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Full Version: Error code 27
6G Celicas Forums > 6th Generation Celica > Engine/Transmission/Maintenance
BryonC17
I had my CEL on and I checked what it was throwing off and it was a 27. It says that it a Sub-Oxygen Sensor signal. Has anyone had this, and what do I actually need to replace or check? Thanks.
fastgt
o2 sensor...umm prolly the one under the car cuz i think our cars have two
rjbibeau
it's the sub sensor on the cat the bottom one towards the ground you'll see it when you pop the hoodie
BryonC17
Thanks for the info. I will check it out.
BryonC17
One more question......would this be the upstream or downstrem?
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