask.
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Old 06-16-2015, 01:01 AM   #13
Uncle Scotty
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ohjesush****ingchrist
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Old 07-23-2015, 11:28 PM   #14
txl146
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Junior Tuned 301whp

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To answer your question, temp. sensor did not fix P0171 issue.

Turned out that my 2x replacement MAF sensors were bad, which took me two years to figure out.
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Old 12-30-2015, 10:38 AM   #15
ChuckCheeze
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2014 sti
WR Blue

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FYI for EJ25, the oil sensor is in the way to get the 19mm deep socket and ratchet in, so you need a 24mm deep socket to get the oil sensor out and then use the 19mm deep to get the CTS out.

I am replacing the CTS every 18 months, so this is a good reminder for me. =)
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Old 12-30-2015, 08:54 PM   #16
blue wrench
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Quote:
Originally Posted by ChuckCheeze View Post
I am replacing the CTS every 18 months, so this is a good reminder for me. =)
Did you also save a grand total of $5 by using a parts store sensor, so it goes bad every 18 mo.?

jk

Seriously though, why?
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Old 12-30-2015, 09:05 PM   #17
ChuckCheeze
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2014 sti
WR Blue

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I wish it was as simple as store parts, but I have been using OEM 22630AA230.

i traced the wiring harness...resistance is good...thinking it might be a bad ground, but did not find any.

both time has been a long road trip (nj to fl 18 months ago, nj to canada this time), but i have done the nj to canada trip 6 months ago and no problem.

any help or clue would be great because each time it goes bad i get CEL P0118 and i drive in cripple mode on the way home and it is frustrating to see the temp go from -40 to normal and finally dying at -40.
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Old 10-11-2019, 04:08 PM   #18
jacobe38
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black

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will this fix p0117?

this is a code regarding the actual CTS and NOT 171 like OP mentioned.
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