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    Which 02 sensor causes the cel?

    My cel is on. Have the P0420 code. Replaced the Bank 1, sensor 1 02 sensor in November. Which 02 sensor causes the cel light to come on? The upstream or the down stream 02 sensor? I bought 4 of the 02 extenders to try to fool the computer. So I can pass emissions testing. Need to know which 02...
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    02 sensor spacers

    I have a 2010 Pro4X Xterra. It didn't pass the emissions test. I checked the scan tool code P0420. The Xterra is running great. I've seen on you tube that you can use Stainless Steel 02 O2 Oxygen Sensor Extension Spacer CEL Fix - M18x1.5. Has anyone done that to their Xterra? I changed out the...
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    Replaced 02 sensor, now code P0171 is showing

    2010 Xterra 156,550 miles on it. I had to replace the Bank 1 Sensor 1 02 sensor. The cel is still after put in the new 02 sensor. So I ran a scan it showed P0171. I haven't drove but around 15 miles to see if the gas mileage went up. It was 8 mpg, now 21 mpg with the new sensor. I don't know...
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