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Re: pulled code 1127
P1127 long term fuel trim bank 1 system too rich.
I think you could be right with the O2 sensor. The vehicle should only hestitate at light throttle, but should be okay under acceleration. It may even idle slightly erratically.
I would however, if you have a pulsewidth meter, check the injector pulses, because if the pulsewidths are too short then the O2 sensor is functioning correctly and is actually shortening the pulsewidths in an attempt to counteract an overfuelling scenario, which could be the result of dripping injectors or the like.
As I said earlier, though, I would tend to go along with your O2 sensor fault.
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CO2 levels are set by the ECM program. If the HO2S and O2 sensors are working properly then that information is relayed to the ECM ,checked against the CPU program and the air/fuel mixture/timing is adjusted by the ECM to rectify the readings. Run the fault codes to see if there is a sensor problem
service engine light on Nissan will not damage the car in any manner, however you gas mileage may change slightly. Service engine light can be numerous of issue. Fist I would change the Co2 sensor, 99% that will be the main issue, most people don'trealize that unit need to be replace every 50-75k miles. if that does not solve the issue than take it to the dealership and have them plug it into their computer and it will spit out a code so mechanic can narrow drown on what need replacing. Running bad gas or running low octane can also cause the light to come on. Before you change Co2 sensor, go to Mobile, Shells, Speedway, gas stations and put in 93 or highest octane gas and go to Automotive store and pick up a STP fuel injectors cleaner, mix it with full tank of gas and run it til next refill and see if that light goes off, if not than change Co2 sensor. I believe that truck has 2 sensor if it a V6. the sensor located on the exhaust pipe before catalyst converter. its easy to fix and replace if you have the tools. if you don't know where the sensor looks like or located on the car, just get the new parts and look compare the old to the new. they run somewhere around 35-40 bucks each. Co2 sensor measure amount of burned gas telling the computer if its running rich or lean, if the sensor goes bad the computer get trip and the light comes on. good luck!!
co2 ...or do you mean O2 (Oxygen Sensor). The Oxygen sensor is always located downstream on the exhaust and is typically easily seen from the underside of the car. Start where the engine is and follow the exhaust until you see what looks similar to a spark plug screwed into the side of the exhaust pipe. It always has a wire, or even a few wires attached to it. There may be one and sometimes up to four. Why are you changing it ? If there are several make sure you know which one is defective and that it is indeed defective. They are easy to test with an ohm meter. Sometimes other devices or systems that are not functioning properly cause the computer to record a code that refers to this system. This is a system with many parts, connections and variables...I just want to see you replace what is needed and not what a code may make you think is needed. I hope that makes sense to you. Why did you replace the other items ? I have never seen a cam and crank sensor fail at the same time. Hope to hear back from you soon.