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2005 Toyota Echo Temperature Sensor Light

Tiny
SOUDER17
  • MEMBER
  • 2005 TOYOTA ECHO
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 39,985 MILES
Hi, I recently purchased a 2005 Toyota Echo Automatic (in Australia). Two days after purchase I noticed the temperature sensor light comes on when I first start the car indicating the car is running cool (the blue light). It didn't do this for the first few days I owned the car. Anyway, I drive for about 5 minutes and the light switches off. Should I be concerned? Does the car need to be taken to a mechanic? Is there anything I should do? Thanks in advance for any advice/help you may provide. Sincerely, Souder17
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Thursday, September 3rd, 2009 AT 10:30 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
The light is supposed to come on when engine is cold and go off when coolant temp is at operating temp.

Most likely a bad (or going bad) sensor, I would not be concerned, but if you are, hook up PCM to scanner and see what PCM is reading for coolant temp. It should rise to thermostat temp, go down several degrees and then maintain the operating temp (180-195 degrees F).
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Tuesday, December 8th, 2009 AT 5:50 PM

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