showed p1273 code, next day will turn over but not start?

Question

What do I check/replace first? Battery is fine, just replaced alternator, coil packs, plugs and wires, recently had oil and filters changed, replaced radiator. After all this, the engine light came on and showed a p1273 code and I was advised to replace upstream 02 sensor. The next day when I cranked it, it was upper shaky and noisy at first ( but it was a cold start) and when I started driving it was fine. 10 hrs later when I went to leave work, it will turn over but not start.....what do we do next? o2 sensor hasn't been replaced yet

Answer 1

Hi there

This code is usually the result of some other issue with the engine to be honest. Not the sensor itself. The code is basically telling you how the sensor is reacting. The no start could be the result of several things, bur since it was running rough after a cold soak, I would check for a head gasket issue. Here is some more info on this code as well.

P1273 NISSAN - Air Fuel Ratio Sensor 1 Bank 1 Lean Shift Monitoring

Read more: https://www.autocodes.com/p1273_nissan.html