- Dec 4, 2011
- 276
Recently have been getting codes P0130 & P0133 (with an occasional P0171). These occur mostly when traveling at highway speeds, but not exclusively. I replaced both O2 sensors almost 4 years ago, don't remember what brand I used.
I am monitoring the O2 output voltage with my scan gauge and seeing that the upstream sensor output is sometimes not cycling low and high, it will hang in the 400 to 500 mV range. And then it will go back to swinging from around 70mV up to 650+ mV. I'm thinking the upstream sensor is going bad, but I'm not sure how the P0171 works into this.
Any ideas, suggestions?
I am monitoring the O2 output voltage with my scan gauge and seeing that the upstream sensor output is sometimes not cycling low and high, it will hang in the 400 to 500 mV range. And then it will go back to swinging from around 70mV up to 650+ mV. I'm thinking the upstream sensor is going bad, but I'm not sure how the P0171 works into this.
Any ideas, suggestions?
