Update:
I was wondering if ths code might of been an upstream or downstream code? Since upstream is like $200 dollars more than the downstream.
Read more: http://engine-codes.com/qa/30349/p1166-this-an-ups...
I was wondering if ths code might of been an upstream or downstream code? Since upstream is like $200 dollars more than the downstream.
Read more: http://engine-codes.com/qa/30349/p1166-this-an-ups...
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P1166 Honda - Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction: Upstream O2 sensor or the wiring. See the included wiring diagram: I'm assumed that your Civic is an A/T:
Check the fuses first:
In the under dash fuse/relay box: Fuse # 9 (15A), #15 (7.5A)
All is good then replace the O2 sensor, upstream or before CAT O2 sensor. A wiring diagram included for your viewing: