Engine has low power?

This sounds like the car is going into limp mode which could be due to a dirty throttle body these guides should help us fix it.

https://www.2carpros.com/articles/reduced-power-limp-mode

and

https://www.2carpros.com/articles/throttle-actuator-service

and

https://www.2carpros.com/articles/engine-has-low-power-output

Please run down these guides and report back.

Hello
Thanks for the donation.

There is a recall on your vehicle which includes a symptom you are encountering. Please talk to your local Nissan dealer about the recall. Give them your VIN to see if your vehicle is covered under warranty. Below is the recall information.

After having the recall fixed, or if this recall does not include your VIN, just reply here and I will follow up with other diagnosis of the issue.

Hope this helps..
Thanks for using 2carpros.com!

Hello diver76

Welcome to 2carpros. Com

Check your spark plugs.

A single fouled spark plug is bad news because it can kill up to 25% of a four cylinder engines power
output. It is like riding a horse with a broken leg. A fouled plug will also cause a big increase in fuel consumption and emissions.
You changed the spark plugs in December, if there are needing to be replaced again, we should find the cause.
Fouling can be a problem if an engine uses oil. Worn valve guide seals and guides can allow oil to be sucked down the guides and into the combustion chamber. A heavy buildup of thick black deposits on the plug and intake valve
would indicate such a problem. Worn or broken rings, or damage to the cylinder wall can also allow oil to enter the combustion chamber and form ash deposits on the plugs.
If your engine is not using lot of oil then the cause must be something else.
Extensive idling and/or short trip stop and go driving can also lead to a rapid buildup of normal fuel deposits. This occurs because the plugs never get hot enough to burn off the deposits, something which plugs are designed to do or a powdery black deposits on the plugs can occur from "carbon fouling." The underlying cause here is a rich fuel mixture. The problem might be a leaky injector, or a dead oxygen sensor or coolant sensor that prevents the engine control system from going into closed loop and leaning out the fuel mixture.
If this does not answer your concern or If you have engine code please provide it, if no code let me know

Hello diver76

Thank you for providing more information.

The code P0128 means that the engine's
PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.
Depending on the nature of the fault, the lamp may come on and go off, remain on continuously or flash. Some types of intermittent faults will make the lamp come on only while the fault is occurring. When the fault goes away, the lamp goes off. Other types of problems will turn the light on, and it will remain on until the fault is diagnosed and repaired.
Here is the list of things to check:

Verify coolant strength & level
Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
If the above items check out good, replace the thermostat
Your vehicle is a Nissan The ECM may need to be reprogrammed to correct the P0128 code.

Hello diver76

if timing chain is lose, you will hear some ticking, rattling noise while engine is running.
Loss of engine power have something to do with the code p0128.
Dealer knows what noise is for which defective part.
He may be right, or he may be wrong.
Anything about replacing timing chain comes as a sett.
That involves replacing other parts that work together with the defective part just to do a good job.
The loss of power have something to do with the code p0128, remember that. Lose timing chain will make some noise.
If you hear ticking, rattling noise than the dealer maybe right. The dealer may be right also if timing may get bad in the nearest future or base on" timing chain should be replace every 100.000 miles as preventive maintenance", then it does not solve the problem for which the engine is losing power.
That should be optional not because there is 140.000 on your vehicle.

I gave you a list of sensors to check. You should also contact your dealer about reprogramming the computer.
There was TSB about reprogramming the pcm when the code p0128 is shown for Nissan
you can do this as last result.
Before that, did you check the thermostat? The IAT?
Check those and get back to the dealer.

Good morning,

This could be from a clogged catalytic converter. You can get a back pressure gauge at a parts store and insert it where the O2 sensor is located. It will measure the back pressure. Anything above 1.2 pounds indicates the catalytic converter is clogged and the catalytic converter needs to be replaced.

https://www.2carpros.com/articles/engine-has-low-power-output

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

https://www.2carpros.com/articles/catalytic-converter-replacement

Roy

I doubt it at all.

You could check the voltage at the battery with it running but I doubt voltage has any effect on this. If it did, you would have starting issues which you have not indicated.

Roy

What is the voltage? Can you give me the number?

I still think you need to check the catalytic converter.

Roy