Check Eng Light (P0133) "O2 Sensor Circuit Slow Response"

[Mojo72]

The ScanGaugeII translated the Check Eng Light into a Code P0133 = O2 Sensor Circuit Slow Response (Bank 1 Sensor 1). Does the Bank 1, Sensor 1 mean the pre-catalytic converter or the post-catalytic converter sensor? My Vibe is a 2004 w/ 78,900+ miles and I'm sure that the original owner never replaced either of the two oxygen sensors.Should I be seriously thinking of a replacement or do you think the P0133 resulted from a momentary condition that may not repeat itself? I cleared the fault 3 days ago and it hasn't repeated yet.

[Raven]

Bank 1 sensor 1 is the first sensor in the exhaust manifold. I'd wait and see if the code returns. With your mileage it's a little soon for an O2 sensor to fail but it may be getting lazy and is on it's way out.

[Mojo72]

I've read in some other GenVibe oxygen sensor related threads that there have been problems w/ the Bosch brand universal sensors. What do you think of the BWD, Niehoff, or Walker oxygen sensors?