p1273 After Replacing O2 Sensor? - Second Generation Nissan Xterra Forums (2005+)
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Old 02-24-2013, 12:26 AM
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Default p1273 After Replacing O2 Sensor?

Has anyone else gotten this code? I just replaced my drivers side pre cat because of p0430 and the code didnt go away, so i replaced the upstream o2sensor with the bosch o2 sensor from rock auto and the p0430 eent away but p1273 started. I reset the ecm with removing the maf sensor and resetting the codes, but p1273 comes back. This time after almost 150 miles. Anybody have any ideas.? Im at my breaking point now.
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Old 02-27-2013, 12:47 PM
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bump - anyone? I was able to get past inspection, but it seems to come on right around 150miles.
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Old 03-01-2013, 07:50 PM
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Do you have a scanner that has live data stream to watch the up stream sensors ? Thats your best route . You need to watch both banks fuel trims long and short and also o2 voltages . They should be switching from .02-.08 constant . If you have a vack leak on that bank ( lean condition ) the voltage will stay low and the fuel trim will be high . They set lean codes when the fuel trim get up around 20% + . . Also fuel inj pulse will show difference between banks.. these do.have a plastic intake that can and do leak . Best way to check is with scanner and carb cleaner sparying around the intake where it meets the lower itake watching the sensor readings.
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Old 03-12-2013, 01:17 PM
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ran the scanner and got this:



i posted a new thread asking about tid/cid values. I'm wondering why the new o2 is reading .6v???
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Old 03-12-2013, 01:29 PM
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also fuel triim values

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Old 03-12-2013, 10:57 PM
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i am no expert in auto electronics.... but my electric guy told me not to buy anything other then nissan o2 sensors... that sometimes japanese cars will not take anything other then oem sensors....
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Old 03-12-2013, 11:54 PM
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You have something goin on with that cat on bnk2 compared to bnk1. You can see it switching faster then bnk1 and thats a sign the cat is no good. This is how i like to diag cats by graphing them side by side. What else info does this show ? Injector pulse sec , timing per bank ? Something is going on with that bank..

Last edited by Rooney; 03-13-2013 at 12:09 AM.
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Old 03-13-2013, 02:05 PM
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so looks like i pulled a major brain fart, 1273 is bank 1, not 2, so i replaced bank 1's o2 sensor with the bosch i thought was bad. i reset the values and have driven about 80 miles. no codes so far but here's what my graph looks like now. Also you can only get the timing advance. it's not possible to do it per bank. and no on the injector pulse sec.
here's the graph:



here's the fuel trim:



and here's the original spreadsheet it came from. this was over about 15 min

https://dl.dropbox.com/u/8308297/tra..._12-08-16.xlsx

Last edited by marty22877; 03-13-2013 at 03:17 PM.
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Old 03-13-2013, 03:16 PM
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also, if i hit the accelerator the bank 1 o2 sensors respond



fuel trim:


Last edited by marty22877; 03-13-2013 at 03:19 PM.
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Old 03-13-2013, 03:19 PM
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Someone else on here had issues with Bosch O2 sensors. If you google it you'll see others having issues with these in their nissans. The Bosch sensors read slower than the OEM ones and that causes all sorts of weird issues. You have to use Denso O2 sensors.
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