Hi all, I have a question about the severity of a check engine cody that has been coming up on my 2002 Nissan Xterra. It is currently giving an error code that states P1148. When I googled it, it stated the following: “The Diagnostic Trouble Code (DTC) will set when the closed-loop control functio…

You try to fix 1 thing then another issue pops up.

The code indicates the heated O2 sensor is not function. Causing the computer to remain in the open loop mode. So the computer is going to operate the engine as if it never reached operating temperature. The most likely cause for this code is a failed heated O2 sensor for bank 1. Tester

I think that is the story of my life with cars. It seems like it’s only a matter of time before your next car bill.

Thanks Tester. Do you know if you can drive for a few months without it causing further damage? A lot of what I’ve read just states you lose fuel economy. Also, do you know if an oxygen sensor is very difficult to fix on my own?

[image] GMan88: Do you know if you can drive for a few months without it causing further damage? A lot of what I’ve read just states you lose fuel economy. Also, do you know if an oxygen sensor is very difficult to fix on my own? If you own a floor jack, a set of decent jack stands (or some e…

Here’s where the O2 sensor is located. [image] and here’s the tool required to replace it. [image] Tester

Thanks bcohen2010 for this insight. Super helpful and I very much appreciate it.

Thank you so much Tester. You really helped me out a lot!!!

So I looked into the 02 sensor part on Rockauto.com and I found options from $20-$47 per unit. I don’t really know if theres much difference in the quality of these units. I also saw that in the specifications of some of these models it said something like “upstream left or downstream right” could y…

The code indicated that O2 sensor is sensor 1/bank 1. Bank 1 is the exhaust manifold on the same side as cylinder 1. [image] So that means bank 1 is the passenger side of the engine, and sensor 1 is on that manifold. Tester

Error Code P1148 on 2002 Nissan Xterra

Maintenance/Repairs

Cougar October 3, 2020, 5:54pm 12

The upstream O2 sensor is located in the exhaust pipe ahead of the CAT. The downstream sensor is in the exhaust after the CAT.

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Error Code P1148 on 2002 Nissan Xterra

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