Q: After oxygen sensor replacement I'm getting a P1273 error. The engine starts up but won't stay on and stalls.

asked by on

So my Sentra was working fine, but I received an error code to change the sensor 1 bank 1 oxygen sensor, which I did. Afterward, it would successfully turn on, but wouldn't stay on. However, it would stay on if I gave it a little bit of gas for a second or two. Also, when stopped at a stoplight the RPM would drop to about 500 and shake a little bit, but then correct itself to ~700.

According to autocodes.com I needed to perform the ECM Mixture Ratio Self-Learning clearing procedure found here: http://nissanhelp.com/diy/sentra/projects/nissan_sentra_clear_self_learning.php

I've done this procedure twice (including clearing the error codes afterward), but it still hasn't fixed the issue and the P1273 code returns. As I've mentioned, the car had no issues before the o2 sensor replacement, and I haven't done anything else to the car. Is there something else I need to reset/recalibrate? Other diagnostic tests I can run?

Thank you in advance.

My car has 170000 miles.
My car has an automatic transmission.

Hi there. For the code P1273 to show up on your Nissan, there is either an issue with the fuel system or the air intake control system. Check the fuel pressure on the fuel rail and see if there is at least 55 psi. If the fuel pressure is low, then there could be an issue with the fuel pressure regulator, a clogged fuel filter, or the fuel pump not running at full capacity. If there is good fuel pressure at all times, then check the Mass Air Flow sensor (MAF) and see if it’s dirty. Also, check all of the clamps that connect to the MAF and the plumbing from the MAF to the throttle body. A leak in the intake plumbing will cause the P1273 code to come on as well. This is a symptom of the engine being too lean in the air to fuel mixture. So either there is not enough fuel or too much air. If you need further assistance with your engine stalling, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. After oxygen sensor replacement I'm getting a P1273 error. The engine starts up but won't stay on and stalls.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car stalls and my injectors stop spraying 1998 Nissan Sentra

Hello. If your car is stalling and it stops spraying fuel then most of the time this is caused by a failure in the crank position sensor. This is a common issue on this vehicle. When it fails the computer...

Q: Gear linkage

This will have to be inspected and diagnosed first hand to resolve as it is not clear exactly why the problem exists and the relevant sections of the Factory Service Manual are several pages long, too long to reproduce here....

Q: Cruise control shut off when I was traveling down the highway. Now it won't turn on.

Hi, thanks for writing in. In most cases, the issue you're describing is caused by a problem with either the cruise control brake switch (on an automatic transmission like your Durango) or the cruise control switch on the steering wheel...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.