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p0131 code


ridestreet84
07-10-2005, 01:12 PM
ok i know this may sound stupid for asking this but i have a p0131 code coming up on my ecu i kinda went through a puddle and it happen. The code means the primary heated o2 sensor circuit low voltage.
heres the question is there only one o2 sensor on a 99 civic ex or are there 2? i know that there is one in front of the cat is that the only one?

snowman2005
07-10-2005, 04:23 PM
nope theres 2. 2nd one should be after the cat

ridestreet84
07-11-2005, 08:35 AM
so with that code which one should i replace the one in front of the cat i dont remember seeing one after the cat.

snowman2005
07-11-2005, 10:04 AM
P0131 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit Low Voltage
the first one

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