02 Sensor problem- DTC 0131 [Archive] - GrandAmGT.com Forum


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01-25-2006, 11:07 AM
A while back my Service Engine Soon light came on, I plugged in my scanner and is shows code 0131 [02 Sensor Circuit Low Voltage (Bank 1 Sensor 1)].

I took the 02 Sensor out made sure the terminals were clean, bought a new Bosch 02 Sensor, installed the new one and put some di-electric grease on the terminals as well. I erased the trouble code, but then after the car went through its learning cycle (or whatever you call it- drive cycle?).

Then the code came back and has been on ever since. I looked up info on the GM eSI Service CD's I have and it had alot of different things to check, many of which I dont have the equipment to check myself.

Anyone had this problem or have any ideas where to start?

Any help would be great, Thanks!

01-25-2006, 11:33 AM
There are two (2) O2 Sensors. Perhaps you missed the second?

01-25-2006, 06:53 PM
which 02 did you replace??

01-25-2006, 07:39 PM
I replaced the correct one. The one right at the end of the manifold (called upstream I think). Its the important one (to me anyway). As far as I know the downstream one just checks if the converter is doing its job, the upstream one (one I replaced) is the one whos reading are responsible for adjusting the mixture of whatever.

01-25-2006, 08:14 PM
your right that its called upstream. But there both pretty important in determining AF mixture. you might have just gotten a bad new 02 sensor (Ive seen that happen before). Maybe just try another one, and if its not that then you gotta start diggin deeper.

01-25-2006, 10:32 PM
bosch o2 sensors sucks.. stick with OEM ones. Thats ur main problem right there.

01-26-2006, 05:26 PM
we use standard 02's at work. Havent had any problems with them.

01-26-2006, 05:42 PM
Well that sucks, because that damn thing cost like $60.xx if I remember correctly.